El Hierro

[jand]

Avcan FB Comment .

Good night. For the island to double its size – which is located above sea level – only should be many eruptions and a volcanic edifice similar to the Orchilla or the Calcosas mountain, with the formation of lajiales such as Orchilla and La Restinga had formed over many years – hundreds of thousands – with what is coming out by the calm sea. If eruptions had repeated over time, in the same place, could generate a volcano as the Tanganasoga. (Elena)
 7 hours ago · Like · 20

Volcanic Canary Islands (AVCAN) Manuel today... the teneguia expelled some 40 million cubic metres or and the latter figure was 145 million cubic demetros January 10 by the volcano in la Restinga... more than 4.5 Teneguias... almost nothing and without bringing the last month...

Chimanadas-... for the moment the more striking is the concentration of earthquakes in the vertical and its evolution to be more shallow., which is very difficult to know that is due... If you concentrate on the vertical and the horizontal... We would have a presurizacionn... but if we increase the scale think is that... a pressurization along the duct.

at this point there are two working hypotheses that I am raising:

1 – that the magma is more dense and with highest percentage of crystals or crystallinity to do so more viscous, misfeeds and solidify with more ease and run the eruption... on time generating more seismicity, low magnitude, less than 2.5, occasionally something higher.

2 we are before a new eruptive phase and it is entering new magma from the depths... but this case will come accompanied by something more of seismicity, but with that 3.2 is already a principle, and would be something normal on a principle of a pressurization, which is why I give more possibilities to this working hypothesis.

The only thing you can do is see if you towards one side or the other depending on what we have these next hours and days, and we will see what makes.

[jand]

Avcan FB Comment from Avcan

The volcano in La Restinga shuts down, as shown in the tremor and the actividasd surface. Clearly the increase in seismicity, yesterday 23 and today go 9, each time with more shallow earthquakes. The magma is still moving and climbing. After almost seven months of seismic activity, I do not believe that you for the possible opening of a new mouth, perhaps not far away from the current, do not need a large-scale seismicity. The rock must be pretty crushed. The increase in the number of events and more shallow, may be enough indication for the eruptive revival, without the need to wait for the necessary form, at the time of the process that we are, the big earthquake of shot.
See Translation


23 minutes ago · Like · 2

[jand]

Update 16/02 – 10:16 UTC
 We want to share in this main window the comment Javier from SOS Oceanos made in our comment section.
 - The research vessel "Atlantic Explorer" from the company "QSTAR" that has been colaborating in our marine protection projects "SOS OCEANOS", left early this morning the island of Gran Canaria heading to El Hierro island. Together with the Geology http://www.gi.ulpgc.es/geovol/ and Oceanography department´s of the University of Las Palmas de Gran Canaria they will make several campaigns in the next months (two days campaigns every two weeks) in the area of volcanic eruption on the island of El Hierro. Onboard R/V"Atlantic Explorer" there´s a ROV system and if the conditions are ok they will try to reach the volcano.





Update 16/02 – 08:56 UTC

- the HT signal is slightly increasing again with a prompt jacuzzi in the Las Calmas sea

[jand]

http://www.gobiernodecanarias.org/cmayot/calidadaire/tiemporeal.jsp

Increase in gas emmisions.

[jand]

Avcan Fb

Again last night was another earthquake in the same position as before between Tenerife and Gran Canaria it is mentioned this is happening now every week.

And last night shortly before midnight Canarian... a sismito of 1.4 in the area of the volcano of middle vary... This also moves as every week.(Henry).


1126858 15/02/2012 23: 46: 21 28.0983 - 16.1768 26.7 1.4 mbLg ATLÁNTICO-CANARIAS -

[jand]

Update 16/02 – 14:28 UTC

 - HT gradually dying again
 - Stain still visible but getting fainter and fainter
 - 16 earthquakes so far today ! The earthquakes are (if confirmed) shallower than during the earlier days. The 7 km depth looks to be confirmed by IGN which is a serious decrease vs the average 11 to 12 km from the last couple of weeks.

[jand]

Update 16/02 – 16:32 UTC
 - 6 more earthquakes bringing the total on 22 today – a 2012 record is in the making
 - 4 more pictures of the jacuzzi which started this morning at approx. 09:00 and is still continuing. As seen from the webcam mainly degassing is going on.
 - (Horizontal) GPS data are fairly stable at the different El Hierro stations. Vertical GPS data (lifting of the island) are not open source.

[jand]

Update 16/02 – 20:07 UTC
 - 5 more earthquakes making it a record number since late November. We will probably arrive at +30 earthquakes today.  All the earthquakes are very weak with the majority below M 1.0
 On top of the listed earthquakes are a lot of micro-earthquakes, too small to list but showing the continues pressure from the magma to find his way to escape.

Update 16/02 – 16:32 UTC
 - 6 more earthquakes bringing the total on 22 today – a 2012 record is in the making
 - 4 more pictures of the jacuzzi which started this morning at approx. 09:00 and is still continuing. As seen from the webcam mainly degassing is going on.
 - (Horizontal) GPS data are fairly stable at the different El Hierro stations. Vertical GPS data (lifting of the island) are not open source.

[jand]

OT but very interesting about Solar Storms.

http://www.youtube.com/watch?v=7swOhclv7CI&feature=player_embedded#!

[jand]

http://eruptionelhierro.blogspot.com/2012/02/new-density-plotting-of-eq-with-maps.html#!/2012/02/new-density-plotting-of-eq-with-maps.html

[jand]

Note 452 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 17 February 2012-9: 15 pm peninsular - earthquake and volcanic activity continues today moderate, with seismic activity in the area of summits, at the height of the Tanganasoga towards the Julan and East coast of the Julan. Also see microsismicidad detected but not located in the spectrogram. The signal of volcanic tremor continues in the eruptive area of la Restinga, takes 5 days down without stopping, although yesterday repunto something, continues downward and already is barely noticeable in the spectrogram.New 26 earthquakes. Magnitude between 0.2 and 1.5. Depths between 7.1 and 12.3km (and one 2.7km and other four to 15.2, 15.6, 15.9 and 16.0km). The day before yesterday 23. Yesterday 30. Today van 5. In total van 12277 earthquakes located in El Hierro by IGN from 9: 00 a.m. of the day 19 July 2011 (Henry).


http://www.avcan.org/Mapas/AVCAN2743.jpg?d=1329463918

[jand]

Nuevos sismos detectados y localizados ayer y hoy por el IGN en la zona de la isla de El Hierro y proximidades desde la última nota informativa AVCAN:

1126900 16/02/2012 08:12:11 27.7026 -18.0861 10.8 0.7 mbLg SW FRONTERA.IHI
1126902 16/02/2012 08:20:37 27.7061 -18.0796 11.2 1.2 mbLg SW FRONTERA.IHI
1126903 16/02/2012 08:43:49 27.7046 -18.0705 12.3 1.4 mbLg W EL PINAR.IHI
1126927 16/02/2012 11:11:47 27.6652 -18.0432 7.1 1.1 mbLg SW EL PINAR.IHI

1126941 16/02/2012 11:11:58 27.6777 -18.0307 7.3 1.2 mbLg SW EL PINAR.IHI
 1126970 16/02/2012 12:14:23 27.6904 -18.0633 11.0 0.5 mbLg W EL PINAR.IHI
1127001 16/02/2012 12:52:17 27.6538 -18.0578 6.8 1.2 mbLg SW EL PINAR.IHI
 1127007 16/02/2012 13:01:01 27.7537 -18.0696 15.2 1.5 mbLg W FRONTERA.IHI
 1127009 16/02/2012 13:02:57 27.8471 -18.0506 2.7 0.9 mbLg NW FRONTERA.IHI 12260

1127011 16/02/2012 13:05:24 27.7174 -18.0488 11.6 0.8 mbLg SW FRONTERA.IHI
1127013 16/02/2012 13:18:43 27.7404 -18.0605 15.6 0.7 mbLg W FRONTERA.IHI
1127015 16/02/2012 14:36:59 27.7180 -18.0163 12.4 0.6 mbLg W EL PINAR.IHI
1127016 16/02/2012 15:15:21 27.7556 -18.0487 15.9 0.2 mbLg W FRONTERA.IHI
1127018 16/02/2012 15:38:42 27.7094 -18.0393 16.0 0.7 mbLg W EL PINAR.IHI

1127019 16/02/2012 15:42:03 27.7536 -18.0366 10.6 0.9 mbLg W FRONTERA.IHI
1127020 16/02/2012 16:54:16 27.6525 -17.9966 0.8 mbLg SW EL PINAR.IHI
1127021 16/02/2012 17:07:38 27.7119 -18.0802 11.8 1.0 mbLg SW FRONTERA.IHI
1127049 16/02/2012 18:07:05 27.7194 -18.0480 11.4 0.3 mbLg SW FRONTERA.IHI
 1127047 16/02/2012 18:53:36 27.7232 -18.0603 8.0 0.9 mbLg SW FRONTERA.IHI 12270

1127048 16/02/2012 19:11:41 27.6774 -18.0502 9.7 0.7 mbLg SW EL PINAR.IHI
1127060 16/02/2012 20:19:23 27.7379 -18.0583 12.3 1.0 mbLg SW FRONTERA.IHI

1127071 17/02/2012 00:26:43 27.7276 -18.0525 10.1 1.3 mbLg SW FRONTERA.IHI
 1127073 17/02/2012 01:28:20 27.6930 -18.0499 11.2 1.4 mbLg W EL PINAR.IHI
1127074 17/02/2012 02:10:44 27.6920 -18.0614 12.0 1.2 mbLg W EL PINAR.IHI

1127077 17/02/2012 05:38:49 27.7096 -18.0672 10.7 1.5 mbLg SW FRONTERA.IHI
1127078 17/02/2012 05:41:08 27.7213 -18.0653 11.7 0.7 mbLg SW FRONTERA.IHI

14 minutes ago · Like · 3

[jand]

Terremoto de 2.5 que ha podido ser sentido en la isla y con epicentro en la zona marina de Cala Tacorón. Si lo habeis sentido acordaros de rellenar el cuestionario del IGN, es muy importante (Enrique)

1127181 17/02/2012 13:16:54 27.6759 -18.0445 12.4 2.5 4 SW
EL PINAR.IHI

http://www.ign.es/ign/#8203;layoutIn/#8203;geofisicaCuesmaCuesmaTerremotos#8203;.do

Earthquake of 2.5 that could be felt on the island and with its epicenter in the Pinar Cala marina area. If what you have sense to remember to fill the questionnaire of the IGN, is very important (Henry) 1127181 17/02/2012 13: 16: 54 27.6759 - 18.0445 12.4 2.5 4 SW EL PINAR.IHI http://www.ign.es/ign/layoutIn/geofisicaCuesmaCuesmaTerremotos.do (Translated by Bing)

[jand]

Since then return to align NNW-SSE on the map, which are from the Gulf Coast, passing through the Tanganasoga, down the Julan, passing from Pinar Cala and reaching the area of eruption of la Restinga...(Henry)


http://www.avcan.org/Mapas/AVCAN2754.jpg?d=1329488649

[jand]

This is the boat that has been on the stain today.

Araceli, entra en la página web de http://#8203;www.sos-oceanos.org/ y entenderás porque... Son una organización sin ánimo de lucro, como AVCAN.

Araceli, comes into the web page of http://www.sos-oceanos.org/ and you'll understand because... They are an organisation without profit, as AVCAN. (Translated by Bing)

[jand]

http://www.youtube.com/watch?feature=player_embedded&v=UizPBG4mzqg

Video In English About Yellowstone.

[jand]

http://www.youtube.com/watch?feature=player_embedded&v=UizPBG4mzqg

Video In English About Yellowstone.

[jand]

Update 18/02 – 13:21 UTC
 - 9 listed earthquakes since midnight
 - HT almost no change but still rich on microseismicity, which may lead to renewed visible activity in the vent area
 - with the current sunlight it will be hard to see any action in the Las Calmas sea

Update 18/02 – 08:48 UTC
 - Our title "Did the eruption (in the current vents) stopped completely ?" is based on a number of parameters like :
 * very minor harmonic tremor, in a way that we have not seen since long
 * no more visible degassing of the main vent
 * no jacuzzi
 * no visible or hard to see stain on the webcam
 - Do we mean with these words that everything has stopped ? NO, not at all, but we only think that the currents vents may have been collapsed in a way that almost NO magma flow is occurring.
 - Since midnight IGN has listed 7 earthquakes, all of them below the island itself or in the Las Calmas sea. This indicates that the magma is still trying to find his way to the surface.  If the vent does not reopen, the earthquakes may rise again in number or strength (with a new uncertain and risky phase) or the volcano is throwing his towel in the ring  (proverb) and the activity will stop for now. Next week will be once more decisive!
 - We saw the Atlantic Explorer leaving the port of La Restinga about an hour ago.

[jand]

There have been nine earthquakes already today eight of them have been over 1.2 in strength .

[jand]

Note 453 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 18 February 2012-11: 00 pm peninsula - earthquake and volcanic activity continues moderada-alta, yesterday with a 2.5 in the calm sea, and like yesterday with seismic activity in the area of summits, at the height of the Tanganasoga towards the Julan and the mar de las Calmas. In the area of the Gulf, also yesterday there was activity, with one at sea. Continuous played quite microsismicidad detected but not located in the spectrogram. Continues the signal of tremor volcanic eruptive area of la Restinga, although it continues to decline with 6 days down without stopping, although yesterday I repunto something momentarily, it continues downward and already barely is noticeable in the spectrogram. New 19 earthquakes. Magnitude between 0.7 and 2.5. Depths between 9.6 and 12.7km (and a 13.9km). 30 Day before yesterday. Yesterday 17. Today go 7. In total van 12296 earthquakes located in El Hierro by IGN from 9: 00 a.m. of the day 19 July 2011 (Henry).


http://www.avcan.org/Mapas/AVCAN2763.jpg?d=1329558704

[jand]

Sr Jose Luis barrera Translated

The eruption of La Restinga has not ended. The seismic crisis, either. For several days, the submarine volcano emits few gases and pyroclastic fine, giving signs of exhaustion. He has been doing it for days. However, the seismic activity has increased moderately, to spend some days at more than 20 earthquakes and, what is more worrying, with hipocentros in shallow waters and in the area of weakness n-S of the Tanganasoga volcano and slopes of the Julan (Garañones).
The magma is still moving below the mar de Las Calmas but migrates towards the Julan, leaving the mouth (bocas) Eruptive practically inactive. There is a tendency to magma focus in the area of Garañones where there is volcanic activity postdeslizamiento on surface and also under the Sea (see attached diagram). It is not so strange the underground magma circulates in these coordinates (Julan – El Golfo), as it has been doing for some few hundreds and thousands of years is, in geological time, soon. It is comparatively the preeruptive situation which had before the eruption of the October 10, 2011. Not to be ruled out as a possible eruption on the slopes of El Julan if you increase the seismic crisis and the continuous magma pressing below.

New bathymetric images of the Ramon Margalef ship are quite defining underwater volcano situation (see attached image). There is one main cone with a crater at 120 m (because that it wasn't supposed to be in less depth than the 130 m) and another minor adventitious, grown recently, with the 200 m deep crater. There is the large volume of material issued and slipped on the slopes at 2,000 meters in the ocean floor. With this position leaning of the base of the main building, does not seem possible in vertical growth, and much less to reach emerge.

What is missing are data petrologic samples periodically arise on the surface of the sea and that they have been collecting for salvamente maritime. Several months have passed and the data that should provide the CSIC are not yet available; We do not know the reasons for the delay, which prevents know the composition of the magma that emerges and hence the geochemical evolution of the eruption. Also we still do not know the composition of the emitted gases. When will we have these data?

Continue pending the new seismic crisis which is which can give us more information and concern.

These are my impressions but we can not say ever, still, that he will not leave magma by the submarine volcano.

Reply

[jand]

In Tenerife: Magnitude ML 3.3
 Region CANARY ISLANDS, SPAIN REGION
 Date time 2012-02-18 13:28:54.4 UTC
 Location 28.09 N ; 16.35 W
 Depth 31 km
 Distances 43 km S Santa cruz de tenerife (pop 222,190 ; local time 13:28:54.4 2012-02-18)
 20 km SE Santa Úrsula (pop 12,582 ; local time 13:28:54.4 2012-02-18)
 16 km SE Arico (pop 7,189 ; local time 13:28:54.4 2012-02-18)

Reply

[jand]

http://img7.imagebanana.com/img/6jouhh1u/terremototenerife.png

[jand]

http://www.01.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CCAN_2012-02-18_13-14&estacion=CCAN&Anio=2012&Mes=02&Dia=18&tipo=2&hora=13-14

[jand]

Update 18/02 – 18:12 UTC
 - 12 earthquakes so far today. The 3.3 earthquake was along the coast of Tenerife and is probably tectonic
 - HT unchanged
 - When the camera was zooming in the Las Calmas sea we could see some minor stirring for a couple of minutes, proving what we told this morning that we have still some minor surviving action

[jand]

It has been confirmed the 3.3 was felt on Tenerife by IGN.

http://www.geo.ign.es/ign/head/sismoDetalleTerremotos30Spain.do?evid=1127366

Reply

[jand]

http://www.01.ign.es/ign/resources/volcanologia/jpg/histograma_HIERRO_2011_10.jpg

Graph of all the earthquakes in the last ten days El Hierro.

[jand]

Joke was at the CAP center this afternoon and was authorized to show this big screen (in fact a computer screen projection on the wall). This is what the CAP scientists and personnel are seeing when we get an almost flat HT graph. The picture was photographed earlier today. Of course to see every detail, the picture is heavily zoomed. What we seen is however very weak HT. The bigger amplitudes (a lot of them in some stations)  are microseismicity (weak earthquakes not listed by IGN)

[jand]

Update 18/02 – 23:17 UTC
 - 21 earthquakes today, less than yesterday, but still enough to call it active
 - HT hasn't changed almost all day
 - The Atlantic Explorer could not use his ROV today due to the weather. The ship has navigated along the coast and later deeper into the sea. It has mainly sampled the bottom were it has found a lot of ash, even away from the cone (probably because of the strong currents).  It took the staff about an hour to sample at a depth of 1120 meter. To pull it up another 30 minutes.  They had planned to use nets to catch fish close to the vent but could not accomplish this beacause of the rough sea. The crew also said that they have not seen any stain today (we neither).
 A long day for the crew as they left the harbour at 08:00 and returned at 20:00, this to use the authorized time frama as much as possible.
 The first mission of the ship comes to an end (it was authorized to be 2 days in the forbidden area) and it has to return to  Gran Canaria. The people from the Universityof Las Palmas de Gran Canaria will not return with the ship but probably by plane. The Atlantic Explorer is scheduled to be back in approx. 2 weeks for a new campaign.

[jand]

The latest 1.7 earthquake was in the middle of the island near Tanganasoga.


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