El Hierro

[isleswing]

It's not more sleep j an d need, just get out more!

[jand]

Islewings I will let you into a secret just as Santa has his little helpers at Xmas I have my little helpers posting some of the updates!!!!

[isleswing]

Perhaps one of your little helpers could learn to translate your copies into intelligible English before posting? They're not doing vey well at the moment.

[jand]

Note 417 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 13 January 2012-11: 00 pm peninsula - earthquake and volcanic activity continues moderate, with some seismicity located yesterday in the interior of the island, and today some 25 km to the North of the island of el Hierro in direction to the island of la Palma. Continues the signal of volcanic tremor in the eruptive zone of la Restinga, stays more or less with an amplitude which in general terms this fall and is more unstable and some explosions. The magnitude between 1.6 and 1.5. New earthquakes 2. Depth 15 km. yesterday 7. Yesterday 2. Today will be 1. In total van 11994 earthquakes located in El Hierro by IGN from 9: 00 pm of the day 19 July 2011

[jand]

Heather B says:

 January 13, 2012 at 20:11

An Earthquake between Tenerife and Gran Canaria
 13/01/2012 19:23:39 28.1481 -16.2133 17.7 1.3 mbLg ATLÁNTICO-CANARI
 http://www.avcan.org/index.php?m=Catalogo&a=catMedida&f1=13/01/2012&f2=13/01/2012&m1=0&m2=9&p1=0&p2=9999&s=2&z=0&zi=0

Reply

KarenZ says:

 January 13, 2012 at 20:20

Well that has just wrecked the comment I was going to make that the 3 quakes today were in a straight line from El Pinar to WNW Sabinosa,

http://www.avcan.org/?m=Animacion

Don't forget to select today as 13/01/2012 otherwise it could be a long night. But may be good for insomnia.

Reply

 January 13, 2012 at 20:24

Avcan FB

nights, today the seismicity is aligned along an axis WNW – that, at least three earthquakes today and also map this seismicity of the last week continue with what we mentioned yesterday, that earthquakes are grouped in a circle and the more strong in the outer zone of the circle. (Henry)

EARTHQUAKES 13TH JAN. -Pink (3)
 EARTHQUAKES 12TH JAN. -Blue clear (1)
 DAY 06 earthquakes on Jan 11. -Yellow (24)

The two new earthquakes are:
 1121497 13/01/2012 15: 39: 18 27.7089 – 18.0144 10 2.5 4 W EL PINAR.IHI
 1121505 13/01/2012 18: 48: 05 27.7203 – 18.0542 12 1.2 4 SW BORDER.IHI

By the way that the 2.5 has been able to be felt by its shallow waters and its intensity.

Reply

[jand]

Avcan FB Copied and Translated.

Note 418 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 14 January 2012-11: 00 pm peninsula - earthquake and volcanic activity continues moderada-alta, with a bit of seismicity in the interior of the island. Signal of volcanic tremor continues in the eruptive zone of la Restinga, stays more or less with an amplitude which in general terms this up a little bit, especially the last few hours. Magnitude between 2.5 and 1.3. New earthquakes 4. Depth to 10, 12, 16 and 16 km. yesterday 2. Yesterday (4). Today will be 1. In total van 11998 earthquakes located in El Hierro by IGN from 9: 00 pm of the day 19 July 2011 (Henry).

A curious fact AVCAN Facebook has also 11998 people that I like... thanks to all those who have done so possible... ^ _ -

[jand]

Avcan FB Copied and Translated.

Volcanic news of Canarias (AVCAN).
EARTHQUAKES 14TH JAN. -Green course (1)
EARTHQUAKES 13TH JAN. -Pink (4)
EARTHQUAKES 12TH JAN. -Blue clear (1)
DAY 06 earthquakes on Jan 11. -Yellow (24)

In the map of sismcidad of the last day, yesterday seismicity (earthquakes 4), is aligned along an axis WNW - that, stressing that 2.5 yesterday 10 km. Today, the only earthquake located so far, continued in the same area but a little more to the South, emphasizing that 2.5 yesterday 10 km. The previous activity in the last week are still what we mentioned yesterday and antesdeayer, earthquakes are grouped in a circle and the more strong in the outer zone of the circle.
2 hours ago · Like · 4

[jand]

Update 14/01 – 17:16 UTC
 - Based on the current and past position of the Ramon Margalef  (gradually and slowly getting closer to the jacuzzi) we suppose that the Oceanographip ship is using one of his ROV's to have a close look to what is happening beneath the surface. The ROV's are able to navigate to deep depths and are manipulated out of a control room on board of the ship. Depending on the visibility, which may be good out of the current, we might be able to look at great video one of the coming days. If the ship isn't using his rov's ha may be taking samples of the different waters newt to the vent. Both possibilities are realistic.

[TripleH]

jand I am thinking of booking for March, seriously do you think it is safe?

[Paddster]

LMFAO...............

[jand]

TripleH

Whatever reply I give will be slated and I will receive personal attacks  by certain members of the forum so sorry I am refraining from answering.

[jand]

Published 10 minutes ago in the FB of the spanish oceanic institute (IEO), owner of ths ship Ramón Margalef:
 "Right now we are living a clear example of the lack of sensitivity and scientific management to the village of El Hierro and all the people in general who are interested in this phenomenon. Since many hours ago you know how far away the focus from the surface. I do not know if this lack of sensitivity due by how you know the actual fact we all know it or what to ... Of course you must decide what is the cone and what is interference... But I do not think that it takes some time when in this case is not clear a possible complete bathymetric artifacts and interference. That simple fact that there is not a quick and good communication, makes a good summary of what the current political situation, administrative, scientific, in the events of El Hierro. That after the political and scientific management can complain and accuse somebody of speculation, rumor, when you are the main guilties by your lack of transparency and communicative dynamics more typical of the times of the pony express to the communication age . If what is intended by this policy is to hide the volcano under the blanket of the invisibility of the Rings Lord of Rings, then yes, you are doing very well. But in any case that would be a political issue and political issues are for politicians ... And to my knowledge you. are scientists."

Well... Our assault to open the gate towards the bathymetrys goes on.

[jand]

Note 419 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 15 January 2012-11: 30 pm peninsula - earthquake and volcanic activity continues pluviometry, and some more detected event. Continues the signal of volcanic tremor in the eruptive zone of la Restinga, stays more or less with an amplitude which in general terms this up and it is more unstable with gaps explosions. There is no new earthquakes. 4. The day before yesterday. Yesterday 1. Today will be 0. In total van 11998 earthquakes located in El Hierro by IGN from 9: 00 pm of the day 19 July 2011 (Henry).


http://www.ign.es/ign/resources/volcanologia/CHIE/imagenes_sismica/DIA_SP/CHIE_2012-01-15_sp.jpg

[jand]

volcano cafe copied.

Betty says:

 January 16, 2012 at 10:40

I disagree. We really do not know the structure of the plumbing system under Bob, except that Lurking and Karen have done some outstanding work attempting to unravel the mystery. The experts themselves do not know for sure, there being discussion between a single magma chamber, two magma chambers, or a series of many pockets. Yes, Bob is erupting. Yes, the path of least resistance will be taken. Not sure what you mean by "it being very hard for magma to move much in the first case (the largest majority of it getting stuck)." Do you mean, that once it has erupted, it cannot move much? In that case, I'll agree, because Bob is working hard at building a wider base and reaching the surface. The danger will be what Bob does when he finally comes up. I am not sure how many vents the top of Bob has, because those that know are not sharing their data. We have EQs in areas away from Bob, possible fumes away from Bob, and continuing harmonic tremor which has not stopped ever and now increases. Although everyone hopes for the best, to say that we know that nothing else is going on is just not possible at this point.

I am not an alarmist by nature, but I am vigilant when I need to be. I am extremely curious to know why bathymetry charting is not being shown. This volcano is 1.8km to 2.0km offshore, depending on where you are standing. That is very close. This thing is dangerous. How close is it to the surface? The entire island wants to know. You say the lava is not traveling very far? Then it's building up a cone. HOW CLOSE IS IT TO THE SURFACE? Or, is there a second vent in El Golfo? Or off Roque Salmor?

This is a complex eruption for the following reasons: EQs started on one side of the island root, then moved to the other side; it started with shallower quakes, then moved down, then moved up; whenever Bob slows down, EQs start up again, with or without chugging, which is probably not related to this peculiarity at all, anyway; the probability of ring fractures exists; the composition of the magma is disputed; there is the history of two, possibly three, other much, much larger volcanoes in the vicinity; and there is a huge fault, although dead, which is long enough to be a factor in analysis.

This volcano was most likely going to have a limited supply of magma. But, it has already gone on for a long time. Where is the magma storage occuring? This Bob is turning out to be a very large fellow. He could quit in a heartbeat, but he's just not. And if we start having really deep quakes again, it could be a second cycle of magma mixing and rising.

How tall is Bob? This would be helpful to know. I might bite if I were shown the progress Bob has made. But, I am starting to suspect a humongous volcano is coming up. (Blog standing caveat: I am not an expert.)

[jand]

Carlos says:

 January 16, 2012 at 09:32


The battle for obtaining the bathymetry go on...

Published in the FB of the Spanish Oceanic Institute, owner of the ship Margalef, 15 minutes ago:

"IEO Sirs: Excuseme for the insistence that we have curious minds and I'm also sure that you understand us because the curiousity is the mother of science. I intend to be educated, not politically correct. Without going into the reason has changed its publication policy Bimbache operation, but without being as politically correct answers that are being cleaned bathymetry of interference from the fall of last year. I'm sure you understand our curiosity not only to know the height of the volcano, but also to see a plan elevation, bathymetry. Especially after seeing how the bathymetry of November 13 was observed as a zone volatilized 1 km long by 200 meters wide for the northern slope of canyon. We request for publication of the bathymetry as soon as possible. All people who are interested in this phenomenon and all the people who love the Cienica dissemination, we thank infinitely."

http://www.youtube.com/watch?v=0zE9H9m5QJM

[jand]

Carl le Strange says:

 January 16, 2012 at 14:43


First we would like to apologize for the lack of information in recent weeks. We hope to publish a new report in the coming days.

We also wanted to explain that the presence of the IEO in El Hierro not to respond to any research projec,t but it is a mission to create an emergency plan for the volcanic crisis. Thus the primary objective is not to investigate, but to provide information to help maintain the security of the population. This implies, among other things, that the priorities of research not only for the IEO PEVOLCA scientific committee. Therefore, the results are sent first to the committee and then, if deemed useful, to the scientist responsible for study through a public report.

As for the latest bathymetry, first it could not be completed by the already mentioned interference. When we proceeded to sweep the problem area again the ship had a small fault that forced her to return to port. After repair, the intention was to return to the area to complete the work but the PEVOLCA requested that the vessel wa sent to the north to do hydrography and check whether or not a vent existed in the area of #8203;#8203;El Golfo.

After confirming that there was no activity in the north, we proceeded to complete the bathymetry in the south and, after processing the data and informing the committee PEVOLCA, researchers and the press office of the IEO, we will prepare a public report.

Once again sorry. Greetings!

[jand]

Carlos says:

 January 16, 2012 at 14:39


Well.
 It explains that the only one reason we had not reports are only political reasons.
 A volcan hidden with the magical blanket of the Lord of Rings.
 Remember that Sarmiento de Gamboa was making bathymetry in the beggining of december and on the end of december... In this case Sarmiento de Gamboa doesn´t belong to IEO. The owner of Gamboa is CSIC.
 We had not bathymetry not by technycal problems but the politicians and THE SCIENTIST TECHNICIAN thougth the bathymetry are not of general interest in their point of view of civilian defense.
 I can understand this thought from politicians but I can not understand this thought by a scientist technician.
 This event is HISTORICAL for the spanish vulcanism and the thougths of these politicians and this scientist technician were dwarf´s thoughts.
 This event has a point of view of the civil defense but this event is an HISTORICAL event in our country.

Reply


Carl le Strange says:

 January 16, 2012 at 14:46


I would say that they are inexperienced in how to handle an eruption from a public relations standpoint. As well as they do not know enough to know what is important.
 They are not real volcanologists, they are geologists specialising in landslides mostly.

[jand]

Carl le Strange says:

 January 16, 2012 at 15:34


And supposing the adage that Bob gets more active as tremor falls, we should be getting some action soon.
 The tremor dropp quickly earlier today, is usual it does not show on the other stations.
 It is remarkable hos smooth and stable it is now. And irritatingly enough, the hourly plot is deleted by IGN for the exact hour when it happened.
 Here is the 24 hour spectral plot.
 http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2012-01-16&ver=s&estacion=CHIE&Anio=2012&Mes=01&Dia=16&tipo=2

[jand]

Update 16/01 – 15:12 UTC
– A partial collapse of the vent occurred at 11:40. At 11:40, the HT was still at medium strength but the many hydromagmatic explosions were an indication that a partial or complete collapse could happen. Harmonic tremor is minimal at this moment but has a tendency to increase again.

Reply
 schteve says:
January 16, 2012 at 16:00
Hi Judith and all,
Sounds reasonable to me, should see tremor increasing over next few hours if BoB sticks to his usual routine, we have definately seen this before. Armand is usually pretty accurate but he has announced the end of BoB at least twice, so don't believe him if he says that

Reply
 Carl le Strange says:
January 16, 2012 at 16:09
No, it is totally wrong. It seems like ER has gotten it rather backwards.

The tremoring is showing gas release and deep magmatic movement in the magma chamber(s) under Tanganasoga. They can increase and decrease totally independent of Bobs activity.
Though, there seems to be a spatial relationship between the decrease of tremoring, and an increase in Bobs activity, this probably due to gas pressure having been built up which will push out new magma together with the gas.
We will probably see an increase the next 24 hours at Bob, if this is true this time around, we should see the increase within a couple of hours. Activity at Bob though (17 swedish time) very low.

Also, the last time around the cone collapsed we had the large bulge of water shooting out of the water. Nothing like that was visible this time either.
I though think Armand et ál has confused the term "vent collapse" with "tube collapse". There have been a couple of tube collapses happening right before Bobs vent (crater), those are always followed by a marked increase in tremoring, and a subsequent formation of a new vent slightly closer to land. A tube collapse is loose term, we are more likely talking about the tube being blocked as magma sollidifies in the tube and blocks it. Sometimes a blockage gets blown out, and sometimes a new vent is formed.
Terminology is important when talking about these processes.

Reply
 Carl le Strange says:
January 16, 2012 at 16:13
To be clear. What we are seeing today is gas-release stopping under Tanganasoga. With the distinct possibility that a blockage deep in the feeder was removed. We should as I said, soon see new magma entering Bob. It usually takes between 5 and 15 hours depending in the amount of gas pushing it.

[jand]

Denise says:

 January 16, 2012 at 17:29

Carl, do you think that the magma is trying to find a new way up, under Tanganasoga? Many of the recent earthquakes seem to be pointing in that direction. And could this be a different magma chamber than the one feeding Bob, as Bob is today 99 days old marking the second longest duration for Canary Island volcanoes in historic times (which go back to 1585)?

http://www.01.ign.es/ign/resources/volcanologia/jpg/Eventos_HIERRO_10.jpg

[jand]

[jand]

Carl le Strange says:

 January 16, 2012 at 17:48


I love being right.
 Now there is markedly more colour at the water above the vent, rockrolites (pyroclasts) bobbing around and a steamy small patch.
 http://hierroendirecto.movistar.es/

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Carl le Strange says:

 January 16, 2012 at 17:49


Correction, not steam, a whaleload of gasses sprouting out...

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Carl le Strange says:

 January 16, 2012 at 18:03


Both vents are open for business today.
 Close Bob is having a lot of degassing and pyroclasts.
 Then original Bob is pushing gas and silt further out.

"I find the rumour of Bob's death to be highly over-rated"
 Moi

[jand]

Photos taken today.

[jand]

[jand]

[jand]

VolcanoCafe Copied.

Once again Bob has been declared dead, and proving everyone wrong.

Earlier today I noticed a marked drop in the harmonic tremor plot. This was interpreted over the internet to be a sign of Bobs death (again), the feeder tube being blocked up through collapse, and quite a few other theories.

What is actually happening (most likely) is that the high harmonic tremoring is gas being released from the magma chamber(s) that reside under the Tanganasoga central volcano and the adjacent Tinganar fissure. As the pressure builds up, it reaches a critical level, and start to push fresh material and gas through the feeder tube to Bob south of La Restinga.

This has happened numerous times by now, actually so often that one can predict what will happen. What usually follows now is that Bob has an increase in activity starting about 5 to 15 hours after the decrease in harmonic tremoring.

The reason for so many making this error in judgment is that they miss the critical point. Bob is not a volcano. It is a volcanic vent far out on a feeder tube (probably and old magma tube left over from an old fissure eruption). The same types of old lava tubes can be found around the entire island, both above ground, and out under the water. So, judging Bob from what is recorded at CHIE station is not a good idea. Anything showing up there is related to the magma-chamber under Tanganasoga and Tinganar. So, there is first of all a time-lapse between the tremoring and Bob due to travel speed from the chamber to the vent of Bob. Second of all, Bob is a safety valve from the chamber per see. And as such has distinctly different traits than a normal volcanic eruption.

Being that as it may, Bob has now matured as a volcano, and found her rhythm. And the current behavior will probably continue for quite some time. If nothing drastic happens we can expect Bob to stay in action for at least another month.

I often get questions about the possibility of a new eruptive vent opening up at Tanganasoga. I see this as highly unlikely as long as Bob is active, this due to Bobs function as a safety pressure relief valve.

What would then be the likely signs of a Tanganasoga eruption on the way? Well first of all that Bob disappears. If Bob had been quiet for a few days, and we still see high tremoring, and a return of numerous earthquakes, then I would suspect that the feeder tube leading to Bob had been blocked, and that the risk is increasing of an eruption at Tanganasoga due to pressure build up. One should though remember that a lot of other possibilities could be at least as probable. New Bob even closer to land, an eruption close to La Restinga (not so likely due to the tube probably not going under the town, or another of the old lava tubes replacing Bob as relief valve.

I just want to say that you should not trust any rumors about Bobs death. And I would also like to say that we really should need new bathymetric imaging of Bobs volcanic cone. We need to know how close she is to the surface. There are too many rumors right now.

CARL

[jand]

Todays flight.

http://www.youtube.com/watch?v=71wtKStgRZI&feature=player_embedded

[jand]

http://www.fotosaereasdecanarias.com/

[jand]

Yesterday even the charts for Fuerteventura were showing movements one persons comments below copied from volcano cafe.

GeoLurking says:

 January 17, 2012 at 00:56


Might... but the general take is that lower freqs travel further.

I can't even nail down what the velocity is for these signals. Some correlation of artifacts at CHIE showing up at travel times of about 2 km/s. The speed of sound (compressional waves) is about 1.5 km/s in seawater, and upwards of 4.2 to 6 km/s for P-waves (also a compressional wave) in the crust.

But as for the actual path of how they get there... that's a bit undetermined in my realm of thinking. I can't find firm evidence one way or the other. I have seen acoustic artifacts (shots from the research vessel) show up with different travel speeds than quakes that show up in the same spectrograph window time periods.

All you can really make from this is whether the freq is getting stronger or weaker.

By guy feel is that these low freq signals showing up waaay over at CFUE are indicative of a deep source.

As a side note, those freqs are multiples of each other.

Reply

[jand]

Harmonics are picking up again today.