[aktueel] Vulkaanuitbarsting bij Canarische Eilanden #3

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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).