[aktueel] Vulkaanuitbarsting bij Canarische Eilanden #3

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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 Teneguía 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

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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

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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)

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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).

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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.