El Hierro

[jand]

jonfr.com/volcano

M. Randolph Kruger says:

 November 18, 2011 at 05:11

I leave it in your hands Lurk. I dont have a clue how you do it but man thats goooood stuff.

It was your first 3-D that got me thinking about tubes and slowly but surely and running the daily maps for the quakes simulatneously with your stuff you get a picture of a basically a big wad of magma starting to move. I think its too deep for anyone to really measure it properly and certainly not with just the gear they have in the Canaries. This needs a full 4D mapping, with plots from GPS, sonobuoys, seismos in proliferation. I think they also are having to hand plot those quakes so the data may not get published very fast.

This also lends credence to two things I said. If it happens I dont think they will see it in time. I also think that they will not get everyone off that island in time if it does. Call it politics, money, economy or what...

Hell, just call it Herculaneum and Pompeii. They sat and watched and the damned thing killed them all. Wouldnt leave.... Why?

[jand]

http://www.ign.es/ign/layoutIn/volcaDetalleTerremotos.do?evid=1113221&zona=2

Another earthquake this morning in the middle of the ocean between the east coast of Tenerife and the west coast of Gran Canaria.

[jand]

jonfr.com/volcano

Alyson says:

 November 18, 2011 at 07:14

The Margalef mapping showed 2 newer vents – NW and NE of Frontera – out on the ridges where the northern promonteries extend, around the centre of the quakes in NW Frontera. I wonder if these vents are degassing more freely.

[jand]

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

Gas concentrations on El Hierro.

[SurfJames]

quote:Originally posted by Florence

quote:Originally posted by SurfJames

The harmonic tremors have stopped suddenly tonight and the vent has closed again.

Could lead to stronger earthquakes as pressure builds up.

Here is a simulation of what an eruption might look like:

http://www.youtube.com/watch?v=N86oJmQJsH8

Well, what ever it does - it will never be able to emit as much sh@t you can.  Of that we can be assured.

Possibly true Florence, but there's no harm in folk enjoying researching into volcanic activity.

I find it fascinating.  [][][][8D]

[SurfJames]

quote:Originally posted by jand

jonfr.com/volcano

Alyson says:

 November 18, 2011 at 07:14

The Margalef mapping showed 2 newer vents – NW and NE of Frontera – out on the ridges where the northern promonteries extend, around the centre of the quakes in NW Frontera. I wonder if these vents are degassing more freely.

That explains the sudden stopping of the harmonic tremors.

I assumed that the vent had sealed itself and the pressure would be increasing again.
Time will tell, because there will either be an increase in gases from the new vent or the land deformation will start again.

Gases suggest a new vent, deformatio a sealed vent.

[falkirkdan]

A large fast rib has just gone out to the area of usual action and returned even faster.    Appearded to be 2 person on board and Guarda truck on the harbour quay.   It has just gone out again with what appears to be more people on board.   It is headed west and gone out of the camera field.    There are 3 guarda type trucks on the quay.

[SurfJames]

That post from Kruger looks interesting and frightening.
He/she suggests that the authorities know more than they are letting on
and that they have planted siesmic readers in secret locations.
Also that the magma is melting rocks along ancient lava tube systems
and that it will errupt somewhere without warning. He feels that the authorities
are keeping people in the dark to avoid economic meltdown or re-housing costs.
But, he suggests that they won't be able to evacuate the island in time.

If authorities want to rule people in a paternal way, then they also need to
take the responsibility for peoples lives. They cannot have it both ways.
The alternative is that folk just ignore the authorites and respond in a manner they
feel is appropriate.

It's worth looking at Teide on Google Earth, as I previously suggested,
just to remind yourselves how massive these volcanos can be!

[SurfJames]

Falkirkdan - possibly looking for signs of a new vent?

I've been pressing return often in my replies, mate, and then it
 fits better on a smaller page. []

[fifi]

Strange that, mine is ok.

[fifi]

quote:Originally posted by falkirkdan

A large fast rib has just gone out to the area of usual action and returned even faster.    Appearded to be 2 person on board and Guarda truck on the harbour quay.   It has just gone out again with what appears to be more people on board.   It is headed west and gone out of the camera field.    There are 3 guarda type trucks on the quay.

One of the webcams is gone now. Hopefully they will install it wherever the new vent is.

[pennylane]

All the web cam when I'm looking ,
have gone Fi I've been watching them this morning..
the top one seemed to keep changin views and
I had sound with it !

ps Fi and Jand and Sufjames, & Dan x thanks for all your updates.

Glen

[pennylane]

youve probs got this already but heres another link for the web cam

http://www.canariesnews.com/el_hierro_live_webcam.html

[fifi]

Thanks Glen.[] I was just reading on Twitter that Movistar are installing two better quality webcams in the area.

Tweets from the Cabildo of El Hierro


 African countries such as Togo are also interested in  ElHierro.

Japan, Iceland, USA, Venezuela and Brazil are also interested in the eruptive phenomenon
Spain, Germany, France and Britain are countries with most users

The webcam of the Cabildo and Movistar have a daily average of 60,000 visitors from a hundred countries.

The webcam now has new content such as links to IGN, a Avcan and a counter.

The image quality of the  webcam will improve in the coming days with high definition cameras.


Visiting beaches still prohibited because of gasses.

Sailing is prohibited in the eruptive area. The marine research vessel Ramon Margalef are occasionally permitted.

Shipping restrictions within a  4 mile zone around La Restinga.


Roads continue with time restriction El Hierro (07:30 to 18:30).

November 18,  El Hierro recorded 14 earthquakes throughout the morning



Carmen Lopez (IGN) said the eruption process in the calm sea is "physically connected" to the north. # ElHierro

[pennylane]

on that link above there's some activity
but it keep cutting off...dont think they
want us watching !


Glen

[pennylane]

http://www.ustream.tv/channel/acn-media
this the ustream one with sound

glen

[fifi]

Thanks Glen.[]

[TripleH]

Nothing happened in the last 2 hours???

[pennylane]

I deleted the other link  ha ha it went to an Adult site.....
of course some of you may have prefered that so sorry to spoil your fun

Glen

[SurfJames]

Thanks Glen. (The real Volcanic heros are fifi and jand though[])

Here's the latest update:

As expected ... there we go again with the more powerful earthquakes.
At 15:32 UTC a 3.7 earthquake was listed by IGN and felt by the Herreños.
The  epicenter was close to the beach in the El Golfo bay. The hypocenter was a secure 23 km.
As long as the hypocenters are not reaching depths of less than 5 km earthquake-report.com
sees no real treat to the greater Frontera area. We are sure that Pevolca will act immediately
if multiple earthquakes less than 5 km would appear in the current El Golfo earthquake area.
The most probable scenario is that the La Restinga vent will open again when the magma pressure builds.
 Only a major magnitude +5.0 earthquake could break the current cycle.
 For people living at El Hierro, we do not expect earthquakes to create damage if the focal depth remains at the current 15 to 25 km and if the magnitude is less than 5.5. Landslides are a far bigger treat if earthquakes from +4.5 would become more common.

[SurfJames]

This picture gives some indication of the jacuzzi size:



it has been suggested that the jacuzzi is about 240m wide.
The explosion in surtsey, that ended up with the formation
 of a new island,  started with a jacuzzi that was about
 400m wide.

[woe10]

quote:Originally posted by Deso

Woe, could you please edit your picture posts as they are making the pages very wide and dragging all peoples posts way off the screen? []

Sorry about that Deso, somebody must have messed about with my Rhubarb. It was fine when I put it on. In fact I still have the picture on my desktop. Only 500 pixels wide.

[Deso]

Looks like the YouTube link for Fi is causing a problem as well. []

[jand]

jonfr.com/volcano

Claire says:

 November 18, 2011 at 11:24

My question is just from an ignoramus :

- How come the vents are closing up ?
 Is it a lack of pressure, and if so, what causes it ?

- If they collapse, how come magma wouldn't just blow it up ?

Also: Many thanks to Jon and you all, this blog is most interesting

Reply

KarenZ says:

 November 18, 2011 at 14:26

Not an expert myself. But magma rises becuase it is hotter and less dense than the surrounding rock. Pressure only builds up where there is more coming up from behind it than it can rise.

Vents close because:

1) the magma may cool so no longer rises;
 2) the magma supply may get cut off or run out;
 3) the magma may find an alternative route; or
 4) if the eruption is largely gas from de-gassing of the magma, the gas reservoir at the top of the magma reservoir may have emptied.

A new vent may open if magma finds an alternative route out.

[TripleH]

Originally posted by SurfJames

Thanks Glen. (The real Volcanic heros are fifi and jand though[])

OUCH!!!

[jand]

www.avcan.org

Choose "mapas en blanco"...once it opens choose bottom circle "canarias". Then, click on segun fecha. Desde is 17/11/2011, Hasta is 18/11/2011. Then, choose Energia Sismica and a color to represent what you want to look at. You will see...there is seismic energy points in the Canaries right now. Most of it is looking over Hierro BUT there is moderate seismic energy now located between Tenerife and Grand Canary as well!

Here's a screen shot of what should come up

 [link to www.flickr.com]

 Quoting: Idgits

IGT,
Just for fun I entered 01/07/2011 to 18/11/2011.
Worth taking a look, in my opinion.

I've looked at that. If you go back even further you'll see there has been lots of quakes all over the Canaries..and the seismic energy is vast and spread out.

[jand]

Avcan

Good afternoon, I now recommend to look in detail the "ladder of the devil" or evolution of the cumulative released seismic energy curve graph of energies and to see that you think, above all there is to look at the escaloncito there ahead of 4.4 and 4.6 (the last two steps fat, 4.6 on the right).

So well that escaloncito takes about 6 hours before the big quake, and it has been in almost all Windows, earthquakes in pairs separated by 6 h and this latest earthquake has formed the escaloncito and the serious time from 22: 00 h to 24: 00 h. We'll see what happens... nature has the last word...

Seeing the data, how it is behaving, can today be like the other day and we stay without earthquake, and that we go to the fifth window, 36-42 h then = > (after tomorrow from 8-10 in the morning) because the system needs more energy and so are the percentages that now handling (Henry).

-3% the first...
-5% the second...
-25% the third...
-30% the fourth...
-15% the fifth...
-5% the sixth...
-5% the seventh...
-2% mas alla of the seventh

I conclude with the recommendation of the reminder of the self-protection measures reading before seismic movements or volcanic eruptions:

http://www.avcan.org/sismica/graficas/G670.jpg?t=1321639573

[jand]

http://www.europapress.es/sociedad/ciencia/noticia-volcan-hierro-imagen-semana-espacio-20111118111814.html

MADRID, 18 Nov. (EUROPA PRESS)-

The submarine volcano is born near the South coast of the island of El Hierro, is depicted in this image of the European satellite Envisat. The volcanic cloud has faded the surrounding waters and turbid water has reached the coasts of the Canary Islands.

According to the space agency European, which has considered this decision 'Image of the week', the residents of the island are also felt frequent tremors - occurs several times a day - and they have seen dead fish floating in the water.

Residents have also described explosions on the high seas by launching material several metres above the sea level. The risk that the toxic gases emanating from a submarine volcano may represent for the population prompted authorities to close access to some areas.

ESA recalls the volcanic origin of the Canary Islands yq EU are recorded over a hotspot volcanic terms.

This image was acquired on November 9 by the spectrometer image of middle resolution aboard the Envisat satellite.

[jand]

Quote from spanish person on Avcan.

Translated.

The problem of the Spanish bodies (of all) is not made public their data.

That State (all) pay for some equipment, their energy, their bills, the salaries of the officials who work with them.. and not made public, if not remaining for 'exclusive' use of that access...It is outrageous.

With our money to State mapping... and that to get a decent picture, have to pay more than encargandola at a private satellite...

That there are 8 sismografos (I think that they were in the iron, but is unable to public 'because collapses them the server'...

I repeat, would understand that work with those data are paid access (I have to do this effort... of something all pagadopor has to pay for it) I do not understand is that devices public data are not public. (Translated by Bing)

[fifi]

Tweets.....

Canarian Volcanologist Carlos Carracedo said that their crisis management is an International laughing stock.

Avcan are predicting a large earthquake magnitude 5 within 22/24 hours.

The scanned images produced by the Ramon Margalef are not accurate because of the distance from the source.

La Palmas tremor is supposed to be man made http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EHIG_2011-11-18&ver=s&estacion=EHIG&Anio=2011&Mes=11&Dia=18&tipo=1