El Hierro

[kevin2003]

Well god knows I'm no spring chicken.[]

[jand]

Back to business.

Comments by Raymond Matabosch.

blog of 66270_Des-roses-and-des - spines will - blog .com


Eruption El Hierro to the day: February 26, 2012.
Sunday, February 26, 2012 at 6: 00 pm


It strange published that the graph of the harmonic tremor is retranscrive as "weak"


a fine line, without more, while hydromagmatiques explosions occur at the level of several vents


and that, since February 23, 2012, the 00 h 00, 45 microearthquakes tangential in the Bay, off the coast of Tacoron where fumes are seen on the plan under the mountain El Julan where residents are detected with fumaroles and water...


Point to be too forward but eruptive events are going to be more and more visible at the level of the water in the hours and the days to come


A large substantive work has been done and the writing will be an article which will be published before February 29, 2012.


26 February 2012 © Raymond Matabosch


SUN 26 FEB 2012 1 COMMENT
Good evening Raymond,.

SUN 26 FEB 2012 1 COMMENT
Good evening Raymond,.


Delighted to see again you.


All I see is a resumption of the "jacuzzi" for 2 days, but this is thin...


Pause or end of eruption, is all that wonder.


Kind regards


François


Fanfoe63 - now at 01 h 09
Hello François


I wasn't party EAP but as the eruption time of lull, I to have benefited, navigation authorities leaving leisure to a zone of 400 metres, for further research into the ins and outs of...


Anything, I can uncover you, prior to publication of my next article, that is neither a pause, next to the little visible manifestations on the level of the plan ' water, or a rash purpose...


We are seeing a different form fissurale with type traps in the marine environment and fumaroles land available... but I will say more in the course of my next article


Kind regards


Raymond


Raymond Matabosch

[jand]

Maps showing at least seven erruptive cones underwater?


http://a35.idata.over-blog.com/540x375/3/98/51/54/cones-La-Restinga-2.1.jpg

http://a10.idata.over-blog.com/540x294/3/98/51/54/cones-La-Restinga-1.jpg

http://a21.idata.over-blog.com/540x296/3/98/51/54/cones-La-Restinga.jpg

[jand]

Eruption El Hierro to the day: February 27, 2012.
Monday, February 27, 2012 at 20: 30


Strange day on the water of the Restinga despite a record of the harmonic tremor standards SHZ, moribund


especially when compared to the registration of the harmonic tremor, same standard SHZ, Tenerife


But good... turn on the Hz scale which is still blocked at maximum for El Hierro...


10 microearthquakes, which one of magnitide. mbLg greater than 2.0, since the 12: 00 a.m., especially concentrated in the area of the mountain El Julan where people continue to see forms fumerolliennes


The situation on the water was with long parallel trails previous days, in the axis of the cracks, and parallel to the coast between La Restinga-Puerto Naos and Tacoron, marking a series of spots with vapour emission and light bouillonnements... Such events show that fissuraux form, resembling the type traps, to poduisent in the marine environment...


That reserve the hours and the days to come? A resurgence of activity at the level of the listed vents? or the appearance of new vents? As Ramon Margalef continues to achieve of bathymetry and the IGN takes the Salvamar of the Guardia Civil... Strange ballet of boats on the water of the sea of Las Calmas for a rash that some would defunct...


27 February 2012 © Raymond Matabosch

[jand]

Blog 66270_Des-rosa and of épines. over-blog.com iron eruption during the night: February 27, 2012. Monday, 27 February 2012 at 20 h 30 day strange in the water of La Restinga despite a record of harmonic tremor, standards SHZ, dying especially if compared with the record of harmonic tremor, standard same SHZ, Tenerife but... move the Hz ladder who is still trapped at its peak in El Hierro... 10 microsismos, one of the magnitide mbLg 2.0 from 00 h 00, concentrated especially in the area of the mount in the Julan, where people still perceive forms fumerolliennes the situation in the water was consistent with the previous days with long stripes parallel to the axis of the cracks, and in parallel to the coast between Puerto NaosLa Restinga and Pinar, marking a series of spots with emissions of steam and baths with bubbles of light... These events show that the spread fissures, resembling the type traps, it is marine poduisent... Reservation that the hours and days to come? An increase in activity in the identified sources? or the emergence of new smokes? Especially since Ramón Margalef continues to carry out the bathymetry and IGN Salvamar monopoly of Civil Guard... Strange ballet of boats in the waters of the sea of the calm for an eruption, which some people want to dead... February 27, 2012 © Raymond Matabosch Mon, February 27, 2012 1 comment

http://a34.idata.over-blog.com/540x355/3/98/51/54/seismes-el-hierro-27-02-2012-copie-1.jpg

[jand]

Blog 66270_Des-rosa and of épines. over-blog.com iron eruption during the night: February 28, 2012. February 28, 2012 at 13 h 15 although few changes, these same zero in the registered graphic of tremor harmonious in El Hierro by IGN, however, major changes in microsismos that after records of several "recalculations" drop in intensity and magnitude, between 0.4 and 0.6... and for some:-either by the sub-affleurence, sinking into the depths of 0 to affouillant focal depth 10-15 km – considered by some residents forgetting the registrations the impossible to locate, most... It is true that the scale of Hz which is tightening the most, these risks are unreadable on the graphs of tremor... In the water in front of La Restinga and on the face and port Noas Pinar, superficial manifestations are identical to those experienced during the day yesterday February 27, 2012. More lines are much more visible, as well as demonstrate that the degassing of the eruption is always active and extends to the... towards the Punta Orchilla... Finally, some rare forms of fumaroles were observed between the morning at El Julan Hill... February 28, 2012 © Raymond Matabosch sea on 28 February 2012 no comments

Now attached photo

http://a21.idata.over-blog.com/540x353/3/98/51/54/seismes-el-hierro-28-02-2012--a-13-h-00.jpg

[jand]

New information officers, appears to be the volcano slows and that still rose a little more, until about 100 meters from the surface...(Henry)


IGN NOTED THE MAINTENANCE OF PROCESS OF NORMALIZAICÓN OF THE ERUPTIVE PHENOMENON OF THE HIERRRO.


28-02-2012... 16: 03 - Ministry of economy, finance and security


They are not expected phenomena in surface even when the cone is located 100 metres of depth, as it confirmed the IEO


The National Geographic Institute (IGN) has confirmed to the direction of the Civil Protection Plan by volcanic risk (PEVOLCA) the process of normalization of the eruptive phenomenon of El Hierro has maintained in all parameters, with a marked reduction of seismicity, deformation and presence of associated gas, noting only a process of degassing in the broadcast area.


Therefore if there is any escalation of the phenomenon in course, they are not expected surface phenomena which involve an increase in the risk for the population of La Restinga even when issuing Centre is 100 metres from the surface as noted by Ramón Margalef, of the Spanish Institute of Oceanography in the recent work carried out in the area.


Given that the process has not been completed, IGN will keep operating the service of monitoring and warning volcanic 24 hours, the center of attention standing in La Restinga, as well as continue the work of the rest of the institutions which are part of the Scientific Committee of the PEVOLCA (CSIC, INVOLCAN, do?)


In this regard, and as it will be recalled that several institutions of the Spanish State agreed a program of actions for the coming months of March, April and may, with different ships which carried out the bathimetrys with a periodicity around 7-10 days. The ships are owned by the Navy, Guardia Civil, society of maritime rescue, General Secretariat of fisheries and the Customs Department of the Ministry of defence; Interior; Building; Agriculture, food and environment; and the Ministry of finance and public administration, respectively.


Evolution


As regards developments yesterday, the tremor signal is registered with low amplitude, barely unchanged, and there were 14 very low-intensity earthquakes. The larger, reached 2.1 on the Richter scale, was felt slightly by the population.


The sign of deformation recorded by stations GPS of IGN, located in the Gulf, show a slight tendency towards the North in the horizontal components. The rest of the seasons and the vertical component remain stable.



See Translation





GOVERNMENT OF THE CANARY ISLANDS: NEWS
www.gobiernodecanarias.org
They are not expected phenomena in surface even when the cone is located 100 metres of depth, as it confirmed the IEO

[jand]

Avcan FB Comment

Good afternoon. Good polemic with the hypothetical end of the eruption. From my point of view, the eruptive process in El Hierro follows its course. The proof is, as has been said above, that the volcanic edifice has grown 20 meters in 20 days, normal thing if it has been issuing washes fluid, which is perfectly compatible with a low signal of tremor, with the absence of explosions and the decline of earthquakes in the specific area of the eruption. On the other hand the phenomena associated with deformation, not only do not present important deflation, but that, as Henry points out, it seems that they increase in the horizontal (IGN) and also, slightly in the vertical (Nagoya) in the Northern seasons. The seismicity located in areas of tectonic weakness, however, is still there, even with clear tectonic earthquakes (the bark breaks) that rub the base of the own lávico building on the island. The question we must ask is: does this new situation to gradual exhaustion of the underwater eruption to La Restinga? It will have to wait for a new bathymetry to know the evolution of the volcanic edifice. If a new bathymetry shows new increases in height, will have to be very, very vigilant. 100 meters begins to be a critical depth for contacts water/magma and the development of dynamic hidromagmáticas, less than 100 meters (if the building continues to grow) poses a clear danger that can convert at risk if adequate measures are not taken. All of this is conditioned by the outcome of a forthcoming bathymetry. We must also question if the change in seismic activity responds to new contributions of magma to the volcanic system - circumstance that must be accompanied by processes of deformation - or to a general process of relaxation of the island which manifests itself in more pronounced way, there where this weighs more: the area of summits and the Tanganasoga. In any case all these doubts should be clarified in a few weeks. The important thing now is be aware of these developments and of course wish that we really are in the final stages of the process, without freatomagmáticas and eruptive manifestations on Earth reactivations. That would not be good for the island or its inhabitants. (Elena).

[jand]

Update 29/02 – 07:55 UTC
 - 3 earthquakes so far today. Magnitudes : 1.1, 0.8 and 1.3. Depths in between 7 and 12 km.
 - unchanged harmonic tremor
 - continuing micro-seismicity
 - no visible stain or jacuzzi on the eruption webcam

--------------------------------------------------------------------------------

Update 28/02 – 23:55 UTC
 - 8 earthquakes today
 - no revival of HT but as seen in the Las Calmas sea, degassing is still continuing
 - the new depth data shows that a Surtseyan eruption is imminent IF some stronger activity would start.  This may still happen during the current eruption process.

[jand]

Last IEO update.

http://www.ieo.es/apartar/ieoprensa/hierro/hierro-leg9.pdf

Reply


Carl le Strange says:

 February 29, 2012 at 09:11


And there came the nugget
Thanks!

Bob has been busy, I counted to 6 vents on the image, all around the original Bob cone, and one biggish transverse fissure up on the ridge.
 The last one is interesting, it is new since the last bathymetry, and it is actually higher then Bob.
 I guess that is the point they are stating when they say 100 meters now. Very interesting indeed.
 It is the first real evidence we have of the vent closer to the port.
 The big rise behind it in grey is of course the final slope to the Island.

This could if the activity at Bob pics up be bad news. First of all, for that fissure to open up the activity of Bob must have stoped completely, otherwise the rift would not have opened up. Secong of all, that fissure is really much closer to the beach, and starts much closer to the surface, if that builds onwards it does not need a lot of material to build up a new cone that will affect the surface.
 And that close to La Restinga, well, bad news.
 We should though remember that the activity is minimal at the moment. But if it built up some 20 meters allready, it could quickly reach the surface if new magma arrives.
 Second of all, worst case scenario, new magma and new fissure even closer to shore.
 Now we know why they have so many boats out there. They are tracking this fissure.

Reply


Carl le Strange says:

 February 29, 2012 at 09:17


Two more nuggets.
 The temperature is even down to 180 meters depth, and the speed of sound in the water increases from the surface down to 180 meters, and then quickly falls.

This tells us that there is a large warm area down there. Also, speed of sound increases as temperature increases, so I would surmice that the temperature actually increases downwards.
 The marked drop in the speed is due to the temperature gradient shift, and a saline boundary.

[jand]

464 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 29 February 2012-11: 00 pm peninsula - earthquake and volcanic activity is continuing moderate seismicity today in the area of summits on the side of the Julan at the height of the Tanganasoga. Yesterday was in the Gulf Escarpment to the East of the Tanganasoga and in the mar de las Calmas. Continuous played quite microsismicidad detected but not located in the spectrogram. The signal of volcanic tremor continues in the eruptive area of la Restinga, which is kept low but since antesdeayer this uploading, so it has already doubled the intensity of the signal. New earthquakes 5 + 11revisados low manitud. The new earthquakes between 0.8 and 1.7 magnitude. Depths to 7.4, 8.6, 11.0, 11.6, 16.8 km). The day before yesterday 14. Yesterday 8. Today van 3. In total van 12466 earthquakes located in El Hierro by IGN from 9: 00 a.m. of the day 19 July 2011 (Henry).


http://www.avcan.org/Mapas/AVCAN2842.jpg?d=1330509594

[jand]

Update 29/02 – 15:46 UTC
 - 4 earthquakes so far today
 - In the many mails we received from Joke yesterday and after midnight today (yes, she often works until after midnight), something escaped our attention. An earthquake at 05:02 yesterday morning with an epicenter to the east of the La Restinga reef (in between El Hierro and Tenerife).
 In a message later yesterday and before Joke had seen this earthquake location, she told us about a stain in that same area. When climbing montaña La Restinga, she usually looks both sides of the La Restinga. She found it strange to see a stain in that part of the sea (especially as we had no more stains above the main vent for many days). She indicated the stain spot in her image series from yesterday afternoon, adding a map with the location.  There are no signs that this is a viable reason for a new emission vent as the quake was reported at a depth of 20 km, but the least we can say is that this event is rather unusual and not immediately explainable, unless the stain drifted away from the main vent.

[jand]

volcanocafe.

Alan C says:

 February 29, 2012 at 18:56


@ Carl/All
 The batthymetry picture of Bob – I don't like the look of those odd pinacle-like structures at the summit; they look like lava-dome spines? If they are and the conduit is plugged and not yet done with....

http://www.ieo.es/apartar/ieoprensa/hierro/hierro-leg9.pdf

[jand]

http://www.ieo.es/apartar/ieoprensa/hierro/hierro-leg10.pdf

Interesting but will need to be translated into English.

[jand]

NOTA 465 AVCAN - ACTIVIDAD SISMO-VOLCÁNICA - ISLA DEL HIERRO - 01 MARZO 2012-11:00h peninsular - La actividad sismo-volcánica continúa moderada, con sismicidad Hoy que está difusa en el Mar de las Calmas y uno en el Julan y ayer tarde en el Golfo. Continua viendose bastante microsismicidad detectada pero no localizada en el espectrograma. Continúa la señal de tremor volcánico en la zona eruptiva de la Restinga, que se mantiene bajo aunque desde el día 26 de febrero esta subiendo sin prisa pero sin pausa. Nuevos sismos 5+6 revisadosde baja manitud. Magnitud de los nuevos sismos entre 1.3 y 0.6. Profundidades a 9.9, 10.5, 11.0, 11.4 y 11.5 km). Anteayer 8. Ayer 4. Hoy van 4. En total van 12477 sismos localizados en El Hierro por el IGN desde las 9:00h del día 19 de Julio de 2011 (Enrique).

http://www.avcan.org/mapas/#8203;AVCAN2850.jpg?d=1330595302

[jand]

Note 465 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 01 March 2012-11: 00 pm peninsula - earthquake and volcanic activity is continuing moderate seismicity today which is diffuse in the Mar de las Calmas and one in the Julan and yesterday afternoon in the Gulf. Continuous played quite microsismicidad detected but not located in the spectrogram. Continues the signal of volcanic tremor in the eruptive area of la Restinga, which stays low although from February 26 day is going up slowly but surely. New earthquakes 5 + 6 revisadosde low manitud. The new earthquakes between 1.3 and 0.6 magnitude. (Depths 9.9, 10.5, 11.0, 11.4 and 11.5 km). Yesterday 8. Yesterday (4). Today van 4. In total van 12477 earthquakes located in El Hierro by IGN from 9: 00 a.m. of the day 19 July 2011 (Henry).


http://www.avcan.org/Mapas/AVCAN2850.jpg?d=1330595302

[jand]

El mapa de la sismicidad de lo que llevamos hoy, se ve que está difusa en el Mar de las Calmas  y uno en el Julan y ayer tarde en el Golfo. Por la mañana en la zona de cumbres del lado del Julan a la altura del Tanganasoga. Antesdeayeryer fue en el escarpe del Golfo al Este del Tanganasoga y en el mar de las Calmas. Los sismos de estos últimos dias y los nuevos revisados del 26 y 27 continuan produciendose en la alineación NNE-SSW desde Frontera al Mar de las Calmas y otra cosa es que los sismos parece que se concentran en la zona central de la Isla y hay algunos más en el Mar de las Calmas (Enrique).
9 hours ago · Like ·  11   Map of the seismicity of what you have today, we see that it is diffuse in the Mar de las Calmas and one in the Julan and yesterday afternoon in the Gulf. In the morning in the area of summits on the side of the Julan at the height of the Tanganasoga. Antesdeayeryer was in the Gulf Escarpment to the East of the Tanganasoga and in the mar de las Calmas. Earthquakes of these last few days and the new revised of the 26 and 27 continue occurring in alignment NNE-SSW from border to the Mar de las Calmas and another thing is that earthquakes seems they are concentrated in the central area of the island and there are some more in the calm sea (Henry).
9 hours ago · Like · 11
SISMOS DÍA 29 FEB. - Rojo (4)
 SISMOS DÍA 28 FEB. - Verde claro (
 SISMOS DÍA 27 FEB. - Violeta (20) - 6 nuevos
 SISMOS DÍA 26 FEB. - Rosa (22) - 10 nuevos

[jand]

Sismo a las 19:11 en la zona bajo la cumbre del Malpaso. Veremos donde lo colocan y la magnitud del mismo.

Earthquake at 19: 11 in the area under the Summit of the Malpaso. We'll see where placed it and the magnitude of the same. (Translated by Bing)

Reply

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

[jand]

Two sismitos a while ago this afternoon, one of 2.1 and another 1.9 in the area of the mar de las Calmas, the first mas in the sea and the second just off the coast to the West of la Restinga, to more depth. (Henry)


1129677 03/01/2012 19: 07: 52 27.6311 - 18.0587 12.4 2.1 mbLg SW EL PINAR.IHI
1129681 03/01/2012 19: 46: 21 27.6436 - 18.0218 17.7 1.9 mbLg SW EL PINAR.IHI


http://www.avcan.org/Mapas/AVCAN2854.jpg?d=1330634558


EARTHQUAKES DAY 01 MAR. -Blue clear (6)
EARTHQUAKES DAY 29 FEB. -Red (4)
EARTHQUAKES DAY 28 FEB. -Green course (
EARTHQUAKES DAY 27 FEB. -Violet (20) - new 6
EARTHQUAKES DAY 26 FEB. -Rosa (22) - 10 new


If someone has felt something at these times, don't forget to fill in the questionnaire of the IGN as it has been felt...


http://www.01.ign.es/IGN/layoutIn/geofisicaCuestionarioMacrosismico.do

[jand]

And another one .



1129682  01/03/2012   20:17:02   27.6503   -18.0629    14   2.0    4   SW EL PINAR.IHI

[jand]

Movements are being felt in the North of the Island.

Avcan FB Comment.

el de las 19:07 se sintió, leve, en Los Mocanes, Frontera
 y antes, a las 18:30, algo hizo tintinear los objetos en las estanterías.
 llenando el formulario...

of the 19: 07 felt, mild, in Los Mocanes, border and earlier, at 6: 30, something he jingling objects on the shelves.
 by filling out the form... (Translated by Bing)

24 minutes ago · Like ·

[jand]

http://www.facebook.com/l.php?u=http%3A%2F%2Fvimeo.com%2F37752523&h=zAQH_Ey94AQFNeNELJEVGAN_0uLNwMbr0WAYYdkq5gX5A2Q

Stunning Video of the Canary Skies.

[jand]

Another volcano has become active this time in Mexico.

Popocatepetl active.
 Posted on AVCAN
 The National Center for Disaster Prevention (Cenapred) reported that in the last hours the volcano Popocatepetl had six exhalations of low intensity, accompanied by emissions of water vapor and gas. He said that at 4:30 Thursday morning occurred the most intense, which was accompanied by small amounts of ash, also during the night glow was observed, the other volcano monitoring parameters remain without important changes.
 http://impacto.mx/nacional/nota-33762/Suman_seis_exhalaciones_del_Popocat%C3%A9petl

[jand]

Yesterday there was an earthquake 2.00 in the North West of the Island out in the open ocean,

There has been discussions on this as copied below.


KarenZ says:

 March 3, 2012 at 01:43


And a on a very last note for tonight: there is some serious red lining on the Canaries stations; even a small hint of red on CHIE.

http://www.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2012-03-03_00-01&estacion=CHIE&Anio=2012&Mes=03&Dia=03&tipo=2&hora=00-01

http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EOSO_2012-03-02&ver=s&estacion=EOSO&Anio=2012&Mes=03&Dia=02&tipo=2

http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EGOM_2012-03-02&ver=s&estacion=EGOM&Anio=2012&Mes=03&Dia=02&tipo=2

Reply



CarlosB says:

 March 3, 2012 at 01:49


Yes Karen
 For me in the last 24 hours is the 1st time that we can speak of a true seismic reactivation if this trend go on.
 I´m going to looking for when was the last time we saw a deep EQ in the sea at northern as when happened the second seismic wave on mid-end october.
 In the spectrogram we can see more vertical yellow lines that means gases and energy are working inside and for me the eruption was never stopped neither in any moment.

Reply


CarlosB says:

 March 3, 2012 at 01:57

An EQ of this characterstics (mag 2 at north sea) had not given since january 1th.

Reply

Hattie says:

 March 3, 2012 at 02:34

Thanks Carlos. Not sure if you noticed this one yet, it is right near the surface. I am not sure of the mag.
 http://www.01.ign.es/ign/resources/volcanologia/html/eventosHierro.html

Reply


 March 3, 2012 at 02:40


Sí. Y además ese punto 27.80-18.05 fue el punto principal de entrada de la segunda oleada sísmica de finales de octubre desde el norte. Seguimos esperando que se nos dé la medición de emisión difusa de co2... Un dato que siempre se ha dado y que no se da desde el 29 de enero. A quien le corresponda; Pevolca y/o Iter... que manía entre todos de no dar datos y dar la impresión de que ocultan cosas... Con lo fácil que es poner los datos en la mesa y se acaban las suspicacias. Eso sí, luego de palabra para servir al ciudadano están todos, pero datos no sueltan ni uno.

Yes. And that point 27.80-1805 was also the main entry point of the second wave seismic from the end of October from the North. We are still waiting for give us the measurement of diffuse emission of co2... A fact that has always given and not given since January 29. To whom may concern it; Pevolca and/or Iter... that mania among all not give details and give the impression that things hide... With how easy that is to put the data in the table and just suspicions. That Yes, after Word to serve the citizen they are all, but data release even one. (Translated by Bing)

[jand]

March 3, 2012 at 07:23

http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EHIG_2012-03-03&ver=s&estacion=EHIG&Anio=2012&Mes=03&Dia=03&tipo=2

http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EOSO_2012-03-03&ver=s&estacion=EOSO&Anio=2012&Mes=03&Dia=03&tipo=2

On the above graphs I think Karen has mentioned this before the yellow and red lines are getting stronger (and they are on a couple of more of the islands).

Please could someone explain what the yellow block of colour and red lines exactly mean.

Thanks

Reply


Also CHIE does not have any redlines .

As the main earthquakes are happening on El Hierro why does CHIE not have any red line and CHIE does not have any straight yellow lines as such like the stations of the other islands are showing CHIE just has a block of yellow?

Reply


GeoLurking says:

 March 3, 2012 at 07:46


CHIE's gain is cut way back.

With the gain levels set that far back, it's unlikely that CHIE would see much at all. This has bee verified by the comparing the arrivals of distant quakes on the various Canary seismos.

How much, I don't know. Carl may have an idea but I have no experience with seismos (or the different models) so I can't make any estimates.

I can only state what I have seen.

As for the red and yellow lines...

The spectral plot shows the relative power at different frequencies. On the plots, the vertical axis the frequency in Hz. Blue – very weak, green – stronger, yellow – stronger still, red, really strong.

The frequency tells you a bit about the source for the noise. Boats will have somewhat steady tones that drift up and down in frequency as it adjust it's prop speed or moves around. You will never see them getting down into the 1 hz freq on a normal basis.

Gas formation, through boiling or such, will show up as a broad spectrum (covering several hz), but won't necessarily have a really low freq component. Quakes... close quakes, will have a nice solid low freq component and will cover several hz in range.

Man-made/goat made noise won't have real low freq.

Gases coming out of solution may be the source of the 0.44 / 0.59 hz signal that we have seen on a lot of outlying stations... due to the range, the possible source is deep.

Stations on El Hierro with the low end tremor that is not on the outlying stations, may be magma movement nearer the surface.

[jand]

Carlos B. says:

 March 3, 2012 at 08:11


Sabinosa deformation.
 http://www.seis.nagoya-u.ac.jp/sagiya/canary_gps/SABI.pdf

Reply

[jand]

Europa Press Translated.

Good morning!!I spent a story, which I believe, it has not been, interesting.Mapped the volcanic cone of El Hierro the eruption caused a significant environmental impact but that it was "predictable" VIGO, 2 Mar. (EUROPA PRESS) - researchers of the Institute Spanish of Oceanography (IEO) who have made the scientific campaign on the island of El Hierro on the occasion of the eruption of a new submarine volcano found the youngest volcanic cone never mapping. The mission took place on the ship 'Ramón Margalef' of the IEO, that reached Vigo this Friday after four months of work in the Canary Islands.

Thanks to the obtained maps could follow the evolution of the volcano, which in the early days of the investigation, had a diameter at the base of 700 meters, a height of 100 and a crater of about 120 meters in width. In addition, the nature of water has been studied and has advised the authorities responsible for the safety of population.

One of the participating oceanographers in the Bimbache campaign - that bears his name of the first settlers of the island and had a total of 12 stages-Jesus Rivero, explained that during the mission - launched on 24 October and concluded last Monday-, gave information which allowed determine the severity at the time of the eruption, thus collaborating in assessing the volcanic risk.

In addition, it has indicated that the have been able to map the youngest volcano has been "something very special" because, in addition, it is the first time that was done in an erupting volcano. "At this time, with technological development there, have been able to have information that years ago was unthinkable" has indicated, while added that there is no precedent in the fleet Spanish or Spanish waters.

The oceanographer has claimed that for the IEO possibly of El Hierro is a "one-time" event, given the low probability that recur, for them, the birth of a submarine volcano.

ECHOLOCATION on the techniques used for the study of the volcano, which is now closer to the surface than at the beginning, although it is still far from reaching it; He pointed out that you it's "echolocation" systems which operate by emitting a sound and studying echo that produces - as well as bats and dolphins-.

In any case, the scientist highlighted that data are used for the assessment of the risk at the time of the eruption but forecasts do not allow. On the possibility of a new eruption, has manifestad that a volcanologist would be who would have to evaluate it, although it has indicated that the campaign of study saw that activity has declined, that material to the column of water emissions are lower and that has virtually disappeared noise output of lava, it "seems the process sends".

The ship 'Ramón Margalef' has conducted studies of physical, chemical, geophysical and biological oceanography. In addition to echolocation systems, it is also equipped with the robot Liropus 2000, which allows filming seabed, measuring constants such as temperature, pressure, salinity, studying flows and take samples.

ENVIRONMENTAL impact As explained the Chief of fleet of the IEO, José Ignacio Díaz, it has been found that the activity of this volcano, which is still active, has had a "significant environmental impact", even though it "was predictable". Thus, after ensuring that life which disappeared in the area of the volcano will once again be reborn when volcanic activity dies.

The members of the expedition explained that at times was could feel the boat underwater volcano explosions, although they emphasize that it was not something that made them "feel fear". Also, they have pointed out that Yes is detected in the area "hydrogen sulfide smell", but have ruled out that it is toxic.

With regard to the conduct of the ship, both scientists and the captain, the Galician Luis Gago, stressed his good behaviour, despite this being his first mission - the ship was still in evidence when he moved to the Canary Islands. "You answered phenomenon", highlighted Gago.

Once the ship has reached this Friday headquartered in Vigo, there will be new evidence pending as well as maintenance. Future campaigns will be in the Cantabrian Sea and the Gulf of Cadiz. source Europe press (Translated by Bing)

[jand]

Update 04/03 – 08:52 UTC
 ETNA is currently erupting.  Click here for the link to the ETNA webcam. Many thanks to ER readers New and Nataly to brief us about this new paroxysm (eruption).

Update 04/03 – 08:50 UTC
 - Only 1 M 0.8 earthquake so far today
 - Continuing minor HT

--------------------------------------------------------------------------------

Update 03/03 – 23:55 UTC
 - Finally we had 7 earthquakes today and all of them where above M 1.1

[jand]

Note 468 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 04 March 2012-11: 00 pm peninsula - earthquake and volcanic activity is continuing moderate seismicity today with one in Julán. Yesterday was in a localized area in the area of summits and in the Mar de las calmas. Continuous played quite microsismicidad detected but not located in the spectrogram. Continues the signal of volcanic tremor in the eruptive area of la Restinga, which is no longer upload but is mantieneen low levels after upload from the 26 of February without pause, now more than three times the signal is lower of that day. New earthquakes 4. The new earthquakes between 0.8 and 1.6 magnitude. Depths to 8.7, 10.2, 213.9 and 14.2km. Yesterday 7. Yesterday 7. Today is 1. In total van 12496 earthquakes located in El Hierro by IGN from 9: 00 a.m. of the day 19 July 2011 (Henry).


http://www.avcan.org/Mapas/AVCAN2877.jpg?d=1330854137

[jand]

EARTHQUAKES DAY 04 MAR. -Brown (1)
EARTHQUAKES DAY 03 MAR. -Dark blue (7)
EARTHQUAKES DAY 02 MAR. -Yellow (7)
EARTHQUAKES DAY 01 MAR. -Blue clear (
EARTHQUAKES DAY 29 FEB. -Red (4)
EARTHQUAKES DAY 28 FEB. -Green course (
EARTHQUAKES DAY 27 FEB. -Violet (20) - new 6
EARTHQUAKES DAY 26 FEB. -Rosa (22) - 10 new


The map of the seismicity of what you have, today we have one in the area of the julán, near cala Pinar in land and yesterday focused 4 earthquakes close together in the area of summits and several by the mar de las Calmas. Antesdeayer had several from the accepted in the N in the sea to the South passing through all areas but some aligning in the address NNW-SSE and NNE-SSW. The previous days there is seismicity that looks it is diffuse in the calm sea, the Julan, in the Gulf. 29 In the morning in the area of summits on the side of the Julan at the height of the Tanganasoga. 28 was in the Gulf Escarpment to the East of the Tanganasoga and in the mar de las Calmas. Earthquakes of these last few days and the new revised of the 26 and 27 continue occurring in alignment NNE-SSW from border to the Mar de las Calmas and another thing is that earthquakes seems they are concentrated in the central area of the island and there are some more in the calm sea (Henry).
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