El Hierro

[Magoo]

quote:Originally posted by fifi

If you look at the webcam now you can see the bubbles quite clearly.

My God Fifi, I think you are correct!

[fifi]

[][][]

[SurfJames]

Just come in from doing a sound check at a local venue, and the screens completely black!! Has the camera been destroyed by some massive eruprion and I missed it?

(Ps Doing a gig tonight and I'm as nervous as hell.....always get stage fright, but they always go ok, but stage fright is a funny thing. It disappears the moment you walk on stage!!)

[fifi]

Hope the gig goes well Surfjames.[8D]

Tweets from Raymond Matabosch who has followed volcanoes all over the world for over 40 years and who is camped out in El Hierro at the moment.



The submarine volcano will have an aerial eruption during the night of November 12 to 13? (His prediction)
12 seconds ago Favorite Retweet Reply

The underwater explosions, from 18 h 00, resume off La Restinga.
38 seconds ago

Different translation....
Underwater explosions, since 18: 00, take off the coast of La Restinga.
38 seconds ago


French.... Les explosions sous-marines, depuis 18 h 00, reprennent au large de La Restinga.

[jand]

Fifi I actually saw the whirlpool forming it was when there was a lot of bubbles and activity in the ocean then the ocean started moving and coming back on itself.

I have been reading on the internet how earthquakes can cause whirlpools do you remember the one that happened when the Japanese earthquake errupted and we saw the little fishing boat on TV caught up in it.

[jand]

The Director of the Observatory Geophysicist of the Institute geological survey national (IGN) Carmen Lopez, requests the herreña population "which rely on labour científco" developed by experts who are following the evolution of the eruptive phenomenon, as well as the messages that is giving the address of the Emergency Plan de Canarias (Pevolca).

In this way responded López to be asked about the feeling that they have some citizens on the island that is not providing all the relevant information to the citizens or are altered the actual data to not generate alarm.

In this sense, he denied that IGN has detected a second signal of tremor indicating a submarine eruption ye underway in the Gulf, contrary to what is becoming more widespread in some Internet forums. "With current data from the monitoring network there no evidence that there is another sign of tremor", says the news sheet. What has it done the IGN is to install equipment to distinguish different simultaneous sources of tremor, so it made it clear that "in case a second source, have ability to be able to distinguish which is linked to La Restinga".

At the headquarters of IGN in La Restinga campaign far moved in the morning of Saturday Journal of notices, López insisted his request citizens so that they rely on the Pevolca. "The management of the plan is being good, and there is complete coordination with scientific groups, enabling measures sensible and well implemented."

The currently responsible for the scientific equipment deployed by IGN in El Hierro, because yesterday succeeded in La Restinga María José Blanca – Director general of the Agency in the Canary Islands-emphasizes that "the volcanology requires monitoring and can be forecast with space of a few hours or days, as nature shows signs that allow to know in advance what can happen", so activate the appropriate civil protection measures.

http://www.diariodeavisos.com/2011/11/12/actualidad/pedimos-a-la-gente-que-confie-en-los-cientificos-y-en-el-pevolca

Reply

[jand]

One persons opinion on the above post.

wwww.jonfr.com/volcano


And since I trust Lurkings way of deciding more than Pevolca, I would say that this is utter balloney. Horking Holistic Hogwash from Perez as usuall.
 There is good evidence of a second harmonic tremor, so this time I am calling his lies. He needs to put out evidence for what he is saying since all public data shows contradictory data to his statements (as usual).
 Senor Perez, you lie.

Reply

[Paddster]

[jand]

Ign graphs have not been updated since approx 1430.

[jand]

Paddster an easy solution

IF THIS BORES YOU STOP READING IT !!!!!

[jand]

http://www.wired.com/wiredscience/2011/11/hydrovolcanism-when-magma-and-water-mix/

The activity at El Hierro has brought up a lot of questions about just exactly what happens when a volcanic eruption occurs underwater — and specifically, what happens if that eruption begins to occur in shallower water. This is the realm of "hydrovolcanism" or "phreatovolcanism" — when water and magma interact, either directly or indirectly, to produce volcanic activity.


A phreatic explosion on April 12, 1980 at Mount St. Helens. Image from the USGS.

In general, magma's interaction with water comes in two flavors — phreatic, where the eruption is steam-driven, but no magma is directly involved, just heat, and phreatomagmatic, where magma is involved directly in the eruption. Phreatic eruptions don't require a lot of water — if groundwater or snow/ice melt seeps into a volcanic edifice and heats up (typically due to a new intrusion of magma coming into the upper part of the volcano), that water can flash to steam causing an explosion (see above). Many times, these phreatic explosions are precursors to renewed activity at a volcano.


Phreatomagmatic eruptions require more water than phreatic. What happens in a phreatomagmatic eruption is usually the erupting magma is directly introduced into a body of water — possibly a crater lake, meltwiter from snow or ice, seawater — and the very large contrast in heat (sometimes upwards of 1100°C between water and basalt) causes an explosion of both the water and magma. This is called fragmentation, and ash can be produced during these explosions, meaning what could have been a lava flow becomes an explosive eruption. The 2010 eruption at Eyjafjallajökull in Iceland was initially a phreatomagmatic eruption when the explosive phase started — the erupting magma came into contact with the melting icecap on the volcano and gave it extra explosive oomph — and helping Eyjafjallajökull go from being an eruption that only Icelanders and enthusiasts would note to one that brought Europe to a halt (we might term this a phreatoplinian eruption, capturing both water's role and the height of the plume). We also saw this explosive interaction of water and magma at the 2009 eruption of Hunga Tonga-Hunga Ha`apai. However, the eruption that gave its name to these events — the Surtseyan style of eruption* — was the 1963 eruption of Surtsey off Iceland. In that eruption, much like at El Hierro, the events began as a submarine eruption that eventually reached the surface. The most characteristic aspect of these phreatomagmatic and phreatoplinian eruptions is that the ash produced tends to be much finer in size than normal explosive eruptions that are not driven by water. In the rock record, peperites are likely the result of phreatic/phreatomagmatic eruptions as well.


An aerial image of the 1963 Surtsey eruption off of Iceland. Note how the vent in the middle of the tephra cone looks very similar to the current El Hierro activity -- a zone of steam and bubbling, albeit more vigorous. Image from OSU slide collection.

Now, why did the eruption at Surtsey (and El Hierro) need to get closer to the surface to produce an explosive eruption? That just comes down to pressure. The higher the atmospheric (or hydrologic) pressure, the harder it is for magma to fragment and cause an explosive. At surface pressures (~1000 mb or 1 ATM), the lower limit for dissolved gases needed to create an explosive eruption is 0.07 weight %. However, at 100 meters depth in the ocean (~10,000 mb or 10 ATM), that value is closer to 3 weight % dissolved gases, so it takes a lot more dissolved gases in a magma to cause fragmentation when there is increased pressure**. So, until the eruption is close enough to the surface to allow for fragmentation to occur, the eruption won't manifest itself as anything more than stains, bubbling and debris. Once it gets close enough to the surface or dissolved gases increase, then we can start getting explosions to occur — the famous "Rooster Tails" or "Cypressoid plumes" of Surtseyan activity. However, there is some suggestion that large explosive eruptions can happen in the submarine setting — the so-called "Neptunian" eruptions — but they are not well understood. Once an island is established (and these can be quite ephemeral as they are mostly made of loose volcanic debris), then the activity might become much less explosive. At Surtsey, impressive lava flows (see below) were issued from the vent once it was closed off from intrusion by seawater.


Effusive lava from erupted from Surtsey in 1963 after the vent became subaereal. Compare with the image above. Note the large steam plume on the far right where the lava meets the ocean -- another example of water-magma interaction. Image from OSU slide collection.

This is, by no means, all the ways water and magma can interact, but you can at least get an idea of what we might expect from El Hierro if the eruption continues – so be sure to keep an eye on the webcams being set up at the island.

* If the interaction is with groundwater, some people call these Taalian eruptions, after Taal in the Philippines.

** This is why on a moon like Io you can generate volcanic plumes that are 100s of km tall — with some help from high eruptive rates and lower gravity.


Erik Klemetti is an assistant professor of Geosciences at Denison University. His passion in geology is volcanoes, and he has studied them all over the world. You can follow Erik on Twitter, where you'll get volcano news and the occasional baseball comment.

[Paddster]

[jand]

http://www.facebook.com/l.php?u=http%3A%2F%2Fimg90.imageshack.us%2Fimg90%2F337%2Fp13gb.jpg&h=IAQELcJilAQF_PXHCMeYB1FqSApLMcqNPUHLcJ5uBcmemDw

Recordando lo que se indico al incio de la erupción submarina en La Restinga volvemos a poner el esquema que puso de ejemplo en su dia Ramón Ortiz. Según esto la erupción de La Restinga seguiría a unos 200 m de profundidad más o menos (Félix)
Translated
Recalling that be indicated at the beginning of the underwater eruption at La Restinga again put the scheme that put for example in his day Ramon Ortiz. According to this eruption of La Restinga would continue for about 200 m of depth more or less (Felix

[jand]

Durante el vuelo del día de hoy, los miembros de INVOLCAN así como los de la unidad de helicópteros de la Guardia Civil de la zona de Canarias, fueron soprendidos por una deslizamiento de tierras y rocas en la zona norte de la isla. Afortunadamente sucedió en una zona despoblada y la instantánea pudo ser capturada, aquí os la mostramos

Translated
During the flight of the day of today, the members of INVOLCAN as well as those of the Civil Guard in the area of the Canary Islands helicopter unit, they were surprised by a slip of land and rocks in the northern part of the island. Fortunately it happened in a depopulated area and the snapshot could be captured, here we her we show

https://www.facebook.com/pages/INSTITUTO-VOLCANOL%C3%93GICO-DE-CANARIAS/134042953295772#!/media/set/?set=a.174701045896629.39574.134042953295772&type=1

[fifi]

You can see the two views simultaneously on this one.... http://earthquake-report.com/2011/11/12/32535/

I dont remember the fishing boat jand. I love volcanos but this is the first one I have followed in any detail.

[little legs]

ive been keeping an eye on this thread for ages now but not to sure 100% but i think you jand will get off on this if it does kick off in a big way

[jand]

http://www.dailymail.co.uk/sciencetech/article-1365414/Japan-earthquake-tsunami-disrupts-currents-Huge-whirlpools-form-coast.html

[jand]

Comments on the photo of the north side of the island showing rockfalls.

https://www.facebook.com/pages/INSTITUTO-VOLCANOL%C3%93GICO-DE-CANARIAS/134042953295772#!/media/set/?set=a.174701045896629.39574.134042953295772&type=1

It has been confirmed from the pilot on the helicopter that it is dust that is showing not steam or gasses.

[Paddster]

[Paddster]

[fifi]

quote:Originally posted by little legs

ive been keeping an eye on this thread for ages now but not to sure 100% but i think you jand will get off on this if it does kick off in a big way

Absoloutely. I cant wait for a huge eruption and the birth of a new Island hopefully. History in the making.[]

[kevin2003]

quote:Originally posted by Paddster

If you're bored Paddster,why bother reading?

[jand]

The comments below are from a very level headed person who has been  writing on jonfr.com/volcano and producing graphs from the information of ign.

Other people on the internet have commented that he is talking about the filling in of seismicity on higher frequencies seen throughout the canary chain on IGN.


http://www.01.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2011-11-13_02-03&estacion=CHIE&Anio=2011&Mes=11&Dia=13&tipo=2&hora=02-03

Quote.

That is larger and larger amounts of magma going up, with the Buddha (harmonic tremor spike) running in red up to ten and yellow up through the roof, being rapid infusion of magma into a fissure. Problem is that we do not have a clue where it is running.
 And let me go on record saying that I never anticipated that the magmatic flow would increase this much. Whatever it is that is running down there is of the size of tens of Bobs.
 I think this is El Golfo volcano awakening again. And that would be the end of the island if an eruption there lasted for some time. There is no way to keap the population there as a large central volcano erupts. And judging from the volume of sub-crustal magma this is going to be going for years.
 Only two questions that are left really is if Bob will have time to go above the surface before El Golfo erupts, and where in El Golfo the eruption will happen. It could be very far out, and that would save the Island, or it could be on the beach, and that would be good night.
 Sorry Armas, but this is not good for your Island.

[jand]

www.jonfr.com/volcano

The Grand Tour of Physics!
 Just found this through AVCAN:
 http://www.elmundo.es/especiales/2008/05/ciencia/sonido_naturaleza/sonidos_11_11_2011.html

Translated

UNDER THE VOLCANO

Carlos de Hita

Seems that somewhere is writing that entire generation process begins with a huge noise, a big bang. On Earth, the largest registered ROAR since there are human ears to listen to what occurred in August, 1883, when the volcano Krakatoa, East Java, disintegrated in a cataclysmic explosion that smashed an island, her projected in the form of ash into the stratosphere and caused the most formidable ever ROAR. The size was such that could be heard over 5,000 kilometers, as far as the heart of Australia or Mauritius, between four and five hours later that occur. It has been calculated that, at 40 kilometers from the ROAR, the noise level was 180 decibels, hundreds of times more powerful than the largest known noise; a scale of sondo so incomprehensible to us as huge distances.

Explosions and the ROAR heard on this recording are, nor much less, so powerful. They belong to the volcano Kilauea in Hawaii. The dull, deep sound emerges, literally, from the bowels of the Earth. A sound impossible to confine to its greatness in the narrow limits of the speakers of a computer.

Closer, the voices of the volcano are others. The lava flows with a mixture of conflicting sounds, a fusion between the liquid and the stone. In a pool of molten rock, a boiler red hot boiling lava borbotea with big bubbles, is released on suppliers of stone where the projected fluid is the same stone.

Supplier type pahoehoe lava. | Jim D. Griggs.

Out of the boiler, the main types of lava are two pahoehoe and A´a, Hawaiian terms meaning "soft" and "stony", respectively. The pahoehoe is the most liquid lava, a casting that flows with a sticky sound. Lava in type A´a is less viscose and drag semisolidificados blocks of rock; the surface is more irregular, the rocks of the front advance by the thrust of the hotter magma that comes from behind, and sound reminiscent of a carbonera. This lava A´a is the cause of the malpaíses of the Canary Islands, the chaotic Plains of renegridas rocks, sharp edges.

I say, we hear is not the submarine volcano of El Hierro. Not yet.

[jand]

El Hierro is being covered on American TV

http://www.youtube.com/watch?v=9x0kA0TChMA

[jand]

www.earthquake-report.com

Update 12/11 – 23:25 UTC
 - The political parties at El Hierro have decided NOT to campaign for the elections to be held next week. Their decision has been taken to avoid controversy.
 - Some people are feeling very bad because they have to ask for food at the authorities. A lot of families are really in bad shape at the island and have nothing left.
 - A steel fence has been installed at the end of the Los Roquillos tunnel to catch rocks and stones in cases of landslides and rockfall.
 - Although there was NO jacuzzi yesterday, new fine eruptive material has been reported in the Las Calmas sea by the Guardia Civil and Involcan
 - Volcanologists are still convinced that an eruptive vent may appear in the El Golfo area. They are monitoring the seismographs constantly to detect eventual shallow earthquakes.
 - Only one earthquake occurred from 15:59 UTC until 21:29 UTC. It measured 2.3.
 - Magma is very active below the island. Harmonic tremor is still very strong with irregular bursts

[TripleH]

quote:Originally posted by Paddster

This is a bit harsh Paddster! jand hasnt slept for 4 weeks or so just to bring us this information!!

[SurfJames]

'Hope the gig goes well Surfjames.'

Thanks fifi.....it went really well and sold out! The audience really enjoyed themselves.

Got two more coming up before xmas...so getting nervous about those now!!!

[SurfJames]

I can't get comnnected to the webcams this morning....is anyone else having difficulty.

I cannot believe how the local authorities and scientific community are falling out so much. This is the problem with paternal politics...when you get a crisis, the locals are kept in the dark about events by politicians, because the authorities project the image that they know best and are in control. A stranglehold! The scientists are sayimg 'Hold on a minute this more serious than you're telling us..so they get censored'! Preventing free speech is outrageous imho.

 Imagine you've had to leave your home in Restinga....it might be a year or more before you're allowed home. What do you do in the meantime? Where do you live, how do you eat? I suspect that the locals are being treated poorly at the moment. Imagine if the island has to be evacuated..those poor folk will lose everything.

[fifi]

Earthquake report are suggesting that it is overloaded. I will have a look on the net for some more information in a minute.

Raymond Matabosch tweets


Scientists believe that underwater explosions have occurred off the coast of La Restinga on November 12
2 hours ago


The "surge" of materials has intensified on November 12, with ash expulsions

.................

S02 levels have decreased http://www.europapress.es/sociedad/noticia-desciende-emision-dioxido-azufre-hierro-20111113104522.html

CO2 levels increasing http://www.canarias7.es/articulo.cfm?id=237985

One of the reasons that these studies are carried out is because carbon dioxide is one of the driving forces behind a volcanic eruption. It is the second major component of volcanic gasses after water vapour. Its low solubility in molten magma causes the  carbon dioxide to escape the volcanic system in depth.

 ..........................

New stain in the water in the location of one of the previous jacuzzis and residents complaining of a strong smell of gas

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           ....................
Tweet....

PrensaElHierro Cabildo de El Hierro

Good Sunday. From 23:00 hours there have been 10 earthquakes in  ElHierro, none felt by the population.
10 minutes ago

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The village of La Restinga has become a ghost town. Before the eruption it was full of Tourists and foreigners, now just neighbours.
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