El Hierro

[jand]

http://www.vulcanospeleology.org/sym06/ISV6x31.pdf

Cave system under El Hierro .

[jand]

Update 24/02 – 14:48 UTC
 - We have a clear reactivation of the volcanic activity
 - a faint jacuzzi is present all day long
 - HT seems to pick up a little bit
 - 5 earthquakes today
 -Ramon Margalef is still cruising not only in front pf the coast, but also near the main vent


Ramon Margalef with faint jacuzzi in the background

[jand]

http://www.02.ign.es/ign/resources/volcanologia/CHIE/imagenes_sismica/HORA_SP/CHIE_2012-02-24_17-18_sp.jpg

There are comments on Avcan FB that this could be a regional earthquake?

[jand]

Note 460 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 25 February 2012-11: 15 pm peninsular - earthquake and volcanic activity is continuing moderate seismicity today in the area of summits and the escarpment of the Gulf, one of them at considerable depth (33.3km).Yesterday afternoon followed by the area of summits, the Julan and a pair of earthquakes in the sea, to the N and S of the island. Continuous played quite microsismicidad detected but not located in the spectrogram. The signal of volcanic tremor continues in the eruptive area of la Restinga, which is kept low but after reducing something again yesterday, looks to increase restoring what was lost and more. New revised 7 + 4 earthquakes. The new earthquakes between 1.5 and 0.6 magnitude. Depths to 9.6, 10.6, 11.0, 11.5, 14.2, 16.2 and 33.3 km. yesterday 17. Yesterday 10. Today van 3. In total van 12397 earthquakes located in El Hierro by IGN from 9: 00 a.m. of the day 19 July 2011 (Henry).


http://www.avcan.org/Mapas/AVCAN2809.jpg?d=1330164604

[jand]

New earthquakes detected and localized yesterday and today by the IGN in the area of the island of El Hierro and vicinity since the last information note AVCAN:

1128420 24/02/2012 09:16:22 27.7219 -18.0284 11.5 1.5 mbLg SW FRONTERA.IHI
 1128438 24/02/2012 11:07:38 27.7772 -18.0524 14.2 0.6 mbLg NW FRONTERA.IHI
1128511 24/02/2012 20:31:11 27.7023 -18.0588 10.6 1.0 mbLg W EL PINAR.IHI
1128523 24/02/2012 23:46:54 27.6900 -18.0636 11.0 0.6 mbLg W EL PINAR.IHI

1128531 25/02/2012 04:09:36 27.7356 -18.0787 16.2 1.1 mbLg W FRONTERA.IHI
1128538 25/02/2012 05:47:35 27.7167 -18.0559 9.6 1.2 mbLg SW FRONTERA.IHI
 1128537 25/02/2012 08:00:13 27.7319 -18.0903 33.3 1.3 mbLg W FRONTERA.IHI

A esto hay que añadir los nuevos sismos localizados tras la revisión de los mismos por el IGN. de 4 de antesdeayer.

1128418 23/02/2012 14:21:10 27.7265 -18.0423 11.6 0.7 mbLg SW FRONTERA.IHI

1128428 23/02/2012 15:34:56 27.7471 -18.0360 9.0 0.7 mbLg W FRONTERA.IHI
 1128436 23/02/2012 16:14:21 27.7262 -18.0351 9.1 0.8 mbLg SW FRONTERA.IHI
 1128475 23/02/2012 16:53:52 27.7109 -18.0670 11.8 0.8 mbLg SW FRONTERA.IHI
5 hours ago · Like · 4

[jand]

Update 25/02 – 16:20 UTC
 - 7 earthquakes so far today
 - we have the feeling that the activity is increasing slowly. The faint jacuzzi is still visible on the webcam
 - we have just added 4 pictures from Joke. Click on the thumbnails below to watch them.

Update 25/02 – 13:20 UTC
 - 5 earthquakes so far today. Rather new is that 2 of these earthquakes has been located at a depth of 33 and 34 km.   Epicenter of both are below the island itself
 - the jacuzzi is back alive, faint  indeed, but just like yesterday it can well be seen on the eruption webcam, even with the sun glare of the afternoon
 - ER reader Sissel could not sleep well last night and recorded the webcam. Spooky lights are traveling the Las Calmas sea. The webcam operator, who is doing a great job, was focusing on the ship later in the night and created another eruption-like image. We are fearing now that when the real eruption starts, we might think it is the Ramon Margalef !

http://www.youtube.com/watch?feature=player_embedded&v=RHpoQzR0198

[jand]

Update 25/02 – 08:53 UTC
 - 3 earthquakes so far today. Magnitudes : 1.1, 1.2 and 1.3. All epicenters below land, but the locations are more and more to the Orcilla area (the lighthouse west of Tacoron).
 - no change in harmonic tremor
 - continuing micro-seismicity
 - no (webcam) visible stain this morning, although the haze over the vent area is still present
 - after the more intensive (and very detailed) geology course at La Restinga where Joke was informed about all geology aspects of the island, INVOLCAN will give an evening course at El Pinar on February 28, 29 and March 1. It looks a little silly to us that 2 different organizations are organizing a course almost at the same time.  A "light" version of the geology course which Joke followed should have been a great way of honoring the preparation work of Mr. Ramon Casillas Ruiz.
 - Each time some action is tgoing on near or above the vent(s), Involcan / Guardia Civil Helicopteres is present to make a detailed image / video / measurement report of what is going on

https://picasaweb.google.com/110327184570944806725/ElHierroFebruary252012?authuser=0&feat=directlink#

[jand]

The two earthquakes today that were 33 km deep on ER it was noted that each epicentre was actually under the islands itself.

http://www.ign.es/ign/layoutIn/volcaDetalleTerremotos.do

http://www.ign.es/ign/layoutIn/volcaDetalleTerremotos.do

[jand]

http://www.ign.es/ign/resources/volcanologia/html/eventosHierro.html

Position of all the quakes last ten days El Hierro.

[jand]

earthquake-report.com


Update 25/02 – 23:35 UTC
 - We have ended the day with 14 listed earthquakes. The latest 7 at depths varying in between 10 and 12 km.
 - Involcan / Guardia Civil helicopteres video from yesterday February 24

http://www.youtube.com/watch?feature=player_embedded&v=YzMysdFnIXg

[jand]

OT but volcano related.


lostiempos.com

A super volcano "grows" in the South according to scientists Bolivia

By Anf – agency – 25/02/2012

International scientists are studying the changes posed by Uturuncu volcano, located in Bolivia near the border between Chile and Argentina, since satellite measurements show that the mountain has been growing at a rate of 1.3 centimeters per year in the last two decades. This suggests that the mountain, whose last eruption occurred about 300,000 years ago, could be accumulating a new big bang.

Scientific information dates back to the Uturuncu as a semidormido volcano, because it presents Active fumaroles, and certain measures give a report that rises of 1 to 2 cm per year. With its 6.008 meters above sea level, is the highest in the South of Bolivia and the Department of Potosí.

It is close gaps of colors such as the Celeste lagoon, laguna Colorada and laguna Verde and the Salar de Uyuni. It is probably the mountain of more than 6,000 meters more easy to achieve in the world because of its geomorphological features.

"The size and longevity of the increase is unprecedented." "We could be witnessing the development of a new Super-volcano," said Kuprinka Silva, Oregon State University geologist who studied the Uturuncu, since 2006.

According to published newspaper The New York Times, the eruption of the Bolivian volcano, which has a population of 69 kilometers of rocky soil, could expel ash and pumice forcefully one thousand times larger than the 1980 eruption of Mount St. Helens in the State of Washington and is the worst event in the history of the United States volcanic.

It would also be ten thousand times greater than the eruptions that occurred in 2010 in Iceland, which for weeks paralysed international air traffic.

The planet has between 30 and 40 Super-volcanoes, only 10 of them are potentially active and Super eruptions occur only once every 100,000 years approximately.

It is believed that the last was in Sumatra when erupted volcano Toba, 74 thousand years ago. That event would have expelled ash in sufficient quantities to cause a "volcanic winter", with a duration of 6 to 10 years, a period of global cooling of a thousand years, and with a loss of life so great that the event could have changed the course of human evolution.

ERUPTION

Jacob B. Lowenstern, geologist and geochemical researcher at the geological survey of United States, told the same medium that by now "not you see no evidence of imminent eruption of a super volcano on Earth".

However, the gradual growth of the Uturuncu makes it fertile ground for his study. "Is like a tumor growing within the Earth and we must know whether it is benign or malignant," he declared Kuprinka de Silva.

The Uturuncu was already considered potentially active. There in the upper part of the slope, 2,400 meters are small holes in the ground with sulphur fumaroles that release hot gases, which are evidence of the existence of a source of heat close to the surface.

An international team of seismologists, geologists, geophysicists, and other experts for a research project called "Plutons" which studies the Uturuncu volcano was formed in 2009.

Reply

[jand]

Carlos B. says:

 February 26, 2012 at 13:24


A very interesting video about Cascadia (Juan de Fuca plate).
 NW United States (volcanic zone).
 If at California might be the Big one... Cascadia would be be the Mega One...

It is very interesting to see the instruments and plots used by scientists and that we can see in some moments of this video.




http://www.youtube.com/watch?feature=player_embedded&v=MXzQGWDbKEA

[jand]

Avcan FB Comment by Avcan

Today already have 10 earthquakes... and the strangest thing that did not happen almost since the month of July – August, it is like 9 of them have aligned themselves perfectly earthquakes today in the direction NNE-SSW from the border area to the mar de las Calmas crossing the area of summits and the slope of the Julan.(Enrque)

http://www.avcan.org/mapas/AVCAN2812.jpg?d=1330278209

EARTHQUAKES DAY 26 FEB. -Pink (10)
 EARTHQUAKES DAY 25 FEB. -Dark green (14)
 EARTHQUAKES DAY 24 FEB. -Blue clear (7)
 EARTHQUAKES DAY 23 FEB. -Red (14) – 5 new
 EARTHQUAKES DAY 22 FEB.

[jand]

Update 26/02 – 17:53 UTC
 - Strong degassing is currently going on
 - 6 more earthquakes and 10 in total. Depth in between 10 and 12 km
 - minimal harmonic tremor even with this strong degassing

[jand]

Denise says:

 February 26, 2012 at 19:36


Hi Judith – Just before you posted this I was looking at that pattern on the IGN and Avcan maps. In my very uninformed opinion I thought of two possibilities. One, we might be looking at an outline of Bob's feeder tubes that are now shutting down. But... I think that we cannot totally rule out new activity in the Tangansoga area. However, if that were the case there should be stronger earthquakes, and the tremor graph would show increase in pressure. In any case, I think it would certainly make everyone feel more comfortable it they were monitoring (and publishing) the gas measurements in that area.

Reply

http://www.avcan.org/mapas/AVCAN2812.jpg?d=1330278209

Ok I know the earthquakes have not been strong but as an outsider looking at that map IMO there is a message in there somewhere.
 These earthquakes are forming a pattern they are not happening haphazardly they are happening in positions of the island for a reason they are telling us something the burning question is exactly what are they telling us.

Reply


Carlos B. says:

 February 26, 2012 at 19:50


I´m agree
 And GPS should show us acelerated deformation too if this moment (before new eruption in that zone) arrived in the future.
 In the short time there are not big evidence for this yet... We must wait for new and greater evidences in the next days and future...

Reply

[jand]

dfmorvan says:

 February 26, 2012 at 20:43

Here are density Plotting of Jan and Feb (all depth included).
 Are things rotating to the west/N west ?

Seems that the EQ are moving inland ?

I changed the resolution to get a more dense picture.

Please feel free to comment

January

http://2.bp.blogspot.com/-auM7Qb8pYB4/T0qWR8FOmMI/AAAAAAAAA0E/6kijo4O_Le8/s1600/denpmap%2Bjan%2B%2B2012-02-26%2B21%253A24%253A44.png

Feb

http://1.bp.blogspot.com/-jQ9A6mBV7a0/T0qWSYFfbbI/AAAAAAAAA0Q/a8hVYMmyx2M/s1600/denpmap%2Bfeb%2B2012.png

does Joke has any info on site ?

[jand]

earthquake-report.com

Shortly before midnight a moderate but very shallow earthquake struck the French Southern Alps. The earthquake was felt from the Alps ski areas down to the French Mediterranean coast
"I have Felt it" Reports –> see below

We are very curious for the reports during daylight tomorrow. As the epicenter is right in the ski-areas in the French and Italian Alps, avalanches are very well possible, especially because of the huge amounts of snow currently in the area.

Update : The epicenter has been located almost on the Italy / France border. Some agencies are reporting the Italian side of the border being the epicenter,, others the France area.

Update: La terre a tremblé à Crévoux, à 16 km au nord est de Barcelonette, ce soir à 23h37 précises, selon le site du Commissariat à l'énergie atomique (CEA). Ce séisme de magnitude 4,9 sur l'échelle de Richter a été ressenti dans le Var, les Alpes-maritimes et même Marseille où de nombreux habitants ont senti la secousse durant 3 à 4 secondes. Il faut remonter à 1997 pour retrouver une amplitude équivalente dans cette région montagneuse des Hautes-Alpes. (source : LaProvence.com)

Update : The earthquake has also been felt very well in South Western Italy, from the Alps until the Mediterranean coast.

Update : The nearest villages are : Guillestre (10 km), Embrun, Chateauroux les Alpes and Jausiers.

Update : The EMSC numbers are annoying as they can implicate minor damage in villages close to the epicenter. Especially the extremely shallow depth of 2 km means that the shaking (explosion) must have been felt and heard hard by people in these villages.

Update : The other seismological agencies reported the following data :
 EMSC : Magnitude 4.8 and 2 km depth
 GEOFON : Magnitude 4.6 at 10 km depth

[jand]

There have been 3 more earthwakes since the 4.6 late last night .

The latest is a 3.3 at 07.11.

 http://www.emsc-csem.org/Earthquake/earthquake.php?id=256714

[jand]

http://www.emsc-csem.org/Earthquake/popup_intensmap.php?id=256660&f=/INTENSITY_MAPS/25/256660/AUTOMATIC/AreaThreshold_5/EMS_98__RMW_Musson/LocMethod_PerClusterCity/DynamicClusters_MaxSize50/IntensityMap.png

[jand]

volcano cafe copied

CarlosB says:

 February 27, 2012 at 17:40


Hi Alan CB... I knew this video I saw it many years ago in the spanish tv... hahaha

For GeoLurking, Carl and all...

This week:
 deformation
 In the last week, the deformation monitoring stations located in the Gulf
 show a slight trend towards the north in the horizontal components. the remainder
 stations and the vertical component remains stable.

2 weeks ago:
 deformation
 During the last week, the monitoring stations show a pattern of deformation
 stable in both horizontal components and a slight tendency to deflation in the
 vertical component of the stations outside the area of #8203;#8203;the Gulf.

What does it means?

An interesting short reading (resume) about other canary island... La Palma.

2008
 Editor:
 IEEE Geoscience and Remote Sensing Society (GRSS)

Citación :
 Second Workshop on Use of Remote Sensing Techniques for Monitoring Volcanoes and Seismogenic Areas, 2008. USEReST 2008, 5 pp.

Resumen :

We review several results from geodetic observations carried out in La Palma Island during the period 1992-2007. A gravity survey was done for structural studies, and InSAR and GPS observations techniques were applied to study the existence of deformation areas in the Island. Gravity anomalies have been inverted using a non-linear three-dimensional gravity inversion approach to obtain the geometry of the anomalous bodies. The main structural feature is a large high density body interpreted as a dense intrusive plutonic body and the pliocene-age uplifted seamount. An elongated minimum is detected below the Cumbre Vieja according to the rift structure. InSAR results show two areas of subsidence, a mild long wavelength signal on the western part of Cumbre Vieja and clear subsidence located on the Teneguia volcano where the last eruption took place in 1971. A GPS network composed by 26 stations covering the island has been defined. Vertical displacements determined by comparing the GPS coordinates obtained in 2007 and in 1994 are consistent with the InSAR results. From the comparison of 2006 and 2007 coordinates we conclude that more time span is needed to obtain clearly significant displacements, but observed trends are also consistent with InSAR results. All the observed significant displacements are at stations located outside of the large high density central body.

http://digital.csic.es/handle/10261/34113

[cllrcollins]

Zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

[jand]

IGN Graph of the 2.1 earthquake that happened earlier this afternoon EL Hierro.


http://www.02.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2012-02-27_15-16&estacion=CHIE&Anio=2012&Mes=02&Dia=27&tipo=2&hora=15-16

[jand]

CllrCollins

Its about time you stopped acting like a child .

Nobody is forcing you to read the posts simple solution to your boredom dont bother clicking in and reading if you are not interested and let the others who are interested continue reading without your dross appearing .

[jand]

Continuing Seismicity in the lineup of yesterday... Today most located in the border area, with an earthquake of 2.1 and another 1.8 which has been able to be felt by the population of border, to be just below the town.
1128983 02/27/2012 15: 38: 03 27.7459 - 18.0145 13.9 2.1 mbLg SW border.IHI



EARTHQUAKES DAY 27 FEB. -Violet (
EARTHQUAKES DAY 26 FEB. -Pink (12)
EARTHQUAKES DAY 25 FEB. -Dark green (14)
EARTHQUAKES DAY 24 FEB. -Blue clear (7)
EARTHQUAKES DAY 23 FEB. -Red (14) - 5 new
EARTHQUAKES DAY 22 FEB. -Yellow (17) - 10 new


In fact made yesterday one as eastbound...
1128614 26/02/2012 03: 26: 48 27.7079 - 18.0499 7.1 II 1.4 mbLg W EL PINAR.IHI



http://www.01.ign.es/IGN/IMG/sismologia/sentisismo2.gif

[cllrcollins]

Maybe I was being a bit judgemental, there is a place for people like you.

http://answers.yahoo.com/question/index?qid=20120224211213AAXaBXc

[jand]

Avcan FB Comment

Curve evolution of energies, continues its in their guns... After a few quieter days, returns to the fray with more release of energy to follow the slope... at the moment only continue as we go up or down... continue equal.. (Enrique)http://www.avcan.org/sismica/graficas/G865.jpg?t=1330365701)


http://www.avcan.org/sismica/graficas/G865.jpg?t=1330365701

[kevin2003]

Never mind the horrid little Irish man Jand.[] Keep up the good work.

You wouldn't happen to be single,hot and on Facebook by any chance...?[]

[jand]

Avcan FB Comment

Araceli... activity is different, now seems to have a more tectonic component, isn't so diffuse or open as other days, is much more aligned along a fissure, dike or fails, is simply that progresses to the NNE, yesterday started in the julan district and was climbing towards the Summit area and today has fallen towards border (Henry)

Maite, so is... how much more energy follows the system, more dangerous becomes because it indicates that it progresses to something... now it is low to very low and it is just releasing a more or less constant rate over time who tells us that the system is still active, that is to say it somehow "live" can move and upload your activity or stand up and down its activity... We can only wait and see what it does...(Henry)

Reply

[kevin2003]

I'll take that as a no.[][]

[jand]

Maybe thirty years ago when I had a figure the same and looked liked this the answers to all would have been Yes Yes YES!!!!!