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El Hierro

Started by admin, October 12, 2011, 10:40:14 AM

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jand

#3330
October 07, 2012, 05:22:51 AM
There have been 17 EQ'S since midnight and 8 of them have been near Tenerife .

It looks as if a new swarm is starting near Tenerife aswell in different parts of the island .??

1168922  07/10/2012  00:49:49  28.2723 -16.7508  48 1.7 3  SE SANTIAGO DEL TEIDE.ITF

1168943  07/10/2012  00:50:58 28.3067 -16.8173   54  1.1  3  NW SANTIAGO DEL TEIDE.ITF

1168927 07/10/2012   00:59:30 28.4420 -16.8504   58  1.2  3  N BUENAVISTA DEL NORTE.ITF

1168939 07/10/2012   01:01:28 28.4257 -16.8517   73  0.8 3  N BUENAVISTA DEL NORTE.ITF

1168941  07/10/2012  01:13:50 28.3686  16.8851    72   0.8  3  W BUENAVISTA DEL NORTE.ITF

1168942 07/10/2012   01:25:20 28.3747-16.8650     60    1.0  3 W BUENAVISTA DEL NORTE.ITF

1168935  07/10/2012  02:01:39 28.3207 -16.7965    48    1.2 3 NE SANTIAGO DEL TEIDE.ITF

1168950  07/10/2012  02:03:20  28.1400  -16.6811  61    1.0 3 N ARONA.ITF

jand

#3331
October 07, 2012, 08:55:17 AM
On this map from Avcan the purple circles show all the earthquakes since midnight on Tenerife.

http://www.avcan.org/mapas/AVCAN4725.jpg?d=1349595196

jand

#3332
October 07, 2012, 11:46:41 AM Last Edit: October 07, 2012, 11:48:25 AM by jand
Just posted on the avcan Facebook page translated.

,,Many LPs in the graphics herrenas in these last hours. No doubt something fluid is moving and at more shallow depths that those reflect the registered events. The reason is very simple, an LP can be located accurately in its approach if lacks a seismic array full and very trained, thing that I have serious doubts have now. So will have to rely on other elements more worldly and less scientific, as the sounds, smells, vibration, dizziness, taste of the water, bugs, etc... that can help us in early precursors to any eruption. Undoubtedly, when this becomes more evident, will be accompanied by very steady microseismicity and at more shallow depths strongest signals, between 1 and 3 km on average. At this time, and after seeing the appearance of seismic swarms deep under the dorsal West of Tenerife and some events under La Palma, as well as others in other islands or deep in the ocean next to the Canary Islands, seems to me much more important that we have an optimal warning seismic network, supplemented with other gas metering stationsas well as a geodesic network independent and up-to-date at the moment, to ensure at least from the point of view of science, makes every effort to monitor, study and prevent the risk inherent in the volcanic orogeny of our archipelago. I think that we do not have this, neglect of the administrations, that is very clear, but all administrations, the here and the there. We cannot allow that press is always to 3,000 kms because the worst when you get the time is late for some. We need now more than ever, that all accept the volcanic reality of Canary Islands and the risk that the risk, which is now more danger than ever that neglect, lack of means, by the manifest stupidity of many politicians that hides the head under the wing waiting for others to come to the problem. Now more than we should never promote the definitive establishment of the volcanological Institute Spanish in the Canary Islands, as the seat of the INVOLCAN and of the Spanish society of volcanology, that cake not only the media but above all to the scientists who understand about this exciting science and will help us to better understand what is happening, reducing this now latent danger with the correct estimate of risk. And the National Center to file in the Canary Islands, and has to be dependent or under the aegis of the Canary, with the collaboration of all the Councils, local authorities, and must have full support of the central, its Ministry of public administration, so that all means put at the disposal of the Centretechnologies and knowledge that are now available. If you do not seize this moment, rather than by the vital urgency that behaves as an opportunity for the future, we are blind and deaf when that time comes we will stay composed and no girlfriend, losing the best of chances to grow scientifically and provide reasons for the use of our condition of volcanic Earth face to our visitors or our own people. Please, do not let escape again that train, perhaps never again never go here. Thanks to AVCAN for allowing to express myself this way.,,

jand

#3333
October 07, 2012, 11:51:14 AM
,,Geological and geomechanical models help to explain the formation of the valleys of La Orotava and Güímar 16-08-2012 the work done by scientists from the INVOLCAN and the IGME has been recently published in the international scientific journal Journal of Vulcanología & Geothermal Research panorama of the Valley of La Orotava, whose origin this related processes related to large gravitational landslide scientific of the volcanological Canary Institute (INVOLCAN) and the geological and mining Spain (IGME) have been investigated for the first time the geological and geomechanical characterisation of the succession of volcanic rock mass affected by the mega-landslide that gave rise to what we know today as the valleys of La Orotava and Güímar. The results of this research have been published recently by the international scientific magazine Journal of Vulcanología & Geothermal Research. The volume of subaerial volcanic material that I collapse or slipped to form each of the valleys has been estimated in the order of 30-50 km3. Geological research work carried out in surface as well as underground through the existing galleries and a new survey by research carried out allowed to identify the main types of materials and their structural readiness. A geological model of the volcanic edifice pre-deslizamiento providing a paleo-morphological reconstruction was prepared on the basis of this information. The geomechanical characterisation of the materials that formed the pre-deslizamiento building was obtained from field data, probes and testing laboratory as well as through the review of scientific articles related to this topic. The geological and geomechanical models obtained constituted the fundamental basis to explain processes of instability generated by the mega-landslide that shaped the valleys of La Orotava and Güímar. The proposed models have been manufactured through the use and application of modelling geomechanical in order to evaluate the influence of the different factors involved in the processes of instability and understand the causes and the mechanisms that caused landslides which generated the valleys of Güímar and La Orotava, in the same way that has been done in other volcanoes around the world. The influence of triggers that generate this type of mega-landslides such as eruptions or earthquakes were assessed by applying the proposed models and taking into account the different stages in the analysis of stability. In this case, as in the mega-landslide that occurred in Hawaii, seems to be that the hialoclastitas (material of volcanic origin, rich in volcanic glass formed in eruptions under water) are a key factor to promote processes of instability due to its characteristics and properties of low resistance. Scientific publishing authors inferred that a rupture mechanism characterized by the occurrence of successive landslides, that could have begun on the underwater submarine flank of the volcanic edifice conditioned by the presence of the weak and little consolidated hialoclastitas, could have played an important role in the generation of the valleys of La Orotava and Güímar. Many of the world's volcanoes have undergone large gravitational landslide affecting part of the volcanic edifice during its geologic history. This process of instability is related to the rapid growth of the volcanic edifices, especially that of the island volcanic edifices, and part of its natural evolution..,,

www.facebook.com   AVCAN

jand

#3335
October 08, 2012, 06:52:26 AM
Enrique from Avcan has stated that :

The graphic evolution of the depth of the earthquakes from 20/09/2012, are clearly two areas of activity at 10-20 km.


http://www.avcan.org/sismica/graficas

jand

#3337
October 09, 2012, 12:01:14 PM
On the Avcan Facebook page there is a discussion at themoment about the erruption in 1982 of the Chichon Volcano in Mexico where the goverment thought that decreased activity meant there was no danger of an erruption.

,,During one week (28 March-4 April 1982), three powerful explosive eruptions (VEI 5) of El Chichón Volcano caused the worst volcanic disaster in Mexico's recorded history. Pyroclastic flows and surges obliterated nine villages, killing about 2,000 people, and ashfalls downwind posed socio-economic hardships for many thousands of inhabitants of the States of Chiapas and Tabasco. The unexpected and vigorous eruption of 28 caused a hasty, confused evacuation of most villagers in the area. Activity was greatly diminished the next five days, and then the most powerful and lethal eruptions occurred 3-4 April—tragically, after many evacuees were allowed by authorities to return home. Unfortunately, the eruptions came as an almost total surprise for scientists and government authorities, effectively precluding opportunities to implement timely mitigative countermeasures. During the months before eruption onset, fumarolic activity increased and inhabitants living close to the volcano felt occasional earthquakes, prompting the Chiapas government to request help from the Federal government. Both the Chiapas and Federal governmental actions were slow, and the requested assistance came after the volcano erupted. Perhaps the most important lesson learned from the disastrous outcome at El Chichón is that its decreased activity (29 March-2 April) should not have been assumed by the senior scientist on site—and the military authorities acting on his advice—to signal the end of eruption. While the 1982 eruptions caused a national tragedy, they also fostered multidisciplinary studies of eruptive phenomena, not only at El Chichón but also other explosive volcanoes in the world.,,

http://repositoriodigital.academica.mx/jspui/handle/987654321/12653

jand

#3338
October 10, 2012, 10:37:22 AM Last Edit: October 10, 2012, 10:39:36 AM by jand
It looks like the strongest earthquakes  this morning at  2.0 at shallow depths of approx 10 kms are happening in the North of the island at Zona de  Cumbres.

,,
Hoy en cambio, seguimos ahi, con sismicidad en la zona central de al isla, tanto esta madrugada como ayer tarde a una profundidad de unos 20km..

menos el de las 7:16 que es a 10.6km y es el azul del Norte, casi en la zona de cumbres. ( Enrique)

,,Today on the other hand, are still there, with Seismicity in Central of the island, both this morning and yesterday evening at a depth of about 20 km... less than the 7: 16 that is to 10.6km and the blue of the North, almost in the Summit area. (Enrique),,

http://www.avcan.org/mapas/AVCAN4773.jpg?d=1349859795

SISMOS del 10/10/2012 - Azul Claro (3)
SISMOS del 09/10/2012 - Verde Claro (6)
SISMOS del 08/10/2012 - Rosa (4)
SISMOS del 01/10 al 07/10/2012 - Amarillo (85)

18 minutes ago · Like · 7..

Actualidad Volcánica de Canarias (AVCAN) y uno mas recien salido del Horno, en la zona de cumbres..(Enrique)..

1169573 10/10/2012 08:49:04 27.7369 -18.0301 12 2.0 4 SW FRONTERA.IHI

jand

#3339
October 10, 2012, 11:15:48 AM Last Edit: October 10, 2012, 11:23:55 AM by jand
Eduardo Villalba has just posted this on the Avcan FB Page Translated.

,,I  remember very well on October 10 last year, when us desayunabamos with a strange signal that had never been seen in the seismographs in the Canary Islands, and was of a harmonic tremor, which was then confirmed as the source of the eruption, remember very well the uncertainty of those days because the tremor did not stop increasing until the 12th opened the two hydrants closest to the coast, prolonging the fissure, the truth is that it was a real luck, a lottery, because it was not known if the crack is could prolong more near the coast or even on the ground, since these cracks may open up to several Km away from its original point, said a luck that will stay in a harmless for the population point,,

,,And speaking of luck, nature has loved, for now, there is a second eruption, even entering more of magma in the last year, but the last 3 magma intrusion, although they have begun to similar depths, have taken different paths, and achieved progress to dimensions more shallow (9-12 km.) in the two latest intrusions, but both has cut off the supply failure allowing them to follow above, and my question is what if there is a new strong magma intrusion, and although it starts around 20 km., it does not tour a new road, and follow the road already walked by one of the latter and giving it the necessary strength to one of two shallow swarms that are currently? For my is this happens, and taking into account the pressure that there is accumulated, would significantly increase the chances of a new eruption,,

jand

#3340
October 10, 2012, 11:21:18 AM
This morning the shallow 2.0 earthquake is slap bang in the middle of Tangangasoga.


1169573  10/10/2012  08:49:04  27.7369  -18.0301  12   2.0   4  SW FRONTERA.IHI

http://www.02.ign.es/ign/layoutIn/volcaDetalleTerremotos.do

jand

#3341
October 10, 2012, 12:35:21 PM
For those of you that speak Spanish a link for a radio interview this morning.

,,Entrevista a los alcaldes,de Valverde,El Pinar y de Frontera esta mañana en la radio autonomica.... sobre lo que pasa en la isla y sobre la crisis sismico-volcanica de la Isla del Hierro,a partir del minuto 85:00
http://www.rtvc.es/television/diferido.aspx?

id=7493&fichero=7493_BDC_1_101012.mp3.Interview with the mayors of Valverde, El Pinar and border this morning on the radio autonómica... on what happens on the island and on the crisis seismic-volcanic island of Hierro, from the minute 85: 00 ,,

http://www.rtvc.es/television/diferido.aspx?id=7493&fichero=7493_BDC_1_101012.mp3.(

jand

#3345
October 12, 2012, 12:04:14 PM
As regards the activity in the island of El Hierro, today there is no new sismoslocalizados, although note much microseismicity in the senosr of CHIE and any detected low magnitude that looks like a vertical stripe in the spectrogram (08:33utc) (Henry)

http://www.ign.es/ign/resources/volcanologia/CHIE/imagenes_sismica/HORA_SP/CHIE_2012-10-12_08-09_sp.jpg

www.facebook.com   AVCAN

jand

#3346
October 12, 2012, 12:11:56 PM
Interesting Article part below:

,,The "sleeping giants" of the world can wake up much faster than previously believed, according to a new model volcanic .

Scientists believe that the magma chambers (or molten rock deposits) are below the inactive volcanoes are filled with a sticky, viscous paste.

For a volcano "wakes", must be a certain amount of magma, newly formed and very hot coming out of the depths of the Earth to heat the pasta.

According to current theory, the heat would take hundreds of years, or even thousand, to be distributed by the entire Chamber and heat magmatic fluid enough to cause a rash.

However, a new model, based on fluid dynamics, shows that the hot magma from the depths can be mixed with the sticky paste and old much more easily than was believed, say scientists.,,


http://www.nationalgeographic.es/noticias/medio-ambiente/desastres-naturales/volcanes-durmientes-los-mas-peligrosos

jand

#3347
October 12, 2012, 16:12:36 PM
There has been a 2.6 mg earthquake El Hierro it shows on EMSC world map.


http://www.emsc-csem.org/

1169884 12/10/2012 12:45:00 27.6916 -18.0169 20 2.6 4 SW EL PINAR.IHI
  • info

jand

#3348
October 12, 2012, 18:46:47 PM

jand

#3349
October 13, 2012, 07:03:28 AM
,,The past 11/10 on the first day of program Cientifco of MAKAVOL - iron one communications seems of particular interest to focus one of the most important issues related to the volcanism: the management of the volcanic risk. A summary of the talk of Henry Gaudru with the title global approaches for the mitigation of the island S risk in VOLCANIC we hung waiting for the publication of the texts. Thanks to Amelia Ramos have put the link above to the journalistic news in http://www.eldia.es/2012-10-12/canarias/321-Riesgo-volcanico-gestion-Islas.htm stress in capital letters in the text those ideas that consider us very important although the full text has no waste. VOLCANIC RISK AND ITS MANAGEMENT IN THE ISLANDS. Our archipelago has a number of peculiarities that make it unique and a very differentiated from the continental territory. And is that we are Oceanic Islands, Yes, but also volcanic. This uniqueness, known by all those who live in this wonderful land, NO is however CALIBRATED in terms relating to management of the risk derived from the nature VOLCANIC territory. This was of crucial importance the Conference of Henry Gaudru, European Volcanologica society, which dealt with the global mitigation approaches the VOLCANIC Islands at risk. In this regard, Gaudru said that systems of monitoring and early warning, we must add other actions of a more technical nature, in a clear reference to one of the premises designated by the United Nations Commission for disaster and IAVCEI (International Association of Volcanology and chemistry of the Interior of the Earth), and speaks of the need not only of monitoring VOLCANOESBUT FOR PREPARING HAZARD MAPS, INFORMING THE POPULATION AND MATERIALIZE AND TEST EMERGENCY PLANS THAT SHOULD BE KNOWN BY ALL. A reality marked by the expert is the dependence of the economies which have many volcanic islands in tourism, and that our territory is no exception. THE NATURE TOURISM MAKES THAT URBAN PLANNING SOMETIMES OBVIOUS SOME DETAILS THAT COULD LEAD TO PROBLEMS IN THE FUTURE, AND THAT COULD BE LOGICALLY LINKED TO THE VOLCANIC ACTIVITY IN ANY OF ITS FORMS. The development of specific management and emergency plans, including inter alia the identification of responsibilities and roles of local agencies, training and implementation in practice for possible vulnerabilities is essential, without prejudice to the implementation of a systematic program that considers the risk and effects of future volcanic activity in Islands inhabited as oursin which the demographic pressure we exert on the environment derive in a clear increase in the risk, because, we must remember, we are we who PROVOCAMOS the increased risk, and not the volcano, against what POPULARMENTE SE CREE. Make this type of details SEAN known by the population LOCAL are, among other factors, that driving the success of the VOLCANIC risk management, and, in that regard, the Canary Islands should not be be back when we compare it with other volcanic islands in our planet, such as Hawaii, the island of Reunion, or other nearby such as the Azores. (Humberto) ,,

www.facebook.com  AVCAN

jand

#3350
October 14, 2012, 07:09:18 AM
..The power curve seismic accumulated liberated of all earthquakes from 20/09/2012 remains the same, of 233 earthquakes in the same moment, stays at more or less the same rate, although today more quiet, and the last steps are the day 9 2.5 and 2.6 today can be seen perfectly.The fact that the curve becomes peaked with the best-trained steps indicates that the system is becoming more volcanic... and one of the possibilities is that we progress the start of a possible pressurization, now both earthquakes separated by some 65 hours in an area in the center of the island very concrete, if you follow this patternnext would be on the night of morning in the same area, we will see that it is... ..(Enrique)..

http://www.avcan.org/sismica/graficas/G1973.jpg?t=1350156368

jand

#3351
October 15, 2012, 18:06:54 PM

1170137  15/10/2012  00:00:48  27.7377  -18.0262  12 1.2 4 SW FRONTERA.IHI 
  • info

    1170138  15/10/2012  00:01:06  27.7185  -18.0300 10 0.9 4 SW FRONTERA.IHI 
  • info

    1170139  15/10/2012  00:01:38  27.7310  -18.0261 12 1.0 4 SW FRONTERA.IHI
  • info

    1170136  15/10/2012  00:01:56  27.7406 -18.0210  11  1.2  4  SW FRONTERA.IHI 
  • info

    1170140  15/10/2012  00:02:45  27.7355  -18.0293  11 1.2 4  SW FRONTERA.IHI
  • info

    1170141 15/10/2012  00:03:09  27.7232  -18.0252  12 0.6  4 SW FRONTERA.IHI 
  • info

    1170142  15/10/2012  00:03:47  27.7043  -18.0239 13 0.6  4  W EL PINAR.IHI 
  • info

    1170144  15/10/2012  00:10:00  27.7342  -18.0258  12 0.9 4 SW FRONTERA.IHI
  • info

    1170145  15/10/2012 00:10:56  27.7311 -18.0277 11 0.8 4 SW FRONTERA.IHI
  • info

    1170146 15/10/2012 00:12:43 27.7269 -18.0137 13 1.1 4  SW FRONTERA.IHI
  • info

    1170160  15/10/2012  05:52:57  27.7961 -18.1229  12  1.4 4  NW FRONTERA.IHI
  • info

    1170186  15/10/2012  09:46:19 27.7436  -18.0301 11  1.1 4 SW FRONTERA.IHI
  • info

jand

#3352
October 15, 2012, 20:45:14 PM
Ingrid Parparacen has just posted this on the Avcan Facebook page.



,,hola buenas noches,el olor en mi casa en este momento esta fuertesito ,tengo mucha indignacion y tristesa ya que me habian prometido que el dia de hoy hivan yo a venir a medir los gases ,nadie ni me llamo ni aparecio ,señores me parece que esto de los olores se debe de tomar en serio ,yo estoy preocupada por la salud de toda mi familia ,esto ya no es normal ,lo he reportado a ign ,a los cientificos via telefonica y autoridades del cabildo ,repito señores hasta cuando debo esperar para saber que es ese olor tan penetrante y fuerte gracias a todos por mas quesea leerme y permitirme que me desahogue en esta pagina

Translated.

Hello good night, smell in my house at the moment this fuertesito, have much indignation and sadness as I had promised that today anthropology to come to measure gases, no one or my name is not appeared, gentlemen I think this odors should be taken seriously, I am concerned about the health of my family This is not normal, so I reported to ign, via telephone and authorities of the cabildo scientists, I repeat Lords until when I expect to know it is that smell so pungent and strong thanks to all for you quesea read me and allow me to until I relieved in this page.

Some replies posted below:

,,
hable con el 112 me pasaron con un cordinador ,le explique por enesima vez lo que esta pasando ,me digeron que ellos hiban a informar y como tenian mi telefono me llamarian ,vamos a ver ,por que como les dige a ellos que es lo que estamos repirando en mi casa?

do talk with 112 I spent with a coordinator, you explain why nth time what is happening, me Athens they band to report and had my phone I llamarian, let's see, by that as them dige to them which is what we are repirando in my house?(Translated by Bing)

3 minutes ago · Like · 1..


Inma Guedes Según el protocolo de actuación deberían pasarlo a la policia local y otros efectivos, si no lo hicieran. Hay que seguir insistiendo.

According to the Protocol they should pass it to the local police and other personnel, if they did not. We must continue to insist

jand

#3353
October 16, 2012, 12:26:12 PM
Note 131 AVCAN - 15/10/2011 - 23: 15 h peninsular. -EVOLUTION AND TRACK ACTIVITY QUAKE-VOLCANIC ISLAND OF IRON.

http://www.avcan.org/mapas/AVCAN4797.jpg?d=1350335724

earthquake of 15/10/2012 - light blue (12) earthquakes from 14/10/2012 - orange (2) earthquakes from 01/10 to 13/10/2012 - yellow (114) updated map, follow the seismicity, and today has localized 12 earthquakes, 11 in a small enjambrito of midnight, with 10 + 1 earthquakes located in the central area of the island, in the area of the Gulf under the area of the revolts of the HI-1 road that climbs to the Summit at about 10-13.5km, being the more deep South and East... and one more than 1.4 later, now 11, to the NW of the zone of the swarm to 9 - 12 km from the Gulf to Sabinosa N and the 12 also in the area of the swarmthe more n. Today some vibrations in San Andrés, En Tigaday, Las Toscas Los Mocanes y Los Llanillos are reported. In terms of odors, have Ingrid reported us again in the previous post of this FB, odors in the area of the rough. As for the strange behaviour of animals have not reported. Remind everyone that it is very important if you feel something of all this, it is convenient to report it to the IGN have documented what was in addition to the importance that has in case of monitoring the possible opening of an eruptive mouth area... It is very important. (Henry)

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

jand

#3354
October 16, 2012, 12:28:35 PM Last Edit: October 16, 2012, 13:27:31 PM by jand
Follow earthquakes, some important in the area of Azores - Cape St. Vincent, says Antonio Manuel, is expected a rebound in activity in the iron in the coming days, I remember the strong June increase was preceded by activity in the zone 15 days before, but I can't find the exact data, speak memory, here I leave some of those registered today.


1170414 16/10/2012 07:36:11 37.2034 -12.6596 3.6 mb AZORES-CABO DE SAN VICENTE

  • 1170413 16/10/2012 07:23:01 37.1497 -12.6473 3.9 mb AZORES-CABO DE SAN VICENTE

  • 1170403 16/10/2012 06:04:24 37.1572 -12.7195 3.9 mb AZORES-CABO DE SAN VICENTE

  • 1170388 16/10/2012 05:28:40 37.2571 -12.7003 4.0 mb AZORES-CABO DE SAN VICENTE

  • 1170374 16/10/2012 05:16:55 37.1445 -13.0321 29 4.8 mb AZORES-CABO DE SAN VICENTE

    2012uint 16/10/2012 11:13:08 37.2400 -13.0600 10 5.2 3 AZORES-CABO DE SAN VICENTE
    y el servicio meteorologico portugues le da un 3.7..
    2012-10-16 11:13:11.0 37.22 N 12.82 W 1 ML 3.7 A AZORES-CAPE ST. VINCENT RIDGE


    www.facebook.com  AVCAN

jand

#3355
October 16, 2012, 18:10:28 PM
OT but still Volcano related:

Translated.

,,Magma hot air balloons creates training in the form of hat Charles q. Choi, collaborator of OurAmazingPlanet - October 11, 2012 02: 00 PM ET inShare ENVISAT satellite collected data from the point of lifting of magma in South America. CREDIT: Image created by Yuri Fialko, SIOUCSD, using images and illustrations of the ESA and NASA view full-size image a giant, rock hat-shaped formation grows in the Andes as magma Bob as a blob in a lava lamp, has found a new investigation. These findings, detailed in number 12 of October in the journal Science, may shed light on the birth of supervolcanos capable of larger eruptions than ever seen in history, said the scientists that they investigated the phenomenon. The team of researchers studied body active larger magma in the continental crust of land, an area of approximately 180 miles (300 kilometers) wide and 3,300 feet (1,000 meters) in width and a depth of about 11 miles (18 km) on the plateau of the Altiplano-Puna in the central region of the Andes. This area on the border of Argentina, Bolivia and Chile has experienced an intense volcanism for about 10 million years. The shape of a hat after analyzing 20 years of satellite and seismic data from the surface of the regions with models of computer, the researchers suggest magma is ballooning, forming a vast floating sphere in the middle of the crust, which is floating upwards. This blob is technically known as a diapir, and this research is the first to identify a diapir of active magma rising through it,,

jand

#3356
October 16, 2012, 18:13:27 PM

jand

#3357
October 16, 2012, 18:37:00 PM
Discover origin of the massive terrestrial volcanic eruptions in Tenerife
The Las Cañadas caldera has a history of eight mega eruptions in 700 thousand years, and in his remains, scientists discovered what happened immediately before these explosions

Scientists identified at least eight violent volcanic eruptions of a catastrophic nature to the Earth in the last 700 thousand years in the caldera La Cañada in Tenerife, Canary Islands, and discovered that the trigger for these explosions was when old and cold magma was mixed with fresh and hot magma.

Events generated were of such dimension eruptions were raised about 25 kilometers in height, with material pyroclastic which reached the 130 km of extension to your around, reported yesterday by the University of Southampton.

Doctor Rex Taylor and a University team studied nodules of igneous rocks formed by clusters of crystals of magma in the large volcanic eruptions of the past pyroclastic deposits.

Taylor stressed that these nodules of clusters of crystals are trapped in the magma chambers before solidify. Physical characteristics reveal the changes that occur in the magma until the volcano erupting.

These nodules resemble coarse wet sand balls, explain, and there is marked circles of crystals that are very different from if.

In this way scientists discovered in boiler La Cañada, circles of magma in the past are very different to those that existed immediately before the explosion.

Taylor posits that the agitation of the young and hot magma on the magma old and cold, seems to be the common element before each major eruption, said Dr. Tom Gernon, Professor of Oceanography and co-author of the study.

"Analysis of the volcano glass nodules documents end processes and immediately prior to the eruption changes that trigger catastrophic eruptions," says Gernon, according to a University report.

"The mere presence of white nodules in the piroplasticos deposits suggests that the magma chamber empties into the eruption, and the Chamber collapses on itself, forming the caldera", adds the scientist.

The team studies the La Canada de Tenerife volcano, is located close to populated areas, and has a history of large and catastrophic explosions.

They compared the lesser of these explosions was 25 times stronger than the eruption of the volcano Eyjafjallajökull in 2010 in Iceland, whose cloud spread to Europe and managed to block many international flights for days.

The boiler The Canada is located in the "ravines of el Teide", in Tenerife, in the Canary Islands, and is regarded as one of the larger boilers in the land.

About 170,000 years ago still existed a large volcano in the Centre of the island, where today lies the boiler, advises Geocaching. Recurrent eruptions of what was this enormous volcano emptied magma below.

On the north side of the caldera there are two active volcanoes, the "peak of el Teide" with 3,718 metres, who made rash in 1492 and the 'Pico Viejo' with 3,135 meters, which erupted in 1798.

According to Geocaching ' in the last five centuries, from 1492 always there was a volcanic eruption around the turn of the century not more than 10 years sooner or later ".

In 1492 was at Pico del Teide; In 1604, seven sources; In 1706 in Montana burned; 1798 in old peak and in 1909 the Chinyero.

http://www.lagranepoca.com/

jand

#3358
October 17, 2012, 18:49:31 PM Last Edit: October 17, 2012, 19:25:49 PM by jand

jand

#3359
October 17, 2012, 19:50:26 PM
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