El Hierro

[jand]

Canarion says:

 January 19, 2012 at 22:35


When I look at these pictures comparing the new bathymetric data with the previous ones, something weird has happened. The big chunk of rock that broke from the wall of the canyon came back to occupy its old place in the wall of that canyon XD. Now my question are these fake old bathymetries? I know it sounds a bit extreme but here is a page from the university of Castilla la Mancha comparing the older and newer bathymetries and asing themselves the same question.

http://www.uclm.es/profesorado/egcardenas/bati.htm

[jand]

GeoLurking says:

 January 20, 2012 at 06:37

Well, theres more to "learn" that isn't that hard to understand.

Kiyoo Mogi is the Japanese seismologist who came up with the "Mogi Model." It's a really simplified mathematical thing that seems to be pretty good at estimating how much stuff is down there.

His model was derived by watching the change in the position of survey markers for a few well documented eruptions and doing a bit of correlation and modeling of the observed changes. For the ones he modeled, there was an inflation, and a deflation after the eruption.

I mention this because FRON has yet to head back to pre-eruption positions. This can mean one of two things.

1) The offset that FRON now shows is pretty close to what the new "normal" will be. This would be from whatever is down there cooling and becoming a plutonic emplacement.

2) The offset at FRON indicates that the "chamber" is still pressurized and is filling about as fast as it's venting.

Give the odd distortions that the different GPS stations have shown, (as much as 12 to 14 mm movement in a four day period... then back) and that Bob seems to be quite cheerful in spitting stuff out into the ocean... and the ever present tremor signal (that 0.59 Hz thing), item two seems to be the most applicable.

Now we get a bit... "out there." Bear with me.

Volcanic tremor.. specifically "harmonic tremor" has a few possible origins. It's been studied, analyzed spectrographed and pretty much everything but poking it with a stick.

No one is entirely certain what it's cause is. Not definitively.

If you turn on a faucet in your sink, you can hear the water running. Even from another room if it's quiet and the TV isn't blaring away. That is one manifestation that is similar to tremor. Fluid moving through a pipe.

Another thing that illustrates a possible source, is when there is air in the pipes. That makes a distinctive sound also... and logically, it fits what you would hear if there were roiling gas pockets in the magma.

A third everyday example of a possible source for tremor, is when you pop open a beer or soda. It looks pretty wierd in a bar, but hold the top of your freshly opened beer up to your ear... that fizz you hear is CO2 coming out of solution. Ramp that up to volcanic sizes and it become the other source.... SO2/CO2/H2O and other gases that are dissolved in magma coming out of solution. This is degassing.

From what I have read, magma tends to degass quite heavily at around 25 to 20 km if I remember correctly. (which is possible that I don't)

A pet theory, and one shared by a few other people here, is that the 0.59Hz signal is that degassing process happening down deep. That signal shows up on stations too far away to see Bobs fits, surges, exoplosions.

In other words, we are looking at different aspects of Volcanic tremor.

CHIE, EGOM, and EHIG have all seen Bob's little tremor transients. CFUE and EFAM don't show them. But CFUE and EFAM (mostly CFUE) do show that 0.59 Hz signal... and is seems to be temporally related to Bob's activity. In other words, it has some sort of time relationship.

My guess... and it is that, a guess, is that the signal shows us degassing at depth.... way down in that "chamber" area/region.

I have yet to find a clear artifact or signal change that I can directly link to something Bob does. But it was not there at the outset, and only showed up as Bob matured. On ocassion, it weakens at the outlying stations, then CHIE and Bob get active. Bob settles down, the signal starts to rise again.... at least it seems that way. Again, I have to definitive proof.

But it is fun to watch.

Feel free to ask about anything that doesn't make sense. If I can't answer it, I'm sure that some one can.

[jand]

Well... how about that.

Based on the Ramon Margalef and IEO volume estimate of 145 million m³ ejecta estimate, and incorporating that into my previous Mogi work,

The equivalent spherical chamber size (which we know is not spherical but that gets complicated fast) is 4.1 km from FRON, and 16.9 km deep. It is about 326 meters across.

This volume and depth would have produced a radial offset of 27.0 mm and fits the observed deformation at FRON at the time of eruption.

Assumption: That over all displacement of FRON has remained relatively constant since 10 Oct and that the "chamber" volume has not changed that much since the start of the Jacuzzi.

Known Error: The shape of the chamber is most likely cylindrical and along a general north – south trend.

Reply


GeoLurking says:

 January 20, 2012 at 01:52


Across should be -> radius..

Reply



GeoLurking says:

 January 20, 2012 at 01:53

If I am even halfway correct, this probably means that the stay time of newly arriving magma is not very long.

Reply

Bobbi says:

 January 20, 2012 at 02:07

What does "stay time" mean? The time between high and low HT? Or the stay time of the entire eruption process?

Reply

GeoLurking says:

 January 20, 2012 at 02:22

Stay time as in how long newly arriving magma (presumably from the mantle) is in the chamber before getting routed out through the pressure relief valve that we affectionately call "Bob."

The longer that magma has to sit around, the longer it has to crystallize and fraction into the different mineral types. That's a much longer process that you would see if the magma came in and sat in a "chamber" for a while and then erupted. That gives you the evolved magmas.

Since El Hierro did a couple of month run- up and pop, any wierdness in the stuff that comes out (restolingas) is either due to really fast fractionization, or the entrainment of previous material.

There was some argument among the experts about whether there were trachytic or rhyolitic material in the collected samples. Rhyolitic is the more silica rich version and takes longer to separate out to that level of concentration than trachytic material.

This leans in favor of my idea that a lot of the silica that is present is probably entrained from the Jurassic sediment layers.

Either way, to us is doesn't mean much, other than knowing a bit more about Bob's innards

[jand]

GeoLurking says:

 January 20, 2012 at 07:44

Okay... take this with a grain of salt... or better yet, the whole salt lick.

Via sensors that I do not have access to... only a description, there is potentially a thermal anomaly present south of Los Llanillos.

It's so small, that it could just be a noise artifact, but it has been present for a few "looks."

I quote MRK:

"Temps stand out better when its cold and its in the 50s and 40s at night right now. No roads, nothing that I have been able to get to stand out as being a source. Its there in the reverse spectrum on the 250 x 250 quadrangle and I would make it be maybe 25-100 feet wide. Fuzzy on the corners.

It also helped that it was misty last night as the dew fell which allowed me to get into bed by 0200. It makes warm stuff stick out when the outside air is cool. Clouds moving in today and tonight. You can see it on the cameras to sea.

Yep, a warm spot. Wouldnt call it a hot spot because this is done using the fire spectrum and its dicey if the temps are less than 150 degrees and this is barely bumping that. "

Working out the directions to the anomaly... it falls somewhere in this oval.

http://i44.tinypic.com/r8h1dt.png

Does anyone happen to know if there is a cave there? If so, has anybody taken any readings on it?

Just curious.

[jand]

GeoLurking says:

 January 20, 2012 at 08:00


Oh, by the way... For the government types of El Hierro.

I am pretty damn sure that you have access to ... um.. "National Assets" that can do a proper remote sensing look at this area.

I suggest that you do, and then all of you bump heads together and decide what it means.

The sensors off of this satellite are geared for searching for fires, not potentially volcanic thermal anomalies of the terrain

[jand]

Carlos says:

 January 20, 2012 at 12:56

IEO said in the 1st link...
 There are 2 emission zones...
 The main zone is the cone or the vent
 and there is a 2nd zone (how you can see with the plume of emissions of the profile I published above) this last zone of emissions is from the scarpe or slope of the canyon.

Reply

Carl le Strange says:

 January 20, 2012 at 13:04

I understand it to be on the La Restinga side of the vent, and that it is the smaller Jacuzzi that we see closer on the cam?
 But I might have lost something in translation.

Reply

Carlos says:

 January 20, 2012 at 13:09
-
 1)Around the volcanic cone
 2) on its top
 3) and the cliffs of the canyon, have
 found evidence of eruptive activity in the water column. These evidences are
 in all of the echo sounder echograms employed. With these data it was found that the
 major eruptive activity occurred at the top of the cone.

Reply

Carl le Strange says:

 January 20, 2012 at 13:19

Well, we wanted more information.
 Now we have quite a lot more information to ruminate upon.

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Sissel says:

 January 20, 2012 at 13:32

Stain as seen by Ustream at ca. 12:21 UTC today:

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Carl le Strange says:

 January 20, 2012 at 13:42


Uhm...
 Am I stupid here or is that a new gas vent right outside the western harbour breakwall???
 Seems to ba gas only, but a lot of it. I can though not see any sollid material in it. Judging from the colour at least on the cam.
 And the wind seems to have changed slightly.
 I hope they are on the ball checking gas emission in La Restinga.

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Michi says:

 January 20, 2012 at 14:10

Are you talking about the green-grey waters between the shore and the stain?
 Maybe the cone was high enough for a small landslide towards la Restinga, so it churned up ash, and other material between the harbour and the vent.
 Didnt really get which image you mean, but i am curios !

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schteve says:

 January 20, 2012 at 14:24

Hi All,
 Bottom Centre of screen in the zoomed out view? Looked like bubbling/small puffs of gas to me... but maybe an effect from the breakwater itself?

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Bobbi says:

 January 20, 2012 at 13:40


An ER reader is reporting seeing lava balloons further west and closer to shore.

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Carl le Strange says:

 January 20, 2012 at 13:45
That just can not be good.
 I am starting to wonder if the cone actually collapsed yesterday. Terminally collapsed in on itself. And then a large gas vent opened up at the forefront of the magma seeking a new way up.

If, and I say if, I am even close to being right after looking at that imagery, then they should remove the population from La Restinga.

Birgit says:

 January 20, 2012 at 14:07

I took a (very bad) screenshot of the floating thing which was not really tiny.
 http://www.flickr.com/photos/birgitha/6730750945/in/set-72157626644707610

[jand]

http://www.youtube.com/watch?feature=player_embedded&v=BKi6HeXjmHA

Video of the stain earlier this morning.

[jand]

Carl le Strange says:

 January 20, 2012 at 16:26


Okay, there is 3 active vents today.
 Bob, plus a gas vent half way directly towards La restinga (750m). And then there is an active gas vent 250m out from the harbour, it is seen on the Panorama cam to the left behind the western breakwater jetty.

Reply

[jand]

Update 20/01 – 16:09 UTC
 Just a trial we recorded a little earlier. We need the assistance of the Lava Balloon spotters to confirm that this would be the new location to look at.

http://www.youtube.com/watch?v=yMtu5CwupYM&feature=player_embedded#!

[jand]

http://www.youtube.com/watch?feature=player_embedded&v=vOOQRJCzK00

This video shows the seagulls nearer to the shore the comments on other sites relates to the new erruptions this morning and this may have caused many fish to die but they are pointing out how close to shore the erruption is moving.

[jand]

Avcan FB Copied and translated.

This wonderful bathymetric profile of the IEO volcano la Restinga in a manner much more apreiable and like this can be seen at the edge of the ravine, but there is something else... emission feathers... and is also of the cone, to the right of the cone it shows another feather of an emission, which may be the beginning of another mouth and starts dating volcanic material there to form another Cone, this win cone height more quickly to be flatter and have the current Cone in an area holding materials not outstanding rodarian down so easily. I conclude with something important, and is that more information be public but we come to see the reality of what is happening. (Henry
 http://www.canarias7.es/fotos/o/1201//246380-1g.jpg

[jand]

Gas levels for today.
http://www.gobiernodecanarias.org/cmayot/calidadaire/tiemporeal.jsp

[jand]

Avcan FB Copied and translated.

I have been able to get  it...
 Ram¨®n Margalef B/O ongoing since October of 2011 year a series of oceanographic called BIMBACHE1011 and aimed at the acquisition of data for scientific and technical advice from the Committee on civil security PEVOLCA. Part of the campaign BIMBACHE1011 7 legs, of which 4 have been dedicated to the acquisition of technical acoustic (Table1) data has been to date. This area has been a total of 27 (table2) day throughout of which have been able to obtain 9 bathymetric surveys in two main areas of work; the North in the Gulf area and the South in the Jul¨¢n area. This report refers to two recent surveys conducted in the area of la Restinga, extreme Jul¨¢n East. Only place in the prospectada area where underwater volcanic activity has been detected. These surveys were carried out on 10 and 11 December 2012 and the elevations MDE digital models presented correspond to the data obtained the first day.

(continued...)
 interesting facts: list of BATIMETRIAS that... few have seen?

DATE - name - LOC - hectares - MDE file ZEEE (IHM©IEO) IHM98 1998©2000 1st 23, 24, 25, 10, 2011 BIMBACHE1011©1 South 12816 S1025 25, 26, 10 27, 2011 North BIMBACHE1011©2 14104 N1027 2nd 27 10 28, 2011 BIMBACHE1011©2 this 4262 28 E1028, 10 29, 2011 BIMBACHE1011©2 South 2838 S1029 30, 31, 10, 2011 BIMBACHE1011©2 South 982 S1031 3rd 12/11/2011 BIMBACHE1011©4 North 10465 N1112 12, 13/11/2011 BIMBACHE1011©4 South 16547 S1113 4th 11 30, 2011; 1©2/12/2011 BIMBACHE1011©6 South 23169 S1202 5th and last 10/12/2012 South BIMBACHE1011©7 9117 S0110 11/12/2012 BIMBACHE1011©7 South 4023 S0111 now I would like that you comparaseis that this sentence of his "after a pre-procesado of data" press release, in order to facilitate as soon as possible relevant information to PEVOLCA, has mapped in detail the area of eruption in the South of La Restingafinding significant differences from the last survey made on 2 December.
 In the data obtained is has witnessed an increase in altitude of the Summit of the volcanic cone up to 130 metres in depth, 30 more since December. The diameter of the base is 800 meters and its height of 200.
 "The total volume of material issued since the start of the eruption, estimated by comparison with the 1998 bathymetry, is 145 million cubic metres, including cone eruptive and strained associated."

I repeat: last uprising of December 2, it now has 30 metres more... 130. That leaves us December 2 he had...160 m but who made the lifting of the December 2?
 Do refer to data of the 30th of November?

What about the uprising or the data of the Sarmiento de Gamboa?
 They appreciated the volcano to 175 m... on December 2 after dates...
 Do not be share data? (Translated by Bing

[jand]

http://212.170.244.196/

The sea has just started steaming again live now on the webcam.

[jand]

http://212.170.244.196/

Live on the webcam now are the smoking lava stones.

[jand]

Video on Youtube showing the ship on the stain and towards the end it shows a lava bomb coming up right in front of the bow and they backed off pretty quickly.

http://www.youtube.com/watch?feature=player_embedded&v=JGM6vuKlOWA

[jand]

volcano cafe copied.

Just been looking at the La Restinga village web cam and can see what seems to be large waves or steam above the cliffs(s) on the right of the picture to the right of the harbour. Suspect the latter as is it infrequent. Also a few smoking stones outside the harbour and a suggestion of a second vent between the main vent and the village,

Reply
KarenZ says:

 January 21, 2012 at 14:12

webcam angle moved so you can't check to wthether waves or not at the moment. And the resolution on the sea in the middle distance is not good.

Reply


Newby says:

 January 21, 2012 at 14:48

Karen, I find that really interesting about steam close to the cliffs. I was watching around about 13:30 to 2:00pm and saw the view was showing the cliffs when I opened the picture. I didn't see anything as I wasn't looking for anything but perhaps the cam operator had been told to look at that area? Very worrying if there is even a hint of activity there!

Reply

KarenZ says:

 January 21, 2012 at 15:01


Don't know for sure that it was steam but it was white, large and hung around for a while. Could have been spray from large waves, except for the length of time it hung around. Saw it couple of times before I posted at 13.01 and a couple of times afterwards. I have wondered since if Bob has been affecting the waves because there have been largish ones on the right of the screen, not seen on the left.

If you watch for long enough you can see large pyroclasts in the water between the vent and the harbour.

Reply

[jand]

This photo shows exactly how close the stain and erruptions of sls near the harbour wall.

earthquake-report.com
The Joke Volta picture from Earthquake report is rather worrying, too. I don't know, if the link will work, just trying.

https://picasaweb.google.com/110327184570944806725/ElHierroJanuary202012?authuser=0&feat=directlink#5699761960025537874

[jand]

KarenZ says:

 January 21, 2012 at 15:21


I wasn't sure about that one as it could just be variations in the light from sun / clouds. But in some of her shots it does seem that activity is closer to shore.

While this is a great photo, I did not like the fact that there are two areas of activity here:

https://picasaweb.google.com/110327184570944806725/ElHierroJanuary172012?authuser=0&feat=directlink#5698624983469730322

[jand]

KarenZ says:

 January 21, 2012 at 14:09


Chugging and / or degassing?

http://www.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2012-01-21_12-13&estacion=CHIE&Anio=2012&Mes=01&Dia=21&tipo=2&hora=12-13

http://www.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2012-01-21_13-14&estacion=CHIE&Anio=2012&Mes=01&Dia=21&tipo=2&hora=13-14

Reply

[jand]

https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B85hRyXM5rVOZjhmZTZhYjMtYTQ5Ni00ZDViLWIxZjktMzc5NWM0Mzg2ZmUw&hl=en_US&pli=1

IEO Full Report will need to be translated into English.

[jand]

Update 21/01 – 15:06 UTC
 - 2 new earthquakes occurred at 11:12 and 11:13 having a magnitude of 0.9 and 1.6 at a depth of resp. 13 km and 9 km. Epicenter earthquake 1 here and earthquake 2 here.

[jand]

Avcan FB Copied.

Note 425 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 21 January 2012-12: 00 pm peninsula - earthquake and volcanic activity continues moderate, with a bit of seismicity in the calm sea, in the area of summits at the height of the Tanganasoga and the mar de las Calmas and with some detected, but located not seismicity. Continues the signal of volcanic tremor in the eruptive zone of la Restinga, which is still very unstable, with strong explosions hidromagmaticas and numerous ups and downs, yesterday climbed, stop at 21: 55 stayed in minimum and then it has been rising, especially in the last few hours, making mince the ejected material. Magnitude between 1.4 and 1.1. New earthquakes 3. Ms 11 and 14.5km. 4. The day before yesterday. Yesterday (4). Today will be 1. In total van 12012 earthquakes located in El Hierro by IGN from 9: 00 pm of the day 19 July 2011 (Henry).

[jand]

EARTHQUAKES 21ST JAN. -Red (1)
EARTHQUAKES 20TH JAN. -Pink (4)
EARTHQUAKES ON 19TH JAN. -Green (4)
EARTHQUAKES 18TH JAN. -Blue Oscuro (1)
DAY 06 earthquakes on Jan 17. -Yellow (34)


Map of seismicity of the past two weeks you can see the zone of seismicity circulating the past days with the strongest in the perimeter zone earthquakes and as localized seismicity has been migrating to the South these past few days, 1.1 today (red) has been in the mar de las Calmas and the yesterday's (Pink) the last night of 1.4 has been in the area of summits at the height of the Tanganasoga (after this earthquake tremor unemployment) and those who had already to the South in the calm sea, one of them, that of 0.9, has been fair in the eruptive zone and has no depth and the other two to the NW. Antesdeayer (green) were more to the North in the area of Cala Pinar, another under the Tanganasoga and the calm sea.
2 days ago · Like · 8

[jand]

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


1122436 20/01/2012 10: 34: 45 27.6044 - 18.0228 0.4 mbLg SW EL PINAR.IHI 12010

1122515 20/01/2012 21: 55: 26 27.7125 - 18.0733 14.5 1.4 mbLg SW border.IHI
1122527 21/01/2012 00: 30: 28 27.6616 - 18.0487 11.2 1.1 mbLg SW EL PINAR.IHI
2 days ago · Like · 4

[jand]

En Fitur declaran que la isla tiene total garantía de seguridad, yo no digo que mientan pero, si tan seguros están de que TODA la isla es segura a que se debe que aun el Pevolca no haga públicos todos los datos que obtiene o bien por que estos últimos informes del IEO no son completos, por que no nos muestran la batimetria completa?

At Fitur declare that the island has total security guarantee, I'm not saying they lied, but if so sure they are that the entire island is safe is that even the Pevolca does not make public all the data it obtains or by these latest reports of the IEO are not complete, for do not show us the full batimetria? (Translated

[jand]

Digo yo que para tranquilizar al turismo, podrían empezar por mostrarnos todo el fondo marino entre el volcán y La Restinga, y no dejar el volcán en la esquinita superior derecha, que un poquito más y ni sale en la imagen.

I say that to reassure tourism, could begin by showing us all the seabed between the volcano and La Restinga, and not leave the volcano in the right upper corner, to a little more and neither appears in the image. (Translated by Bing)

[jand]

Buenos días, sobre todo a los Herreños.
 Parece que Sr. Volcán no quiere despedirse, de momento.
 En el IGN el último sismo de hoy a 9 Km de profundidad y de 1.9 cerquita del Tanganasoga, no me gusta nada.
 Que opinas AVCAM?


Good morning, especially to the Islanders.
 It seems that Mr. volcano does not want to say goodbye, for now.
 The IGN the last earthquake of 9 Km of depth and 1.9 near the Tanganasoga today, I don't like anything.
 Do you think AVCAM? (Translated by Bing)

[jand]

http://www.01.ign.es/ign/resources/volcanologia/CHIE/imagenes_sismica/HORA_SP/CHIE_2012-01-21_15-16_sp.jpg

Explosions are showing again on the IGN Graph,

[jand]

https://picasaweb.google.com/110327184570944806725/ElHierroJanuary212012?authuser=0&feat=directlink#

Photos from today.