[aktueel] Vulkaanuitbarsting bij Canarische Eilanden #3

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Recordaantal aardbevingen op Canarisch eiland

Nog nooit eerder werden er zoveel aardbevingen achter elkaar geregistreerd op het kleine vulkanische eilandje El Hierro, het kleinste van de Canarische Eilanden. De reeks van maar liefst 720 bevinkjes heeft de overheid van deze eilandengroep voor de kust van West Afrika ertoe doen besluiten om voor het eerst in de geschiedenis een vergadering bijeen te roepen van het Stuurcomit� van Vulkanische Monitoring. Dit comit� werd opgericht om specifieke plannen te realiseren, die de burgerbevolking dienen te beschermen en noodplannen voor vulkanische risico’s moeten ontwikkelen. Inmiddels wordt gesproken over een ‘significante dreiging van seismische activiteit’.

Het Nationaal Geografisch Instituut (IGN) en het Volcanologische Instituut van de Canarische eilanden blijft nauwlettend de aardbevingen in de gaten houden, waarvan de kracht van de bevingen (elke dag!) ligt tussen de 1 en 3 op de Richterschaal. De meerderheid van de bevingen vindt plaats tussen 5 en 15 km diepte.

Volgens de autoriteiten betekent deze seismische activiteit nog niet direct dat een grotere, significante aardbeving zal plaatsvinden. Het merendeel van de bevingen die zijn geregistreerd, vonden plaats in het Noord Westen van het 280 vierkante kilometer kleine eilandje, bij het plaatsje El Golfo (zie foto hieronder). Een aardbeving op deze plaats zorgde er zo’n 50.000 jaar geleden voor, dat er een enorme landverschuiving plaatsvond, waarbij de helft van de vulkaan in zee gleed. Hierdoor ontstond een ca. 100 meter hoge tsunami die naar de overzijde van de Atlantische oceaan zou zijn gegleden. Schuin tegenover dit eilandje, in het verlengde van de resterende halve kratermond, ligt het Noord Amerikaanse continent..

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El Hierro Earthquake Swarm Enters Third Week
The intensity of earthquakes recorded on the smallest of the Canary Islands, El Hierro, has increased slightly during the last 24 hours. However, the total number of earthquakes recorded daily has lessened since the earthquake swarm initially began on 17 July.

The total number of tremors recorded during the past two weeks has now exceeded 1,050, according to the Instituto Geografico Nacional (IGN).

The majority of the earth tremors ranged between 1-2 magnitude, but during the past 24 hours there have been least five tremors measuring in excess of 2.0 magnitude on the Richter Scale. A 2.4 magnitude earthquake was recorded at 4:56 p.m. local time on Sunday (31 July 2011).

Approximately 50 earth tremors were recorded on Sunday, according to local earthquake monitoring agency Actualidad Volc�nica de Canarias (AVCAN). The number is slightly down on the number of tremors recorded on Saturday and significantly less than the 195 earthquakes recorded on 22 July.

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The vast majority of the tremors have been recorded in the northwest of the 278.5-square-kilometre island at El Golfo, the location of a massive landslide that created a 100-metre high tsunami almost 50,000 years ago.

The earthquake swarm, prompted the Canary Islands Government to convene the first ever meeting on 22 July of the Steering Committee and Volcanic Monitoring, reflected in the Specific Plan Protection Civil and Emergency for Volcanic Risk, given what it described “the significant increase in seismic activity”. The Committee met again on Friday 29 July to discuss the low magnitude seismic activity. It reported that it had stepped up its seismic monitoring operations to identify the source of the earthquakes.

Following an evaluation of seismic and volcanological information gathered by the IGN and volcanological Institute of the Canary Islands, the Committee agreed to activate “monitoring and surveillance mechanisms necessary to coordinate the actions of civilian self-protection and information to people listed in the Plan” (translated from Spanish press release). It remains unclear, however, if the unprecedented seismic activitiy on El Hierro is a precursor to a possible future increase in earthquake or volcanic activity.

Earthquake swarms are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey (USGS) points out that an event may last for days, weeks, or months.

El Hierro’s Volcanic/Seismic Past

El Hierro is situated in the most southwestern extreme of the Canaries. The island was formed after three successive eruptions, and consequent accumulations, the island emerged from the ocean as an imposing triangular pyramid crowned by a volcano more than 2,000 metres high.

The volcanic activity, principally at the convergence of the three ridges, resulted in the continual expansion of the island. A mere 50,000 years ago, as a result of seismic tremors which produced massive landslides, a giant piece of the island cracked off, crashed down into the ocean and scattered along the seabed. This landslide of more than 300km3 gave rise to the impressive amphitheatre of the El Golfo valley and at the same time caused a tsunami that most likely rose over 100 metres high and probably reached as far as the American coast.

Nuevas imágenes de la mancha de emisiones volcánicas en la costa de El Hierro

Material piroclástico en superficie tras la erupción de El Hierro. Día 15-10-2011

Imágenes de la erupción el día 17-10-2011 donde se aprecia el foco principal de la misma

Underwater volcano errupting of coast Canary Islands emits toxic gases

Birth of a new vent on November 23

El volcán de La Restinga, El Hierro.

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NOTE AVCAN 343 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 25 November 2011-10:30 h peninsular - seismic-volcanic activity continues with moderate to high seismicity in the Gulf marine area. According to the PEVOLCA have appeared "quite often a type of volcanic signals (LP). Continued significant volcanic tremor signal in the Restinga area, which remains small amplitude oscillations, more unstable and more explosions, possibly hydromagmatic . the magnitude of the earthquakes between 3.1 and 1.5. New quakes 6. earthquakes senses 1. Depths one to 15, and the rest to 20km. the day before yesterday 21. Yesterday 8. Today van 4. A total of 11,807 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

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The truth is that the photos of non-tip / Guardia Civil of the last day November 23, 2011 are beautiful, and one more thing to show us how small is the nucleus of the Restinga, at the foot of a volcanic cone aligned with other more behind and in line with the town, besides the spot next to the town, the thing is close, too much for my taste, so if the picture is very good, is a cover of National Georgraphic so far indicating eruption in el Hierro (Enrique).

Picture of intense volcanic gas discharge by submarine eruptive activity south of the Restinga on the morning of November 23, 2011. Photo: Civil Guard / InVolCan

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Todo se cuadra para la erupci�n en el norte

The great stain that is leaving the volcano on La Restinga overshadowed on Thursday what is happening in the north of El Hierro, where the location of small tremors in the seismicity and the increase in the rate of CO2 targets shallower magma movements.

The seismicity in the north of El Hierro is decreasing to the point that this Thursday there were only three earthquakes, however, and according to the committee of scientific work to the direction of the Civil Protection Plan for Volcanic Risk (Pevolca) have appeared "quite often a type of volcanic signals (lp) in the Stations of the North Coast." These signals volcanic long period (long period) are equivalent to small tremors associated interrupted movement of magma.

The director of the National Geographic Institute (IGN), Mar�a Jos� Blanco, rejected that means full already tremor signal in the north and, therefore, a rash, but admitted that the magma is moving appreciably off the coast . And it does more superficial positions if one looks at it this concatenation of small tremors is linked to a shallower seismicity in recent days in the north, between 15 and 18 kilometers deep.

Furthermore, these two elements adds an increased gas pressure in the magmatic thermal system. The last measurement of the diffuse emission of carbon dioxide (CO2) from the Canary Islands volcanological Institute (Pevolca) on day 20 is around 2,200 tonnes per day (400 tons more than four days before), a value equivalent to 6.34 times the normal average value on the island.

CO2 is the driving force of eruptions, which is why some experts have the feeling that they may be facing an eruptive phase in the north.

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Clouds and transit seismic hypocenters of seismicity to 11/24/2011

Nubes sísmicas de hipocentros y tránsito de la sismicidad al 24-11-2011

Clouds of seismic events and daily traffic of seismicity for seismic-volcanic crisis on the island of El Hierro to 24 November. of 2011

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The diffuse emission of carbon dioxide by the insular volcanic system is already six times the normal average

The diffuse flux measurements of carbon dioxide (CO2) since last July by scientists at the Institute of the Canary Islands volcanological (involcan) at El Hierro reflect an upward trend in their emission into the atmosphere by the volcano island, which is about the 2,200 tons per day. This is a value equivalent to 6.34 times the normal average for the island of El Hierro, which is 345 tons per day.

On the other hand, as reported in a statement, the stain caused by the underwater eruption off the coast of La Restinga has remained widespread in surface and appreciated "some sporadic changes in hue." The sending center has presented a brown color associated with the emission of fine material. On the tremor signal, its amplitude has remained constant and low throughout the day, with some slight increases and no evidence of any second source of tremor . Similarly, with respect to deformation, the results of processing the data obtained with the GPS stations do not reflect any clear trend in the horizontal components other than the regional. Vertically majority view stations and only a collapse of the Gulf seem to point to stability, mainly in the east. Also, the National Geographic Institute (IGN) confirmed the direction of the Civil Protection Plan for Volcanic Risk (Pevolca), that during this eight earthquakes were located Thursday, with only one of them felt by the population, with an intensity of II. Most of these events are located in the Gulf, aligned in the northeast-southwest in the sea at a depth between 15 and 24 kilometers. The more intense, with a magnitude of 2.8 on the Richter scale, had place at 20:54 hours west of La Frontera at a depth of 16 kilometers. In total, since the day July 17, 2011 11 832 earthquakes have been located.

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The evolution curve of the cumulative seismic energy released looks set moderating its rise, releasing less and less energy.

This may be because the system is relaxing or on the contrary it has been re-hitches and a few days ago, since it is still early to rely, as the last time you did this, ended with a 4.6, Will this in the coming days? or else I still relax, releasing less and less energy?

We'll see what happens, but seeing the gases and the deformation does not seem to be relaxed, especially gases (Enrique)
[bron]

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Update 26/11 – 12:42
The best you can do at the moment is staring at our webcam. For minutes in a row, we have seen periods of smoking magma. The smoking magma was first seen by reader Hans-Werner who also captured the image on his screen. Hans-Werner has told us also that the webcam was operated in the right direction when it happened. This is also great news to hear as the webcam operators seem to have learned from past critics.


Update 26/11 11:30
Joke reports that her friend, the La Restinga human webcam, has growing fear that a new evacuation is not far away as the stain is very visible from the village this morning (Ian reported the same in his 09:52 update). She thinks that if the wind eventually changes, La Restinga might be in the center of the storm again.
Update 26/11 11:28
- The volcanic earthquakes have picked up their daily work again. Since 09:21 this morning 4 M+1.5 earthquakes have been listed by IGN, the strongest one being a M 2.7 earthquake NW of Frontera
Update 26/11 09:52 Ian Carson reports :
A lot of stain right to coast at La Restinga but no emission points can be seen by me. I don't think the earlier mention of a closer one was true. Harmonic calm.
Update 26/11 09:43
- 3 earthquakes have occurred since midnight, all of them less than 1.5, the reason why these quakes are not listed in the IGN main list. 2 of these quakes had a depth of 14.8 km
- while looking at the webcam for a longer period a lot of mysteries are showing up. Here are a few of them :
- why can toppling waves almost only be spotted in the stain waters ?
- why do we have sudden color change in parts of the stain ?
Update 26/11 09:05
- the beautiful calm Las Calmas sea enables us this morning to trace the eruption vent. The arrow on the picture below is the location were we expect that the vent is (probably) degassing. About 15 to 30 minutes ago, we have spotted here the source of a white stain. Unfortunetely the Telefonica operators have since zoomed more to the left . The Telefonica operators have since zoomed the image and probable stirring action has to be located at the upper right corner.

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Data Update 26/11 – 23:42
- A lot of action in the sea means mostly a limited number of earthquakes. Today only 8.
- Depth in between 14.8 and 20.3 km
- Medium harmonic tremor with a limited number of bursts

Ian Carson reports from El Hierro :
I went to La Restinga at first light to see any overnight developments - there weren't any - just the usual stain a bit closer to the shore. After an hour and as it was lovely morning, I went sightseeing. I was returning to La Restigna when I got the message of smoking lava stones.
When I arrived there were little 'bombs coming to the surface intermittently. These got more frequent for a while and then only one every 5 mins. After a while the activity again increased, bright Jacuzzi and many stones coming up, generally smaller than the first batch. Stones were visible on the surface. The affected area seemed to be getting larger and the activity seemed quite intense when I had to leave at 17.40. I look forward to first light ! The Ian Carson images are included in the group below. Click on the image to watch the entire group of pictures.

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Data Update 27/11 – 09:14
The activity at the eruption area gets even stronger than before. The webcam operator just zoomed out a little to have a wider scoop. Earthquake-report.com expects more action today. A stronger Jacuzzi and from time to time a swelling geyser type action.

Data Update 27/11 – 08:50
The coast guard boat on the image will have the best pictures. What he does is however very risky as nobody can predict the start of a subaerial phase of the eruption.

Data Update 27/11 – 08:09
- the action which started yesterday by floating smoking stones is continuing this morning, hot pyroclastic material is floating to the surface. Just behind a weak Jacuzzi is formed. All this can be seen on the Telefonica eruption webcam.

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NOTE AVCAN 346 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 26 November 2011-21:30 h peninsular - seismic-volcanic activity continues with moderate to high seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, which is maintained in amplitude with increasing trend (10%) since the last note, with small oscillations and some explosions, possibly hydromagmatic (by the way the pattern has repeated explosions every 3 hours approx). The magnitude of the earthquakes between 2.2 and 1.5. New earthquakes 4. Depths to 17, 19, 19 and 20km. Before yesterday 8. Yesterday 10. Now go 8. A total of 11,821 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

NOTE AVCAN 347 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 27 November 2011-11:15 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, which is maintained in amplitude with the low tendency (5-10%) since the last note, with small oscillations, and more unstable, with some explosions, possibly hydromagmatic (indeed the pattern of repeated explosions every 3h approx). The magnitude of the earthquakes between 2.3 and 1.1. New earthquakes 11. 17 and 20km depth (and two at 2 and 14km and three to 21, 22 and 25km). The day before yesterday 10. Yesterday 9. Today are 10. A total of 11,832 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

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Data Update 28/11 – 10:01 – Ian Carson reports
Just had long chat with scientists. Depth of vent yesterday was imprecise according to the captain. Now the real news, a new scientific ocean survey ship is coming tomorrow to map the area. It will also do work in the north (El Golfo region).

Data Update 28/11 08:33
- Harmonic tremor remained strong all night
- Contrary to yesterday, no smoking stones this morning. We have just watched a time lapsed period since the beginning of daylight and no surface activity has been noticed on the webcam
- Ian Carson reports that the usual stain is visible but no stirring activity
- 3 earthquakes since midnight, the strongest one being a M 2.0
- depths in between 17 and 21 km
- weather outlook for today : beautiful weather today, wind blowing from the east, maximum wave height : 0.6 meter, wind speed : 1 to 2 knots only in other words a perfect day for volcano activity spotting

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@eruptionsblog
New post! Taking a closer look at the mixing magmas erupting from El Hierro in the Canary Islands - a complicated mess: http://www.wired.com/wire(...)-el-hierro-eruption/

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NOTE AVCAN 350 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 28 November 2011-22:30 h peninsular - volcanic seismic activity continues to moderate-high, with seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that has fallen and risen again (down to 30 and up to 15%) since the last note, and with small oscillations, and more unstable (drop to the 20:42 h), with some explosions, possibly hydromagmatic (by the way the pattern has been repeated every 3h explosion approx). The magnitude of the earthquakes between 2.9 and 1.1. New earthquakes 16. Depths between 19 and 21 km (and three to 13, 15 and 17km and another 23km. Before yesterday 9. Yesterday 16. Now go 20. A total of 11,858 earthquakes are located in El Hierro by IGN at 9:00 pm on 19 July 2011 (Enrique).
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I do not know how I will but I think we should agree on a name you can call, if only here, the volcano's so much talk. And if we do it democratically, which seems logical, the volcano located by the team of scientists from the Spanish Institute of Oceanography (IEO) in the South Rift of El Hierro, according to our survey, called Volcano calms. (Fernando)

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El Hierro Volcano Update : 28th November

Scientists from Spains National Geographical Institute (IGN) observing recent activity of the Canary Island of El Hierro have recorded a total of 10 earthquakes over the course of the last 24 Hours (13.00 Sunday - 13.00 Monday GMT).


As with recent days and weeks, the earthquakes were centered around the El Golfo bay area, to the Northwest of Frontera on the northern coast of the island. The recorded magnitudes varied from 1.5 to 2.2 on the richter scale and at depths between 17 - 21kms.


As with the southern coast of the island over recent weeks, an Oceanographic research vessel is due to arrive on the North of the Island to investigate and map the ocean floor in the El Golfo bay and to check for the likelihood of new volcanic vents being created.
Meanwhile, the Las Calmas bay area, off the coast of La Restinga on the south of the island have seen a development with the volcanic eruptions over the weekend. A new vent appears to have opened up 1.8 km from the coast and this has been accompanied with a marked change in the colour of the stain, together with the emission of sulfurous gasses and the production of a number of smouldering volcanic rocks being brought to the surface of the water.

Undersea Volcano Eruptions Caught On Video

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NOTE AVCAN 351 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 29 November 2011-11:45 h peninsular - seismic-volcanic activity continues to moderate-high, with seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that has remained stable since the last note, and small oscillations and explosions, possibly hydromagmatic (by the way the pattern has repeated explosions every 2 hours approx). The magnitude of the earthquakes between 3.0 and 1.5. New quakes 7. Felt earthquakes 1. Depths to 16, 16, 17, 19, 20 and 23km. The day before yesterday 16. Yesterday 23. Today van 4. A total of 11,865 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).


For those who are curious as will the "Devil's staircase" or energy ladder or evolution of the cumulative seismic energy released from 4.6 until today, I leave you there, with the last steps of the earthquakes of yesterday and today at the end. By the way the patterns are 48h, and two at each 6h-12h also (Enrique)

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Decreased daily average depth, though, with only 4 events detected this day 29 half hour ago. The average weight is the result of energy released every event: Summary of the seismicity of day: 11/29/2011

Number of seismic events on the day: 4 at 11:10

Latitude weighted average energy released: 27,771

Average length weighted by energy released: 18,050

Depth-weighted average energy released: 15,416

Seismic energy released during the day: 10723049118099.76563 Joule

Equivalent Magnitude of the day: 3.0126

Average Energy per event day: 2680762279524.941407500 Joule

Average magnitude event of the day: 2,761


[bron]

Ship navigates close to El Hierro active vent

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The INVOLCAN continues to record an increase in the diffuse emission of CO2 by the volcanic system island of El Hierro

The diffuse emission of carbon dioxide (CO2), at present, the volcano island of El Hierro reaches 2398 � 115 tons per day

Since last July, scientists at the Institute of Technology and Renewable Energies (ITER), an agency of the Cabildo of Tenerife, and is now part of volcanological Institute of the Canaries (non-tip) have conducted numerous scientific surveys of diffuse emissions volcanic gases that have materialized over the entire surface of the island of Isla Meridian. To date, the results reflect the record of an upward trend of the diffuse emission of carbon dioxide (CO2) into the atmosphere by the volcano island of El Hierro has reached 2398 � 115 tons per day, an amount equivalent to almost 7 times the normal average value considered for the diffuse emission of carbon dioxide (CO2) in the island of El Hierro (345 tonnes per day).

This increase in the diffuse emission of carbon dioxide (CO2) shows that the pressure of carbon dioxide (CO2) in magmatic-hydrothermal system existing in the island of El Hierro is increasing probably due to magma movement from positions more shallow depth favoring exsolution of carbon dioxide (CO2) dissolved in silicate melts (magma).

The scientific purpose of these campaigns is to investigate spatio-temporal variations of the diffuse emission of carbon dioxide (CO2) into the atmosphere by the volcanic system of El Hierro island since the results thereof can not be obtained through networks permanent instrumental analysis contribute to the evolution of the current eruptive phase is occurring in El Hierro. On the other hand, it is widely accepted that the gases are the driving force of volcanic eruptions and the importance of carbon dioxide (CO2) in volcanic surveillance programs since not only is the second major component of volcanic gases, after steam but its low solubility in molten silicitados (magma) that favors carbon dioxide (CO2) to escape with their ease of volcanic systems in depth.

These scientific surveys have failed to materialize due to MAKAVOL project "Capacity Building of R + D + i + d to contribute to the reduction of volcanic risk in the Macaronesia (MAC/3/C161)" which is being co-funded by the Transnational Cooperation Programme of the European Union Madeira-Canary-Azores (MAC 2007-2013) and the collaboration of the Island Councils of Tenerife and El Hierro.

INVOLCAN is an institution demanded unanimously by the Senate (2005), Parliament of the Canary Islands (2006) and House of Representatives (2009) with the aim of contributing to improving and optimizing the management of volcanic risk in Spain.

Picture Pie
Temporal evolution of the diffuse emission of carbon dioxide (CO2) in the island of El Hierro (red circles) recorded by the Involcan and the daily number of earthquakes located by the National Seismic Network (IGN).

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Update 29/11 – 11:26 UTC
User Martin Rey has traced the ship currently navigating in the stain area
New oceanographic boat on La restinga th "Sarmiento de Gamboa".. 70m, its the BEST oceanographic boat that can be send, i think. It's called a "grand Cientific Instalation" by CSIC, its owner.


Update 29/11 12:18 UTC
It is not official, but due to the many ups and downs along the stain, we are almost sure that the Sarmiento de Gamboa is mapping the sea floor very carefully.
- Todays webcam image is rather complicated with a number of stains. We will need an image from a helicopter to find out whether these are Jacuzzis or patches of earlier emitted material.

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NOTE AVCAN 352 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 29 November 2011-22:00 h peninsular - seismic-volcanic activity continues to moderate-high, with seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that has remained stable since the last note, and small oscillations and explosions, possibly hydromagmatic (by the way the pattern has repeated explosions ever closer, each hours approx). The magnitude of the earthquakes between 2.2 and 1.0. New earthquakes 4. Depths to 15, 16, 18 and 22km. The day before yesterday 16. Yesterday 23. Now go 8. A total of 11,869 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

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The volcano of La Restinga eject large rocks again

The volcano has returned to La Restinga eject large chunks of solidified lava. The focus cameras 24 hours a bubbling area captured from the first morning, however, "were no more than 20 or 30 rocks" that emerged, says a spokeswoman for the National Geographic Institute (IGN), Carmen Lopez .

A IGN researchers did not give time to collect samples because they could not approach the area due to the strong prevailing wind and the rocks sank quickly, its large size. Carmen Lopez and IGN technicians arrived near the eruptive Salvamar aboard and found that washes out "smoking" in the midst of a "much bubbling" by the emission of "greenhouse and very fine and dense material."

The expulsion of solid material lasted less than two hours. At the moment only seen a bubble in the focal zone eruption.

La Restinga, El Hierro 1st December 2011 8:00 am - 9:30 am

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Graphic which aims to present each day as if there had been an earthquake and the earthquake alone would be equivalent to the sum of the rest of earthquakes a day.
This is to compare the energy released (presented as magnitude), with the average depth of daily events, the average magnitude of the events and the number of events have occurred in the day.
To calculate the average depth, it is weighted by the energy released by each event. (JR)

[bron]

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NOTE AVCAN 362 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 04 2011-22:00 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the del Golfo marine area. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude which remained stable since the last, least the last 2 hours starting at 7:50 p.m. or so where it has doubled in intensity by a possible jam in the pipe and swings and more explosions, possibly hydromagmatic. The magnitude of the earthquake only 1.4. New earthquakes 1. Depths at 17km. Before yesterday 5. Yesterday 3. Today van 2. A total of 11,909 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).
[bron]

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The diffuse emission of CO2 by the volcanic system of El Hierro island falls under the INVOLCAN

This downward trend since late November until now arriving at 1560 � 59 tonnes per day

Since last July, scientists at the Institute of Technology and Renewable Energies (ITER), an agency of the Cabildo of Tenerife, and is now part of volcanological Institute of the Canaries (INVOLCAN) have conducted numerous scientific surveys of diffuse emissions volcanic gases that have materialized over the entire surface of the island of Isla Meridian. The results show a downward trend in the diffuse emission of carbon dioxide (CO2) into the atmosphere by the volcano island of El Hierro since late November, when it came to achieving the 2398 � 115 tons per day, up to now been recorded an emission rate of 1,560 � 59 tonnes per day.

This record to the bottom of the diffuse emission of carbon dioxide (CO2) in turn implies that the pressure of carbon dioxide (CO2) in volcanic-magmatic system existing in the hydrothermal-island of El Hierro should not continue to grow as well it might be inferred during the observation period was experiencing an increase in the diffuse emission of carbon dioxide (CO2).

The scientific purpose of these campaigns is to investigate spatio-temporal variations of the diffuse emission of carbon dioxide (CO2) into the atmosphere by the volcanic system of El Hierro island since the results thereof can not be obtained through networks permanent instrumental analysis contribute to the evolution of the current eruptive phase is occurring in El Hierro. On the other hand, it is widely accepted that the gases are the driving force of volcanic eruptions and monitoring of carbon dioxide (CO2) in volcanic surveillance programs is very important because not only is the second major component of volcanic gases after water vapor, but also because of its low solubility in molten silicitados (magma) favoring the carbon dioxide (CO2) to escape with their ease of volcanic systems in depth.

These scientific surveys have failed to materialize due to MAKAVOL project "Capacity Building of R + D + i + d to contribute to the reduction of volcanic risk in the Macaronesia (MAC/3/C161)" which is being co-funded by the Transnational Cooperation Programme of the European Union Madeira-Canary-Azores (MAC 2007-2013) and the collaboration of the Island Councils of Tenerife and El Hierro.

INVOLCAN is an institution demanded unanimously by the Senate (2005), Parliament of the Canary Islands (2006) and House of Representatives (2009) with the aim of contributing to improving and optimizing the management of volcanic risk in Spain.


Picture Pie
Temporal evolution of the diffuse emission of carbon dioxide (CO2) in the island of El Hierro (red circles) recorded by the non-tip and the daily number of earthquakes located by the National Seismic Network (IGN).
[bron]

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The Involcan shows a decrease in the diffuse emission of CO2 by the volcanic system


Scientists at the Institute of Technology and Renewable Energies (ITER), an agency of the Cabildo of Tenerife, and is now part of volcanological Institute of the Canaries (Involcan), indicate a downward trend of the diffuse emission of carbon dioxide (CO2) into the atmosphere by the volcano island of El Hierro since late November, when it came to achieving the 2398 � 115 tons per day, up to now been recorded an emission rate of 1,560 � 59 tonnes per day.
This record to the bottom of the diffuse emission of CO2 in turn implies that the pressure of CO2 in the system magmatic-hydrothermal volcanic-existing in the island "should not continue to grow as well it might be inferred during the period of observation was experiencing an increase in the diffuse emission of CO2. "

The Involcan said in a statement that the purpose of these campaigns is to investigate scientific spatiotemporal variations of the diffuse emission of carbon dioxide into the atmosphere by the volcanic system since the results can not be obtained through permanent instrumental network developments contribute to the analysis of the current eruptive phase is occurring in El Hierro.
[bron]

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Spains National Geological Institute (IGN) Scientists, observing seismic and volcanic activity on the Canary Island of El Hierro have recorded just 2 earthquakes over the course of the last 24 Hours (14.00 hrs Tuesday - 14.00 hrs GMT Wednesday).

Activity has fallen considerably over the last week, with Earthquakes numbering between 2 and 4 per week, compared with an average of 12 per day around one month ago.

As in previous days and weeks, these two Earthquakes took place in and around the El Golfo bay area, off the coast of Frontera to the north of the Island. The Magnitudes recorded registered 1.6 and 1.9 on the richter scale, at depths of 23km and 15km respectively.

Meanwhile, scientists observing the underwater Volcanic eruptions in the Las Calmas bay area, off the coast of La Restinga on the south of the island have told PEVOLCA that the temperature of the sea around the `jacuzzi is beginning to stabilize. Temperatures peaked on the 6th of November with a maximum recording of 30.9 Degrees, but have now returned to an average of 21.3 Degrees.
[bron]

VUELO CIENTÍFICO INVOLCAN - GC 291111 - VOLCÁN SUBMARINO DEL HIERRO - SARMIENTO DE GAMBOA - PANCAM

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NOTE AVCAN 369 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 08 2011-12:00 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, with high amplitude, unstable and some explosions, possibly even at 04:30 h hydromagmatic where under almost minimum and since then tends to rise and become unstable again. Today has been smoldering pyroclastic output from early in the morning. The magnitude of the earthquake only 1.8. New earthquakes 1. Depth to 22 km. Before yesterday 2. Yesterday 2. Today they 1. A total of 11,919 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).
[bron]

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Slightly increase the tremor and the stain of La Restinga

The National Geographic Institute (IGN) has confirmed the Civil Protection Plan for Volcanic Risk (Pevolca) yesterday only two earthquakes were located in the area of the Gulf, northwest of La Frontera, with magnitudes of 1.9 and 1.6 on the Richter scale at a depth of 15 and 17 kilometers respectively. None of them was felt by the population. In total, since the day July 17, 2011 11 926 events have been found.
According to IGN, the level of tremor increased in amplitude around 22:00 hours, at which time there was a greater pulse length. Since then remained stable at a level slightly higher than the beginning of the day. As for the studies of ground deformation during the day yesterday continued the same pattern of distortion of previous days, reflecting stability in the components horizontal and vertical component deflation of all stations in the south and east of the island regard to the stain of La Restinga, it is noteworthy that there was an episodic emission steaming lava fragments, but of much less importance than the previous day . IGN adds that the vessel 'Adhara' Maritime Rescue attempted to collect samples but it was not possible due to the remoteness of the area in the emerging area with clean water surface. The spot had a large area throughout the day.

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NOTE AVCAN 370 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 08 2011-23:00 h peninsular - seismic-volcanic activity continues to moderate. Continue an important sign of volcanic tremor in the Restinga area, with high amplitude, unstable and some explosions, possibly even at 04:30 h hydromagmatic where under almost to a minimum and since then tends to rise and become unstable again, making more consistent in the last hours. Today has been smoldering pyroclastic output from early in the morning. No new earthquakes today at Hierro and vicinity. Before yesterday 2. Yesterday 2. Today they 1. A total of 11,919 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

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NOTE AVCAN 371 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 09 2011-09:00 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that remains slightly higher and slightly unstable and some explosions, possibly hydromagmatic. The magnitude of the earthquakes between 2.0 and 1.8 New earthquakes 2. Depths to 21 and 23km. Before yesterday 2. Yesterday 2. Today they 1. A total of 11,921 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

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Op zaterdag 10 december 2011 13:08 schreef Asphalt het volgende:
In januari ga ik een weekje naar Tenerife, vandaar uit een dagje naar El Hierro met de veerboot.
Genoeg te zien tegen die tijd als ik de post hierboven moet geloven

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Op zaterdag 10 december 2011 16:13 schreef TARAraboemdijee het volgende:

[..]

Hij zegt toch ook dat hij een dagje El Hierro gaat doen?

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NOTE AVCAN 376 - EARTHQUAKE ACTIVITY-VOLCANIC - IRON ISLAND - DECEMBER 11 2011-22:00 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that remains upward (trend in which the last 72 hours and where the intensity has doubled) and presents a growing number explosions, possibly hydromagmatic, every few minutes, a typical strombolian behavior for which establishes a balance between water inlet and outlet of gases in the exhaust duct so that it pulses like a geyser. No new earthquakes located. Before yesterday 2. Yesterday 0. Today is 1. A total of 11,923 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

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Update 12/12 -13:57 UTC
- As we are currently in a submarine eruption phase with hydromagmatic bursts, we have searched and found a scientific study about such action. In 1984 Kenneth H. Wohletz and Robert McQueen from the USA Los Alamas National Laboratory wrote a paper with the title : “Experimental Studies of Hydromagmatic Volcanism“ [PDF]. We encourage people who want to learn more details about the current phenomena, to read (at least some parts) of this article.

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NOTE AVCAN 377 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 12 2011-11:00 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, with a base noise amplitude is maintained upward (trend in which the last 3.5 days and where the intensity has doubled) and ... presents a increasing number of explosions, possibly hydromagmatic every few minutes strombolian typical behavior for which establishes a balance between water inlet and outlet of gases in the exhaust duct so that it pulses like a geyser. No new earthquakes located. Before yesterday 0. Yesterday 1. Now go 0. A total of 11,923 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

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Update 12/12 -14:58 UTC
The amazing NASA Satellite MODIS picture taken at 11:55 UTC this morning (3 hours ago) is showing a cloud column on the exact place of the vent towards the island. Even we do not believe it ! Is must be a coincidence and if not than we have detected the steaming vent waters. The image cannot have been photoshopped as it has been extracted directly from the NASA website (thanks to Julio del Castillo Rivero for sending us the NASA link).

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First day free of eruptions and earthquakes in El Hierro since the summer

FOR the first time since July 17, a whole day has gone by with no eruptions off the island of El Hierro and no earthquakes recorded.
Since the summer, there have been an incredible 11,930 earthquakes on the island.
At its most active, the earth movement led to tremors every five to 10 minutes throughout the day.
Although bubbles were seen on the surface of the water off the coast of La Restinga, no volcanic emissions were observed from the crater under the sea for the first time in nearly five months.
At present, the UK Foreign Office advises against all travel to the La Restinga area of El Hierro as a precaution.

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NOTE AVCAN 378 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 12 2011-22:00 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the del Golfo marine area. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that remains (4 days was higher and more than doubled its intensity), presents numerous explosions, possibly hydromagmatic every few minutes, which establishes a balance between water inlet and outlet of gases in the exhaust duct so that it pulses like a geyser. Stronger remarkable explosion at 14:59 has been felt in the Restinga. No new earthquakes located. Before yesterday 0. Yesterday 1. Now go 0. A total of 11,923 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

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Important Update 14/12 – 08:21
The air analysis station shows some (important ?) changes at 08:00
SO2 NO2 NOX
8:00 12 6 15
7:00 7 2 4
6:00 6 2 3
Update 14/12 – 08:05 UTC
The eruption webcam shows smoking material this morning !
Data Update 14/12 – 07:44 UTC
- At 04:02 UTC an earthquake occurred at a depth of only 2 km ! in the El Golfo bay. Click here to see the map with the epicenter. This may be a totally new development if this happens again. The distance to the coast is approx. 5 km (thats the good news). The earthquake has NOT altered the hydromagmatic explosions in the Las Calmas sea.
- Harmonic tremor is still medium with slightly less bursts, although these bursts remain very powerful.

Very Important Update 14/12 – 06:40 UTC
Julio was not resting before he was certain that the light he recorded wasn’t traced back to the exact location. He superposed two images and scaled them so it would coincide with the port location and position. The effect is amazing. The flashlight really came from the vent and because of the distance it must have been a couple of meters high. Of course it can still be a boat, but we do not believe in that scenario as Julio looked at the other recordings later and NO boat was seen in the area. Julio will check his recordings during the morning hours to find out if new similar events might have occurred. The light must have been meters high based on the distance from the webcam (the webcam was not zoomed at the time)


Hot glowing material seen just before midnight ??
Julio del Castillo Vivero surprised us by uploading a short video recorded just before midnight
The video is showing after 11 seconds some object lighting up in the sea and a couple of seconds later another one lighting up. Is it a boat ?? We don’t think so, especially the second object shows a light which is extinguishing smoothly.
And the glowing material make sense if we see the very powerful burst just before midnight (graph below the video)

La Restinga, El Hierro 23:53 GMT/UTC Unknown light source at sea

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NOTE AVCAN 380 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 13 2011-22:15 h peninsular - seismic-volcanic activity continues to moderate, without seismicity localized, but with some weak event (03:08, 03:26, 07: 34 and 11:08 h). Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that has gone up in the last hours, presents numerous explosions, possibly hydromagmatic every few minutes, which establishes a balance between water inlet and the output of gases in the exhaust duct so that it pulses like a geyser. What seems is that they are closer together. No new earthquakes located. Before yesterday 0. Yesterday 1. Now go 0. A total of 11,923 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique).

Today, a curiositie is the spectrogram of la Palma a compendium of human activities and some echo of the swarm Herro. Aircraft and works, but mostly works, working hours and stop for lunch .. is amazing and we so about a month .. so nobody worry if you see the throngs of the sensor signals that blew up ...

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NOTE AVCAN 381 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 14 2011-11:00 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the Gulf marine area. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that has gone up in the last hours, presents numerous explosions, possibly hydromagmatic every few minutes, which establishes a balance between water inlet and the output of gases in the exhaust duct so that it pulses like a geyser. What seems is that more often alternating with periods of peridos less, but more intense. The magnitude of the earthquake only 1.9. New earthquakes 1. 2km depth. Before yesterday 0. Yesterday 0. Today they 1. A total of 11,924 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011 (Enrique)

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You will shortly see the light of volcanological Institute initiative de Canarias (INVOLCAN) and the Cabildo Insular de El Hierro with co-sponsorship of Civic Banking CajaCanarias in order to provide a bit more on the task of helping the community Herre�o in these difficult times. This is a 29x29cm calendar with some snapshots of the underwater eruption south of La Restinga selflessly ceded by members of INVOLCAN and the Helicopter Unit of the Guardia Civil in the Canaries. With a circulation of 10,000 copies and a price of 10 euros / unit, 50% of the profits will go entirely to the community El Hierro, while the other 50% will go to the implementation of educational and training programs on volcanic phenomena volcanic risk management in the Canaries. If you want to collaborate and buy the calendar you can write an email to calendarioelhierro2012@gmail.com. The price does not include shipping.
[bron]

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From AVCAN want to support the maximum dissemination of this initiative as it says aims to provide some help to the community of El Hierro in these difficult times. A charity calendar. Who among us did not want some of those snapshots to save for the future? It's time once again to remember our friends in El Hierro. We applaud the initiative. You can order it on calendarioelhierro2012@gmail.com for only 10 euros. (Fernando)
[bron]

El Hierro Time lapse 17:10

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Update 14/12 19:28 UTC
Thise people wanting to see the hot stones rising up to the Las Calmas sea, please take a look at the La Restinga village webcam. Enjoy the volcano at night ! Thanks to Robert Sommerville for attracting our attention to it.

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Op woensdag 14 december 2011 20:57 schreef Tokamak het volgende:

[..]

Nouja, niet alleen rood. Ik zie ook blauw, groen, geel, paars en oranje voorbij komen

SPOILER

Om spoilers te kunnen lezen moet je zijn ingelogd. Je moet je daarvoor eerst gratis Registreren. Ook kun je spoilers niet lezen als je een ban hebt.

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15/12/2011 @ 09:01 – The IGN has confirmed the stabilisation of the underwater eruptive process in shallow waters to the south of La Restinga as there is a marked decrease in seismicity, reaching the lowest values ​​since the eruptive process began on 10th October 2011. They have said that in the current situation is not considered necessary to maintain constant 24 hour surveillance. It will continue monitoring the activity and its assessment in terms of scenarios, and the issuance of periodic reports and decision making.

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Update 15/12 – 08:04 UTC
PEVOLCA will stop its 24 hours surveillance in La Restinga but the Center for Permanent Care (CAP) will stay open at La Restinga from 08:00 until 20:00 daily. In between 20:00 and 08:00, people will have the possibility to call a guard able to give answers to most questions or urgencies. Pevolca (based on the data delivered from IGN) says that there is NO indication the the process is deteriorating or is becoming more dangerous. IGN reported the eruption process to be stabilized.
Pevolca also said that if whatever new indication of a reactivation will be noticed, they will return to 24 hour surveillance instantly. The decision has no influence on the alert levels currently in place at the Island (yellow alert at the entire island and red alert in a radius around the Las Calmas sea vent).
Earthquake-Report.com who follows the eruption process from the very beginning confirms that the IGN prognosis have always been right until now, although it was often criticized. The alerts were initially called for the landslide risks and the weak to moderate earthquakes in the El Golfo and Puerto Naos areas and as it was not sure in which area the volcano would show up (since the beginning of the eruption on October 10, there were never other vents localized except the line of the current vent (multiple vents at the beginning of November along the Naos coast). (source Joke Volta and the local press)

Data Update 15/12 – 07:59 UTC
- NO earthquakes since midnight
- very strong rise in general harmonic tremor at 01:21 UTC tonight. 40 minutes later back to medium. Bursts as intensive and as much as yesterday. Longest bursts lasted almost 10 minutes
- vent outlet is very defined this morning due to the strong westerly current
- IGN said yesterday that some bursts of harmonic tremor are being felt by local people in La Restinga
- stain as usual

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The nightly burning boat the final word of a volcanologist
Hmmm. I have carefully watched the videos of the strange lights recorded by the web cams on the evening of 14 December, and I am more than ever convinced that they are absolutely NOT related to volcanic activity, take a volcanologists word for it. The way the lights are moving from about 02:30 min in the second (shorter) of the night videos is clearly indicative of a ship. Theres no way in the physical word that incandescent rock will remain persistently incandescent when its in the middle of water, any piece of incandescent rock would be chilled and lose its incandescence at least on the surface.
Boris Behncke from the INGV-Osservatorio Etneo, Catania
[bron]

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Update 15/12 – 08:04 UTC – Why a ship ?
- As you all know IGN almost immediately said that is was a boat. The reason why will be explained a little later in an interview we will publish from Joke Volta with Carmen Lopez, chief scientist of IGN at El Hierro.
- People of El Pinar went to the viewpoint and said also “it is ‘probably’ a boat“.
- Joke talked to a number of people and they said that they had seen a boat at the Lighthouse horizon of the Las Calmas sea.
- Next, Joke looked with her binoculars from El Pinar high above the sea and could see some lights at the horizon.
As Joke knows the location of the vent very well, she was more or less convinced that it could not have been the vent but what else than a boat. The location of the webcams is totally different as they are installed on a hill near La Restinga. We @ ER started looking into to real time navigation maps, but we could not detect a ship to the south of El Hierro.
- This morning she saw this boat again and she started looking in the internet for the name and position. She made a picture this morning and indicated the different positions she saw it (see image below).
- Paul, a ER reader traced the boat this morning on Marinetraffic.com and on http://www.localizatodo.com . The ship was recognized as the C-Whale (see picture below). Paul also said that the only reason we have not seen this ship on the map during the evening and nightly hours must have been that it had switched off his transponders. Why ? Why was it hanging around in that area ? What was he burning ? It does not look like they had a barbecue on board. Nobody knows.
All other questions (easy to come up with more than 5 immediately) will never be solved.
Once again thanks to all for cooperating on this issue. This story has now been finalized.

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Data Update 15/12 15:30 UTC
- NO earthquakes since midnight below or around El Hierro
- OGN has a 1.7 earthquake listed, but the epicenter is located in between Tenerife and Gran Canaria, nothing exceptional
- People living at the Canary Islands looking regularly on the islands seismographs might see the signals of the M 6.3 earthquake at the Kermadec Island (Pacific Ocean) showing up on the seismogram (after 10:10 UTC).
- at 15:40 UTC the vent surface waters showed renew Champagne activity (lot of bubbles)
- harmonic tremor continues to be above medium with regular powerful hydromagmatic bursts (they are sometimes felt in La Restinga)

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Something has changed in the Tremor, but for over an hour no explosions hydromagmatic, Will has taken pressure and keeps out the water in the canal?, The truth is that it has changed their behavior and the explosions have stopped a while. I still no explosions or resume after a while .. see (Enrique)
[bron]

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Data Update 15/12 23:21 UTC
No more earthquakes and a collapse of harmonic tremor at approx. 18:00. The subsiding process started at 13:00 UTC when we saw a period of limited less energized bursts (could be seen on the webcam). It picked up a little bit in the late afternoon to subside almost to 0 around 20:15. At 20:40 we had a new (limited burst) lasting 8 minutes and since then the signal has been stabilized. Another indication of subsiding activity is the lack of bursts during the last several hours.
In a short interview Joke Volta had with Carmen Lopez from IGN earlier today, Mrs. Lopez reiterated that the decision of delegating the nightly surveillance to Madrid had been taken because seismicity (earthquakes) had almost completely stopped and because harmonic tremor was more or less stabilized. The current data analysis showed a stabilization or even subsiding eruption. As far as the signals are this evening the volcano seems to obey and the eruption has drastically subsided.
It might have been a collapse of the vent, as it occurred a number of other times, but during the past processes the earthquakes picked up soon after the collapse. As there is still a remaining signal at the moment the eruption is continuing at a far lower almost survival level (Christmas and New Year holidays vacation ?).
The following hours and days will be decisive for this eruption. If enough magma pressure is left to reopen the vent the activity may increase again. (to be followed)

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Update 15/12 23:55 UTC
One of the people posting a comment in Shipspotting.com, a specialized shipping blog had the following comment on the hanging around location of the C Whale last night :
the most likely scenario is awaiting orders. The tanker market is very poor at the moment and has been for several months. Its certainly not unusual in such circumstances for ships to hang around in the same area doing nothing for weeks, sometimes months on end. The area around the Canary islands is geographically important in this respect as its on the junction of major seaways and means that vessels can go East or West easily should orders come in

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NOTE AVCAN 384 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 15 2011-22:00 h peninsular - seismic-volcanic activity continues to moderate, without seismicity located in the Hierro, but with some weaknesses detected event (18:47, 19: 05 and 11:08 h). Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that was still rising, and is now down and much in the latest hours. In addition, numerous explosions, possibly hydromagmatic, who introduced every few minutes, have stopped at about 13:20 h. At 18:00 h starts to decrease drastically the tremor signal. No new earthquakes located. Before yesterday 0. Yesterday 1. Now go 0. A total of 11,932 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011. (Enrique)

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Data Update 16/12 09:18 UTC
- NO earthquakes since midnight (the latest El Hierro related earthquake occurred on December 14 at 04:02)
- Harmonic tremor gradually picked up since it collapsed yesterday. At this moment it has reached again what we called the main medium tremor from the last couple of days (filled up blue graph). The biggest change is however that the burst are gone, in other words hydromagmatic activity is minor to none.
- The stain is still visible on the eruption webcam in a very windy Las Calmas sea. The active stirring vent cannot be seen anymore.
- Harmonic tremor is still to unstable to allow a prediction of what to come. Will it stop or reactivate ? We will keep you updated.

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Each Wednesday the Volcanological Institute of Canaries will release a weekly graphical informative report about the seismic-volcanic activity of El Hierro (GUAYOTA El Hierro Island), with data about gas emissions (geochemistry), thermometry (geophysics), deformation (geodesia) and seismicity (geophysics) registered by IGN. Besides that, the usual monthly reports about El Hierro will continue.

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NOTE AVCAN 385 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 16 2011-11:30 h peninsular - seismic-volcanic activity continues to moderate, without seismicity located in the iron, and with some weak events detected (00:26 and 03: 30). Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that after the minimum at 20:30 h yesterday, rose rapidly until midnight, and now continues with a lighter rise in the latest hours. In addition, notice some explosions, possibly hydromagmatic, weak, especially after 3 am. No new earthquakes located. Before yesterday 0. Yesterday 1. Now go 0. A total of 11,932 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011. (Enrique)

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A pulse of seven minutes in the tremor changed the upward trend in recent days
[bron]
A pulse of seven minutes in the tremor changed the upward trend in recent days
IGN scientists are not aware that there have been issuing new magmatic material

A pulse of tremor associated with submarine eruption of El Hierro, extraordinarily long, yesterday marked a change in its evolution. Thus, starting at 13:02 hours decreases the frequency and amplitude of the pulses to decay significantly on 18:20 hours. The oscillation of these pulses is considered normal in the evolution of the eruptive phenomenon is visible on the surface. In the stain clearly shows a dark brown head, fairly bubbling in the middle, and a green area, which confirms the presence of gases. IGN scientists are not aware of new magmatic material has appeared on the surface. On the GPS deformation monitoring stations recorded the same pattern of recent days, following the trends of stability in both the vertical component in horizontal components.

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Update 16/12 – 17:59 UTC
- Very unstable harmonic tremor with a couple of very strong bursts in between 16:00 and 17:00. To soon to predict whether the eruption will stop or continue. After each burst the tremor seems to subside strongly and is picking up a little later.
- The UStream webcam from the El Pinar authority is delivering the best images this afternoon. Sometimes, our imagination sees very faint stirring activity.
- Joke had a chat this morning with the RTVC webcam operator. He said that the strong wind was very uncomfortable and that he was allowed to return home today. So, thanks to Joke we know that this webcam (the best of all webcams) is manually operated as well as the reason why ha was down today!
- Joke said that the stain was still visible from above La Restinga but no activity in it
- She also went to the CAP, science center, and had a talk with the IGN man of duty.
- Joke saw the helicopter flying over this morning, so probably we will have new images and video late tonight

Update 16/12 – 23:59 UTC
- Involcan and the Guardia Civil Helicopters made a surveillance flight today. You will see that the eruption has subsided a lot as could be seen on the harmonic tremor graph, but she is still continuing at lesser pace. The gray eruptive vent remained visible and the stain was still very large.

Data Update 17/12 – 09:19 UTC
- A new earthquake measuring 2.3 magnitude occurred 22 km deep below Los Llanillos in the El Golfo area. It will trigger mixed feelings for 2 groups of people. At the one hand the volcano enthusiasts who will see it as a sign that the volcano is not dead yet and at the other hand the local people who are highly irritated with this activity.
- Harmonic tremor was medium all night long with a slightly increasing trend and some occasional short bursts. Yesterday, the tremor subsided strongly after every burst, but this does not happen anymore since 01:00.
- A faint Jacuzzi area can be seen at times in the Telefonica Cabildo eruption webcam (look at the thin white line 1 cm lower than the horizon and vertically above the left harbor wall. The rough see if sometimes blocking the view, but we have seen it many times this morning

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NOTE AVCAN 387 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 17 2011-10:00 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the Gulf and some weaker event detected. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that continues with a lighter rise throughout the day with some explosions, possibly hydromagmatic. The magnitude of the earthquake only 2.3. New earthquakes 1. 22km depth. Days ago 1. Yesterday 0. Today they 1. A total of 11,933 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011. (Enrique)

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Update 17/12 15:03 UTC
- The readings of harmonic tremor of the last several hours are indicating that the eruption is not over yet. Medium tremor is not subsiding as strong as before and bursts are again picking up in number.
- Afternoon back-light /glare is blocking a good view of the eruption area in the Las Calmas sea. We expect a better view on what is happening within 2 to 3 hours.
- Joke is a frequent visitor of the CAP / IGN science center in La Restinga and was informed yesterday that IGN has 3 webcams serving their team.
- Carmen Lopez told Joke the day before yesterday that the closure of the La Restinga nightly surveillance will not have any impact on the 24 hours service they are delivering. The eruption is continuously monitored for 24 hours, but in between 20:00 and 08: 00 it is monitored from Madrid. In case of necessity (Madrid seeing some important change) or whenever local people are alerted in La Restinga, the local La Restinga guard will be operational again. If an important change would be noticed, Pevolca will decide immediately to restart the local 24 hours surveillance at La Restinga. Carmen said to Joke that the continuous 24 hours operations are having a serious burden on the IGN personnel. Delegating the follow up to Madrid during the night allows them to work at more comfortable hours.

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NOTE AVCAN 388 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 17 2011-22:00 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the Gulf and some weaker events detected, including a microseismic swarm from 19:06 to 19:23 h. Continue an important sign of volcanic tremor in the Restinga area, with a stable amplitude continues throughout the day, with some explosions, more and more numerous, possibly hydromagmatic. The magnitude between 1.4 and 1.0. New earthquakes 2. 3km depth. Days ago 1. Yesterday 0. Now go 3. A total of 11,935 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011. (Enrique)

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Update 18/12 – 09:20 UTC
- Bad news for the volcano fans-followers among our readers. The eruption is subsiding further and looses more and more strength.
- We do not know whether there is a direct connection with what happened yesterday afternoon as it can not be linked with the harmonic tremor graph, but we think that there is certainly an indirect relation. Yesterday afternoon 2 weak earthquakes occurred at very shallow depth in the coastal El Golfo area. The first one occurred at 15:24 had a magnitude of 1.0 and occurred at a depth of 3.4 km. The second one occurred 1 minute later, had a magnitude of 1.4 and occurred at a depth of 3.0 km.

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NOTE AVCAN 389 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 18 2011-10:30 h peninsular - seismic-volcanic activity continues to moderate, without seismicity located in the Hierro, but with some weaknesses detected event (04:49 and 08: 45). Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that continues to decrease since the last part more than 50% to half of the signal, with some explosions, possibly hydromagmatic. No new earthquakes located. Before yesterday 0. Yesterday 3. Now go 0. A total of 11,935 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011. (Enrique)

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The INVULCAN continues to record a decrease in the diffuse emission of CO2 by the volcanic system island of El Hierro

This downward trend since late November until now reaching 770 � 30 tonnes per day

Since last July, scientists at the Institute of Technology and Renewable Energies (ITER), an agency of the Cabildo of Tenerife, and is now part of volcanological Institute of the Canaries (INVULCAN), 10 500 have been more diffuse flow measurements carbon dioxide (CO2) through numerous scientific campaigns on diffuse volcanic gas emissions that have materialized over the entire surface of the island of Isla Meridian. The latest results confirm a downward trend in the diffuse emission of carbon dioxide (CO2) into the atmosphere by the volcano island of El Hierro since late November, when it came to achieving the 2398 � 115 tons per day, until now reaching to register for an emission rate of 770 � 31 tonnes per day.

This record to the bottom of the diffuse emission of carbon dioxide (CO2) suggests a potential loss of pressure carbon dioxide (CO2), from late November to date, the system magmatic-hydrothermal volcanic-existing in the Island El Hierro. These results are consistent with the records of seismic activity as well as horizontal and vertical shifts that are registered through permanent instrumental network

The scientific purpose of these campaigns is to investigate spatio-temporal variations of the diffuse emission of carbon dioxide (CO2) into the atmosphere by the volcanic system of El Hierro island since the results thereof can not be obtained through networks permanent instrumental analysis contribute to the evolution of the current eruptive phase is occurring in El Hierro. On the other hand, it is widely accepted that the gases are the driving force of volcanic eruptions and monitoring of carbon dioxide (CO2) in volcanic surveillance programs is very important because not only is the second major component of volcanic gases after water vapor, but also because of its low solubility in molten silicitados (magma) favoring the carbon dioxide (CO2) to escape with their ease of volcanic systems in depth.

These scientific surveys have failed to materialize due to MAKAVOL project "Capacity Building of R + D + i + d to contribute to the reduction of volcanic risk in the Macaronesia (MAC/3/C161)" which is being co-funded by the transnational Cooperation Programme of the European Union Madeira-Canary-Azores (MAC 2007-2013) and the collaboration of the Island Councils of Tenerife and El Hierro.

INVULCAN is an institution demanded unanimously by the Senate (2005), Parliament of the Canary Islands (2006) and House of Representatives (2009) with the aim of contributing to improving and optimizing the management of volcanic risk in Spain.


Picture Pie
Temporal evolution of the diffuse emission of carbon dioxide (CO2) in the island of El Hierro (red circles) recorded by the INVULCAN and the daily number of earthquakes located above magnitude 1.7 by the National Seismic Network (IGN).

[bron]

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NOTE AVCAN 390 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 18 2011-22:30 h peninsular - seismic-volcanic activity continues to moderate, without seismicity located in the Hierro, but with some weaknesses detected event (09:57 and 15: 07). Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that continues to decrease since the last part over 60% in the last 24 hours, with some explosions, possibly hydromagmatic. It seems that in the last hour begins to rebound. No new earthquakes located. Before yesterday 0. Yesterday 3. Now go 0. A total of 11,935 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011. (Enrique)

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Update 18/12 – 23:59 UTC
- Another Involcan / Guardia Civil video from today, but this time with the Panoramic Camera – Video 1 and Video 2
- Involcan confirms that a new vent has opened to the south east of the former vent. The images are similar than those recorded in October. The same kind of vent and stain colors. The vent seems to be limited in size.
- CO2 levels (measured by the Involcan) have decreased further

VUELO CIENTÍFICO INVOLCAN - GC 181211 - VOLCÁN SUBMARINO DEL HIERRO - NUEVOS BURBUJEOS - PANCAM I

VUELO CIENTÍFICO INVOLCAN - GC 181211 - VOLCÁN SUBMARINO DEL HIERRO - NUEVOS BURBUJEOS - PANCAM II

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NOTE AVCAN 391 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 19 2011-10:30 h peninsular - seismic-volcanic activity continues to moderate, with seismicity in the Gulf and with some weak events detected (Wednesday 22:23, 02:20, 3:36, 07:41 and some more). Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that has begun to increase since midnight, in more than 20%, with some explosions, possibly hydromagmatic. The magnitude of only 2.0 earthquake is located. New earthquakes 1. 19km depth. Before yesterday 3. Yesterday 0. Today they 1. A total of 11,936 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011. (Enrique)

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NOTE AVCAN 392 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 19 2011-21:30 h peninsular - seismic-volcanic activity continues to moderate-low, without seismicity localized, but with some weak events detected. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that has begun to increase since midnight, in more than 30%, with some explosions, possibly hydromagmatic. No new earthquakes located. Before yesterday 3. Yesterday 0. Today they 1. A total of 11,936 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.


^{[voor de betekenis van de kleurtjes]}

WARNING => FOR THE FALL OF EARTHQUAKE, VOLCANIC ACTIVITY, FROM MORNING BRIEFING NOTE THERE WILL BE A ONE DAY, THE IN THE MORNING. This does not mean that there is any special note if there is a surge of activity. (Enrique)

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Update 19/12 23:30 UTC
- NO more earthquakes this afternoon and evening
- CAP science center in La Restinga has confirmed that the the main vent is probably no longer active but that some minor side vents are now erupting. As we could see on the webcam during the day, the location of these vents is a little more to the north-east. IGN will certainly report on this new activity the following day(s).
- AVCAN (Actualidad Volcanica de Canarias) will decrease his number of daily El Hierro reports to one per day as a result of the subsided activity. They will increase their reporting when the vents would reactivate.

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Update 20/12 23:55 UTC
- Harmonic tremor is growing again since the last couple of hours
- At 18:26 UTC a weak M 0.9 earthquake happened at a depth of 11 km below the El Golfo beach area

Update 20/12 23:43 UTC
- Joke has a talk with Maria Jos� Blanco from IGN during the morning hours. Here is synopsis of the answers Joke got on her many questions :
- the current emissions are mainly gas emissions
- gas is part of the erupting magma and while magma is flowing down along the volcano slope, the gas finds his way to the surface
- sometimes the emission of gas is mixed with ashes, but we havent seen or analyzed the ash in the current new vents. We hope to get some samples today as the Salvamar Adhara is out to collect material. At the time of writing this update, no additional details are known.
- escaping gas can also trigger the tremors
- the main emitted gas component is CO�. We are anxious to see what will happen with the Involcan CO� statistics as we see a lot of gas coming out of the vents. Since the end of November the measured CO� values are almost constantly decreasing.
- i can also tell you that a new bathymetry mission of the Sarmiento da Gamboa is on its way and will start on Thursday. The Sarmiento will probably only work at night. Joke jokes that we will certainly tell this to our readers as we want to avoid another hoax lava eruption : ) . (ER : we also remind our readers that the harmonic tremor graph will probably show drumbeats caused by the instruments of the Sarmiento).

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As a weak sismito in Frontera afternoon, just below CTAN almost certainly now the IGN maps showing where all the seismic stations on the island, every detail of quality. As the tremor is down, can see and recognize in the smaller earthquakes simogramas since they are not shielded. (Enrique).
1117890 20/12/2011 18:26:14 27.7645 -18.0580 11 0.9 4 W FRONTERA.IHI

[bron]

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NOTE AVCAN 394 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 21 2011-10:30 h peninsular - seismic-volcanic activity continues to moderate-low, with seismicity located in the Gulf, the Julan and mar de las Calmas. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that has been fluctuating since the last part, with some smaller explosions than other days, possibly hydromagmatic. No new earthquakes located. Days ago 1. Yesterday 1. Today van 2. A total of 11,939 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

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Update 21/12 – 11:13 UTC
- 4 out of the last 6 earthquakes we have noticed the last couple of days are occurring at “unusual” depths. Also the 2 earthquakes from earlier today happened at 17.9 km (below land) and 13.1 km (Las Calmas sea) (for details zie hierboven). Just like AVCAN, we also think that these 2 earthquakes occurred in the vicinity of the feeder lava tubes who are connecting the El Golfo area with the Las Calmas sea vent. We are very curious to look at todays satellite picture (will take a few more hours) to find out if other vents have opened, as we cannot see any activity on the webcams.
- The GPS deformation graph which we can see on the IGN website shows NO significant increase but NO significant decrease neither.

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Update 21/12 13:52 UTC
As promised before, our attention this afternoon was also going to the NASA Modis satellite picture. We have mounted 3 pictures under each other, each one showing the stain in another way.
Picture 1 is the visual picture as extracted from the Modis satellite picture of today (lucky that El Hierro was cloud free today)
Picture 2 is the same picture color enhanced but also with the current vent patch (which we made white)
Picture 3 is the same picture color reduced
If you click on the picture a full size version of the extract can be seen.
The NASA modis picture is courtesy NASA Earth Data

plaatje 2 en 3 op earthquacke report te vinden

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Eruptive PROCESS EL HIERRO STILL ACTIVE SIGN AS SHOWN IN THE TREMOR OF THE LAST DAYS.

12/21/2011 ... 18:23 - Ministry of Economy, Finance and Security

IGN has confirmed the location of two earthquakes since Sunday December 18

The National Geographic Institute (IGN) has confirmed the direction of the Civil Protection Plan for Volcanic Risk (PEVOLCA) that shows the signal as the tremor associated with the eruption, the eruptive process in El Hierro is still active. Based on these data, last Sunday, December 18, the signal decreased slightly presenting tremor few intermittent pulses, while on Monday increased very slightly since the beginning of the day until 8:00 am when he held constant, present virtually pulses. On Tuesday, the tremor signal decreased slightly since the beginning of the day until 10:00 hours remaining stable until the night that showed a slight increase.

As for earthquakes during the last three days two movements have been found, none of them felt by the population. The first occurred on Monday, December 19th at 4:09 pm with a magnitude of 2.0 on the Richter scale and 19 kilometers deep. The second, recorded on Tuesday, at 18:26 hours, reached a magnitude of 0.9 and was located at a depth of 11 kilometers.

Deformations

Control stations of the deformation maintain the same pattern of recent days, following in general the same trend of stability in the horizontal components. For its part, the pattern in the vertical components is deflation at the stations south of the island and stability in the rest.

On the spot, during the day on Sunday, it was not easily distinguishable due to the intense surge since the issue seemed weaker. The head could be seen, although less clearly than in previous days, surrounded by a blue-green area.

On Monday, the head of the stain was clearly visible in the morning as a lighter area that was driven by surface currents, while on Tuesday, due to strong winds and the sea state, the head could not be visualized appreciating slightly more surface area affected by the eruption.

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NOTE AVCAN 395 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 22 2011-13:00 h peninsular - seismic-volcanic activity continues to moderate-high, with seismicity located in the Gulf, the Julan and the Sea of las calmas. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that is increasing with slight fluctuations since the last part with a few more explosions than other days, possibly hydromagmatic. The magnitude between 2.8 and 2.2. New earthquakes 2. 22 and 26km depth. Days ago 1. Yesterday 3. Today they 1. A total of 11,941 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

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Op donderdag 22 december 2011 13:40 schreef 1boefje het volgende:
Dus de regelmatige bevingen worden wat minder en rustiger, maar opeens zijn er af en toe uitschieters. Houdt dit weer in dat er magma naar boven komt?
Wat zegt dit?

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Op donderdag 22 december 2011 14:22 schreef 1boefje het volgende:
Maar wat betekend deze verandering dan?
Of weet niemand dat?

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NOTE AVCAN 396 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 23 2011-11:30 h peninsular - seismic-volcanic activity continues to moderate, localized seismicity in the Gulf and the coastal area of Julan to Tacor�n Creek. Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that is increasing with slight variations in maximum and minimum intensity approx every 6 hours since the last part with a few more explosions than other days, possibly hydromagmatic. The magnitude of 1.6. New earthquakes 2. 15 and 16km depth. Before yesterday 3. Yesterday 1. Today van 2. A total of 11,943 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

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More about volcanic seismology from the OVSICORI:
"The seismic signals originating from volcanic areas, are unique to each volcano and will depend on the activity that counts and that is why many researchers have studied different seismic signals can be recorded in a volcano. Some of them and Minakami, Latter, Chouet, McNut, Koyanagi, White and others have contributed according to their experiences in different active volcanoes and with the advancement in technology in the classification of volcanic earthquakes. "(John Vincent)

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Update 23/12 14:00 UTC
Todays NASA Modis satellite image (from max. a couple of hours ago) shows a very strange picture from the stain and the emission vent. The left white patch is the main vent emission point and small stain. The right white patch at the smallest point of the stain maybe a small remaining cloud patch from the bigger cloud range below it.


en de originele versie

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NOTE AVCAN 397 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 24 2011-10:00 h peninsular - seismic-volcanic activity continues to moderate-low, without seismicity localized, but with some weaknesses detected event (23:06 h yesterday, 00: 13, 05.20, and 6:23 h). Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that is increasing (15%) since the last part, with some explosions, possibly hydromagmatic. No new earthquakes located. Days ago 1. Yesterday 2. Now go 0. A total of 11,943 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

Today shows the deformation, especially the HI04 that maintains tendency to deform (Withdraws from la Frontera) and HI03 does not move. FRON also seems that maintains the trend on TN03 and MAZO IZAN (walks).

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Important Update 25/12 – 09:23 UTC
- IGN reported a new M 1.6 earthquake at a depth of 21 km at 01:14. Epicenter in the El Golfo bay
CISC (Unidad de Tecnolog�a Marina del Consejo Superior de Investigaciones Cient�ficas) has reported yesterday that the top of the main vent has collapsed 15 to 20 meter. The new depth was obtained during a bathymetry mission by the research vessel Sarmiento de Gamboa. The acoustic image was made last Thursday and Friday (when we saw the Sarmiento de Gamboa going up and down on the stain) .The white line on the image is the sea floor. The orange tones are reflecting the erupted magma. The suspended material that we can see in the stain and on the emission vents is colored brown (ER: hard to see but on top). The orange colored magma is flowing down along the slopes of the cone.
Last time, the depth of the cone was measured as 140 to 150 meter by the Ramon Margalef. Taking into account the new acoustic study, we can conclude that the depth is now in between 155 and 170 meter, still far away from a Surtseyan eruption.

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NOTE AVCAN 398 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 26 25 2011-10:00 h peninsular - seismic-volcanic activity continues to moderate, without seismicity located with seismicity located in the Gulf and some weak events detected. Continued volcanic tremor signal important in Restinga area, with an amplitude that is increasing (5%) since the last part, after midnight on something and then has vueto up with some explosions, possibly hydromagmatic. The magnitude between 1.6 and 0.9. New earthquakes 2. 15 and 21km depth .. Before yesterday 2. Yesterday 1. Today they 1. A total of 11,945 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

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SURFACE AREA IN THE cone of el Hierro volcan has decreased from 15 to 20 M.

24/12/2011 ... 15:47 - Ministry of Economy, Finance and Security

This is a normal process in the formation of volcanic cones that balance adjustments volcanic structure

The Sarmiento de Gamboa oceanographic ship a new acoustic image capture in the area of the eruption

The Marine Technology Unit of the CSIC has informed the direction of the Civil Protection Plan for Volcanic Risk (PEVOLCA) that according to barim�trico recognition by the Sarmiento de Gamboa research vessel the most superficial of the volcanic cone on the island of El Hierro has experienced a small decrease of about 15 to 20 meters. This process, they say, is common in the formation of volcanic cones that undergo rapid growth and a series of adjustments that rebalance the volcanic structure.

In addition, the Marine Technology Unit of the CSIC has provided the direction of an acoustic image PEVOLCA obtained yesterday with one of the Sarmiento de Gamboa fishfinders showing what was happening at the time of image capture in the area the eruption.

In the image, comparable with ultrasound, the white profile corresponds to the relief and topography in the area of the volcano, while orange tones reflect the material being ejected from the volcano.

Also, in the time when the measurement was made, the emission from the volcano reached the surface. Some of the materials were suspended in the superficial zone correspond to the color brown stain is observed on the surface. For its part, the material of orange, it falls from the surface on the flanks of the volcano and the whole area of the eruption.

Tremor and seismicity

On the other hand, the National Geographic Institute (IGN) has confirmed to the direction of PEVOLCA in the day yesterday tremor signal remained at the same values of the previous days although presenting greater variability of long period during the day, no pulses.

As for earthquakes, it is noteworthy that in the day yesterday there were two earthquakes with a magnitude of 1.6 degrees, none of them felt by the population. The first, at 2:16 hours was found in the area of the Gulf and 16 kilometers deep, while the second was recorded at 4:09 hours southwest of El Pinar at a depth of 15 kilometers.

In total, from July 19 11 934 events were located on the island of El Hierro.

Deformations

The control stations maintained a stable pattern deformation in the horizontal COMPONENTS and a tendency towards stability in the vertical throughout the island

With respect to the spot, on the morning of yesterday appreciated the greenish stain extending to the south and no header. During the afternoon there was bubbling in the downtown area and stain issuer extending around to the southeast.

In addition, the report of the flight mission conducted in 103 SASEMAR yesterday afternoon, indicated the detection of a circular well-defined focus in the broadcast area without observing material or surface water vapor. The IR sensor detected an anomaly of 2.2 � C in the emission from the sea in the background.

Acoustic image of the eruptive process =>
PDF van gister geplaatst plaatje

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NOTE AVCAN 399 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 26 2011-11:00 h peninsular - seismic-volcanic activity continues to moderate-low, with weak seismicity located in the Gulf and some weak events detected. Continued volcanic tremor signal important in Restinga area, with an amplitude similar since the last part (no signal since yesterday after 22:00 h, just looks a bit from 7:00 to 9:00 h) with some explosions, possibly hydromagmatic. The magnitude of only 0.6 earthquake. New earthquakes 1. 12km depth. Before yesterday 2. Yesterday 1. Today they 1. A total of 11,947 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

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NOTE 400 AVCAN - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 27 2011-10:30 h peninsular - seismic-volcanic activity continues to moderate-low, without seismicity localized, but with some weaknesses detected event (1:13 and 3:28 a.m.) . Continue an important sign of volcanic tremor in the Restinga area, with an amplitude that is on the rise since yesterday at 19:00 h (40%) since the last part, with some explosions, possibly hydromagmatic, especially increasing from midnight. No new earthquakes located. Days ago 1. Yesterday 1. Now go 0. A total of 11,947 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

In the spectrogram can clearly see the earthquake of 3:28 pm

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54 Stunning photos of El Hierro and the area of eruption, taken yesterday morning from the Civil Guard helicopter with scientists from INVOLCAN.

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Earthquake of 6.5 in the middle of the Siberian plate in a place where normal is not very powerful so this seismicity. It shows a teleseismic at all stations on line of the Canary Islands, except the CHIE that shielded by the tremor signal, which continues to rise, now is three times stronger in amplitude than yesterday when it began to climb 19:00 pm o'clock
M 6.5 - SOUTHWESTERN SIBERIA, RUSSIA - 27/12/2011 15:21 UTC
[bron]

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Update 28/12 – 08:05 UTC
- 1 hour later it looks like we had a vent collapse as the tremor is getting gradually back again


Update 28/12 – 07:05 UTC
- After some really turbulent harmonic tremor in between 05:00 and 06:00, harmonic tremor came almost to a halt. We do think that the eruption subsided a lot the last several days but that the current decrease has to be linked to a vent collapse. If this is the case the harmonic tremor will gradually pick up gain as the magma finds his way out.

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NOTE AVCAN 401 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 28 2011-10:30 h peninsular - seismic-volcanic activity continues to moderate, localized seismicity in el Golfo and Mar de las Calmas and some weak events detected. Continued volcanic tremor signal important in Restinga area, still strong until between 5:00 and 6:00 madrugaga has been made to hydromagmatic stronger explosions, 3 or 4, by interaction with water which have had to change the morphology of the outlet duct, or open another mouth, cleared completely, and making it flow smoothly, which has led to the fall of the tremor. After an hour with low tremor, has been again giving small cyclic explosions, the so-called Drumbeats .. these if they are .. with very short bursts at a mean time interval (such as half a minute or so). As for earthquakes, the magnitude was between 1.8 and 0.8. New earthquakes 3. Depth at 9, 12 and 21km. Days ago 1. Yesterday 2. Today they 1. A total of 11,950 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

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A personal opinion: I have the impression that the submarine volcano has released the final raspberry after a long deposition.
What I say of raspberry crackling under final.

And here's a theory that has upset the balance water-magma-pressure gases and it has penetrated the fissure running fast to cause evaporation and the resulting "bloat" as volcanic farts.

The result would be the crystallization of magma near the crack sealing and practice the same, preventing movements "peristaltic" of magma that no longer runs and therefore the tremor.

However, the digestion is not over ... would expect an increase in bowel sounds in the form of seismicity, and who knows ...

Turns out, the specific heat of water is 4 times greater than that of basaltic magma in mass, although the basalt is three times denser than water, the water still has greater cooling capacity comparing volumes. Therefore, it may have been broken as well preventing thermal equilibrium crystallization of basalt. But ... does not mean that the magma continues to have no end pressure ... simply does not flow as before because the water cools more quickly the volume of magma produced than before ...

That pressure, residual, could still have enough force to cause the opening of a crack after an event after shooting? Is it in the salty sea or land would be where the magma cools both the lack of water?
Counter-theory and opinions are welcome, the discussion comes the light.
(JR)
[bron]

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Update 29/12 – 07:50 UTC
- Although we only had minor harmonic tremor all night long, we were very surprised to see a beautiful stain this morning. It can still be seen at this time on the Eruption webcam. At regular times we see a jacuzzi in the middle of the stain and on the same location as the former vent.
- El Hierro experienced a new M 2.3 earthquake at a depth of 18 km at 02:46 earlier today.

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NOTE AVCAN 402 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 29 2011-9:45 pm peninsular - seismic-volcanic activity continues to moderate, weak seismicity located in the las Calmas sea and some weak events detected. Continued volcanic tremor signal in the Restinga area, after standing today from 10:23 h to 16:37 h, with an amplitude that has been rising since the small phreatomagmatic explosion yesterday at 8:46 after which the tremor almost stops, but was recently restored and is still rising. The magnitude of the earthquake of 2.3 only. New earthquakes 1. 14km depth. Before yesterday 2. Yesterday 3. Today they 1. A total of 11,953 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

La Restinga, El Hierro 29th December 07.30 - 08.30 UTC Time Lapse

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Update 30/12 15:11 UTC
- A third earthquake occurred only 2 minutes after the second and ONLY 1 km from El Pinar :
1119453 30/12/2011 13:01:32 16 1.1 W EL PINAR.IHI

Update 30/12 13:28 UTC
- Joke sends her regards to all those people who enjoyed her participation to this report for the last couple of months and she also thanks those people sending her a happy birthday yesterday and today.
- 2 new earthquakes occurred with only 32 seconds in between them
2011/12/30 12:59:04.60 Depth 19.60 M 1.80 NW FRONTERA.IHI
2011/12/30 12:59:36.14 Depth 22.70 M 1.10 W FRONTERA.IHI

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NOTE AVCAN 403 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 30 2011-10:00 h peninsular - seismic-volcanic activity continues to moderate, weak seismicity located in the sea of calmas, in the Julan and in the dorsal area South Rerstinga above as well as some weak events detected. Continued volcanic tremor signal in the Restinga area, with an amplitude that has been rising since the pop phreatomagmatic of day before yesterday but in the last two hours has started to fall. The magnitude of 1.5 and 1.4. New earthquakes 2. 15 and 16km depth. Before yesterday 3. Yesterday 3. Now go 0. A total of 11,955 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

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The tremor in addition to rise and have to watch from time to time some sismito, as of 20:15, now beginning to have more powerful explosions hydromagmatic which was having until now, at 20:27 and 20:45, possibly due to water entering the duct system where they exit the volcanic magma eruption near the Restinga. Would not surprise me that they had been felt, then remember to complete the questionnaire macrosisimico IGN for this purpose ... (Enrique)
[bron]

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Magneto �quee?
Aerial magnetometry. Is the most overlooked?
Earth's magnetic field is not uniform, moreover, is changing over time. Why? Because "Gaia" or "Gaya" as the ancient Greeks called Mother Earth, appears to be a living being. Moves inside.
The Earth's core, composed mainly by heavy metals, castings, such as iron and nickel (and GOLD! One of the densest metals, but non-magnetic) ... magnetic properties are known. This nucleus seems to work as a dynamo, and its motion generates the field that makes compasses point to magnetic north current location, not the North Pole, but somewhere in northern Canada, a place ... weird strange place, it is constantly changing position over time!
Also consider that the earth is round or flat ... but an ovoid (egg) irregular.
The variations of the magnetic north pole has been such that in the course of geologic time has come even to reverse of form and manner that the magnetic north pole has been placed several times in the Earth's geographic South, thing that happens with some frequency (the frequency measure geologic time). These variations are studied one branch of science called paleomagnetism.
But let's talk about paleomagnetism, but more subtle and small variations of the magnetic field in shorter times (not geological but years), not globally, but very local. Variations so small they are measured in nano-Teslas.
Why are these small variations? Well, for several reasons:
It turns out that the composition of the soil and subsoil, is not uniform, and in the case of volcanic systems is variable magmatic intrusions material. There are rocks, which contain more iron composition, and some less. In some, iron may be more magnetized than other factors such as being subjected to high temperatures during its formation, or ... Even more interesting, for defects that occur when piezoelectric materials tensioned pressures of strata over others. Remind them that the piezoelectric effect it can check the burners without flint, without battery, those in which an electric spark jumps as they hit a piece of mica that has been inside gossip.
And even more interesting is that, much magmatic material contains enough iron magnetic, such as basalt. Thus, the flow of magma generated in the magnetic field variations for the same dynamo effect that we cited earlier.
And how do you measure these changes? The most common method is the use of high-precision magnetometer in combination with GPS installed on airplanes or helicopters in gondolas hanging aerodynamic in flight. An efficient method that allows to cover large areas at a relatively low cost.
Hence the repeated measurement of micromagnetism variations can give us an idea of where you're going or where magma layers are more depressed or even find certain types of plutonic rocks, water, or oil and so on. and so on.
What's more! in both MapIT quasi "paleomagnetic" of the islands, accompanied, and paleomagnetic say because they are made with the results obtained during a 1993 campaign far, there is a curious circumstance: which is that in the Western Isles, and in where the largest magnetic anomalies are these anomalies coincide with areas of more recent volcanic activity:
- In La Palma, Zone and Volcano Tenegu�a San Antonio
- In central Tenerife Island, near the Chinyero, Pico Viejo.
- And in El Hierro in the area of Julan, Restinga and Sea of Calm!
Yes, gentlemen and gentlemen, a map of 1993 is giving us information about the places most likely to be developed eruptive phenomena, no less!
Hence, it creates, does not seem that you are giving due importance to the observations on the micro-variations of magnetism. Variations, which is not spoken in public by the responsible thing. We do not know, well, if it's because there have been no new observational campaigns aeromagnetic, either because of a lack of specialists in the matter, or by the general policy of "reserve" misinformation and anti-training.
Consequently, the Canary Islands should be candidates for regular flights provide insights into the evolution of the magnetic anomalies, and that, far beyond what is permitted stationary magnetometer stations installed in the archipelago whose measurements shall be reported to either "mob" from the obtuse set of acronyms that we all know, that is, do not realize, to all taxpayers.
But, why?
If no one knows what the magnetometry!
(JR)


[bron]

[meer info over magnetisme van de canarische eilanden (en spanje) (engelse PDF)]
En een spaanse PDF

quote:

NOTE AVCAN 404 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - DECEMBER 31, 2011-10:30 h peninsular - seismic-volcanic activity remains moderate, weak seismicity located in the Gulf, and the interior of the island, and some events weakest detected. Continued volcanic tremor signal in the Restinga area, with an amplitude that remains from the last note, though in the last two hours has begun to rise. The magnitude of 1.8 and 0.9. New earthquakes 4. Depth to 12, 16, 20 and 23km. Before yesterday 3. Yesterday 3. Today they 1. A total of 11,959 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

quote:

Update 31/12 – 11:07 UTC
- The Restingolitas, as the Smoking Lava Stones are called in El Hierro, are coming up at regular intervals. As our 2 good webcams are having server problems (also the Frontera webcams are down), we have to stay with the U-stream El Pinar webcam. He has a fairly good zoom, but as this is a fixed camera, he shoots almost always to the side of the SLS. The stones can be seen on the wide angle though. Keep looking.

quote:

NOTE AVCAN 405 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 01 January 2012-11:00 h peninsular - seismic-volcanic activity continues to moderate, moderate seismicity located in the Gulf and weak in the interior of the island, and some events weakest detected. Continued volcanic tremor signal in the Restinga area, with an amplitude that has decreased since the last tonight note, although in the last hours has begun to rise again. Yesterday saw the smoldering pyroclastic yesterday. The magnitude of 2.5 and 0.3. New quakes 8. Depth between 14 and 16 km (And one to 13 and another at 23km). Before yesterday 3. Yesterday 2. Now go 7. A total of 11,967 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

----------------------
THE VOLCANO OF El Hierro continues to emit magmatic material.

31/12/2011 ... 16:44 - Ministry of Economy, Finance and Security

Scientists aboard a boat Salvamar, last Friday could see large pyroclastic

The volcano of El Hierro continues to emit large steaming magmatic material, as they could check on the morning of Friday, scientists from the National Geographic Institute (IGN) from a boat Salvamar Maritime Rescue.

Since Thursday the issue was intensified in the header area where bubbling was observed and fine material. In addition, the green part was very definite throughout the day.

The report of the mission SASEMAR 103, notes the observation of three very small emission areas and the corresponding material derived from the south due to sea conditions and prevailing winds. Emission points in the water temperature was 17.5 � C, while the nearest clean water temperature was 19.6 � C.

Behavior of the tremor signal

During the day yesterday, Friday 30 December, the tremor signal recorded by the seismic monitoring network throughout the morning kept the same level reached the previous day. However, slightly increased its amplitude at 09:30 hours, coinciding with the emission of lava fragments on the surface and was also observed to a pulse energy throughout the day. This level was maintained for the day with slight fluctuations.

On Thursday, the tremor signal recorded by the seismic monitoring network maintained the level achieved the previous day, detecting some small pulses of short duration and slight fluctuations.

Although the signal has a low amplitude tremor is present in the record confirming continuity of the eruption.

Moreover, in terms of seismic activity located in El Hierro, Thursday and Friday, IGN posted a total of 6 events of low magnitude, although none of them was felt by the population. On Friday three movements were detected at a depth of between 16 and 20 miles, two of which were located in the area of ​​the Gulf, one sea and one on land, and the third also on land west of the town of El Pinar .

On Thursday, three events were recorded at a depth of between 14 and 16 miles, two of them located in the El Julan, of magnitudes 1.4 and 1.5, and another near La Restinga which reached 2.3 degrees of magnitude.

In total since July 19, 11 949 events have been found.

Deformation

Stations showed deformation control stations yesterday in the Gulf is a slight tendency towards the north in the horizontal components. In the rest of the island and in the vertical components showed a stable pattern.

quote:

Update 01/01 – 10:19 UTC
- The start of the year has not been missed by the volcano. A swarm of 7 earthquakes will probably give new strenth to the eruption. The number of earthquakes is the biggest during a limited time frame since many weeks.
- Harmonic tremor is still limited, which may be the cause of the many earthquakes
- Telefonica and Movistar will have some days off – The server problem is not yet solved (all 4 webcams do not work). We remind our readers that Movistar / Telefonica is one of the most important telecommunications companies of the world !?! We really liked what they did so far, but this can be handled better.
- The good old fixed U-stream webcam is the only one who also works on New Years day and he shows a lot of activity this morning. Big stain and a wide stirring area.

quote:

Update 02/01 – 13:38 UTC
- Joke made her daily morning walk and took a lot of beautiful pictures. The stain and the brownish center can well be distinguished on the images. Click on one of the thumbnails to watch the entire series.
- While making her walk she had a talk with the Cabildo / Telefonica maintenance webcam technician. When Joke asked him what was going on he was very surprised (means that he isn’t looking at the images himself) and he said that his webcam was working perfectly. He then continued saying that “it must certainly a Madrid servidor issue”. We are almost certain that in Madrid NOBODY knows what is going on.

quote:

NOTE AVCAN 406 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 02 January 2012-11:00 h peninsular - seismic-volcanic activity remains moderate with moderate seismicity located today in sea of las Calmas and yesterday in the interior of the island and the North as well as some weak events detected. Continued volcanic tremor signal in the Restinga area, with an amplitude that after growing up at 2 in the morning, then has halved in the last hours and has started to rise again. Yesterday saw the smoldering pyroclastic first thing and then there was a stain brown and bubbling. The magnitude of 1.8 and 1.1. New earthquakes 4. Depth to 10, 17, 22 and 34 km. Before yesterday 2. Yesterday 9. Today van 2. A total of 11,963 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

quote:

Op dinsdag 3 januari 2012 09:24 schreef kcgaga het volgende:
Weer een wat groei in de tremors.
[ afbeelding ]

quote:

Curiously, at least, that tremor reduction at low frequencies, the system, increase the noise in the higher frequencies as the graph CHIE PSD spectrogram. This may indicate that although magma output one can be sealed, the exhaust has increased. (JR)

quote:

New post for comments WEBCAMS. currently only works Pinar webcam or ACNpress Ayto and slick looks perfect .. sometimes greenish-brown, bubbling area at times and pyroclastic floating about smoking, are from time to time .. while writing this, I've seen a couple of them, especially the white smoke ... ^ _-(Enrique).

quote:

NOTE AVCAN 407 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 03 January 2012-10:15 h peninsular - seismic-volcanic activity remains moderate with moderate seismicity located on the ground today, close to the Restinga, east, and some weakest events detected.

Continued volcanic tremor signal in the Restinga area, with an amplitude that was down yesterday, then rallied from 20:00 h and doubled and that from midnight yesterday remains more or less stable, with downward and a small signal gain at all frequencies at about 6:23 pm Today, like yesterday besides the bubbling brown spot and pyroclastics are floating in the steaming webcams.

The magnitude of 2.0. New 1 + 1 revised earthquake yesterday. Depth to 16 km. The day before yesterday 10. Yesterday 2. Today they 1. A total of 11,965 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

VUELO CIENTÍFICO INVOLCAN - GC 020112 - VOLCÁN SUBMARINO DEL HIERRO - CENIZAS Y GASES VOLCÁNICOS

VUELO CIENTÍFICO INVOLCAN - GC 020112 - VOLCÁN SUBMARINO DEL HIERRO - BURBUJEO Y CENIZAS

quote:

THE EXTENT OF THE TREMOR OF EL HIERRO eruptive process is almost constant.

03/01/2012 ... 15:37 - Ministry of Economy, Finance and Security

The tremor signal recorded by the seismic monitoring network of the National Geographic Institute (IGN) has remained almost constant during the second day of January, as reported by that body to the direction of the Civil Protection Plan for Volcanic Risk ( PEVOLCA).

Specifically, the signal continued until 3:00 am then a constant amplitude amplitude decline sharply, beginning a slight gradual increase until it stabilizes at 6:00 for ten hours. After this period and within a low level of tremor, the signal began recording a slight decrease in amplitude for four hours, recovering the level of middle of the day. Although the signal has a low amplitude tremor is present in the record confirming that the eruptive process continues.

Regarding the seismicity should be noted that, during the day yesterday, is located two low-magnitude events in the area of the Julan, around three in the morning, which were not felt by the population .. In total, since the day July 19, 2011 11 959 events have been found.

Deformation
The deformation monitoring stations throughout the island show a stable pattern in the vertical component and the horizontal. At stations located south vertical is a trend of deflation.

Spot
For its part, the stain was visible throughout the day with a well-defined bubble and fine material. The green part widely spread eastward from the broadcast center, by the action of ocean currents. The day before, on January 1, the emission area was well defined with a brown center and in the morning there were moments of matter emissions. During the rest of the day was observed bubbling bad that sometimes even produced bubble rings

quote:

NOTE AVCAN 408 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 04 January 2012-10:45 h peninsular - seismic-volcanic activity remains moderate with moderate seismicity located in the north today, in the sea of el Golfo, and some events weakest detected. Continued volcanic tremor signal in the eruption of the Restinga, with an amplitude that remains more or less stable. Today, like yesterday besides the bubbling brown spot and pyroclastics are floating in the steaming webcams. The magnitude of 1.4. New earthquakes 1. Depth to 16.7 km. Before yesterday 2. Yesterday 1. Today they 1. A total of 11,966 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.

quote:

Update 04/01 – 10:49 UTC
- A lot of SLS / smoking pumice this morning.
- Salvamar Adhara is out to pick up material or even to try videotaping what happens (if they are ready to risk their material).

quote:

Op woensdag 4 januari 2012 12:55 schreef Jumparound het volgende:
ben benieuwd wanneer het nieuwe eiland geboren gaat worden

La Restinga, El Hierrom 4th January Morning SLS Time Lapse

quote:

These days ago they got some pictures of a new island that has emerged from the sea by volcanic activity in the archipelago of Zubair Island in the Red Sea, this video is part of that activity.
These images can help us imagine what might happen in El Hierro .... La Restinga is more or less the same distance from the emission point of the islet on which passes behind the eruption column and all the ash falling .... on second thought, do not pass ... (Enrique)

quote:

The thing is that this new island in the Red Sea took months without showing seismicity or anything ... and out of the blue on December 19 began to see the plume and emerge from water in a fairly surtseyana apparently .....

يارب رحمتك .بركان البحر الاحمر تصوير حصري لسفينة ينبع

بركان البحر الحمر (2).ياربي رحمتك.تصوير حصري لسفينة ينبع

quote:

Update 04/01 – 22:22 UTC
There we go again and take the information as it is – we are not responsible when it should be a boat : )
- Reader Hein commented in our comments section below that he has seen at irregular intervals glowing ashes on the (still zoomed) eruption webcam. After our boat lights history we were far from eager to put this information online, but after looking at the webcam ourselves, we saw the same short-lived incandescent light at various locations . AVCAN members are also sure ! It is smoking lava !
Joke is currently out with her binoculars to look to the sea. She has not seen the glowing lava pieces yet but, sitting on some lava field outside La Restinga, she sees the stain clearly in the moonlight.
This is what can be seen now on then on the eruption webcam (we have captured 2 of the pictures ourselves in about 10 minutes time):

quote:

NOTE AVCAN 409 - EARTHQUAKE ACTIVITY-VOLCANIC - HIERRO ISLAND - 05 January 2012-09:45 h peninsular - seismic-volcanic activity remains moderate with moderate seismicity located in the north today, in the sea of El Golfo, and some events weakest detected. Continued volcanic tremor signal in the eruption of the Restinga, with an amplitude that is held in a spherical pulses 12h 30 min up and down in intensity, doubling the maximum amplitude from the lows. All day yesterday and last night were steaming pyroclastic floating in webcams. The magnitude of 1.8. New earthquakes 1. Depth to 13 km. Days ago 1. Yesterday 1. Today they 1. A total of 11,967 earthquakes are located in El Hierro by IGN from 9:00 am of July 19, 2011.