El Hierro

[jand]

This well may be my last post Pevolca have said today the erruption has ended.

But who knows!!!!!!


The Scientific Committee of the Plan of Civil protection by volcanic risk in the Canary Islands (Pevolca) has given this Monday ended a volcanic eruption, which began almost five months ago, on October 10 last year, when in the calm sea, in the South of the island of El Hierro, became visible the emission of pyroclastic.


The sismovolcánica crisis began July 19 in El Hierro and since then the National Geographic Institute (IGN) has registered 12.503 seismic movements until this Monday, on land or in water close to El Hierro.


The chronology of the most relevant facts of the eruptive process of El Hierro is as follows:


2011:


19 jul-begin to register the first tremors in the municipality de Frontera (El Hierro), according to the National Geographic Institute (IGN).


27 sep-half a hundred border neighbors are evicted and the Roquillos tunnel is closed to traffic.


8 October-an earthquake of 4.3 degrees, causes landslides.


10 oct-occurs underwater volcanic eruption, about five kilometres from La Restinga and 1,000 metres of depth, in the mar de Las Calmas.


11 oct-early warning of volcanic risk becomes red level and ordered the evacuation of La Restinga.


12 oct-located at sea two spots of sulphur, 1.5 or 2 miles from the coast, which demonstrate a rash with two foci, to about 500 and 750 meters of depth.


14 oct-comes the scientific vessel "Professor Ignacio Lozano".


15 oct-the stain of magma and gases is approaching the coast. Close access to La Restinga and prohibits the flight of helicopters and airplanes.


21 oct-a Scientific Committee is.


23 oct-arrives at the island the Oceanographic ship "Ramon Margalef".


25 oct-Spanish Institute of Oceanography located two underwater lights and a new volcano in 100 meters high, with a diameter at the base of 700 metres and a crater of 120 meters.


2 nov-recorded earthquakes of up to 4.4 degrees.


4 nov-closes the tunnel of the Roquillos and 11 homes of the tips are evicted.


5 nov-evacuated for the second time the population of La Restinga. Perceived columns of steam and ash several meters above the surface of the sea.


6 nov-the emission of CO2, reaches maximum levels.


8 nov-the submarine volcano returns to lead to another outbreak of steam and ash on the surface of the water.


9 nov-banned access to the coves of the South of the island close to the focus of the eruption.


11 nov-recorded a seismic movement of 4.6 degrees on the Richter, of far greater intensity scale.


14 nov-authorizing the return of residents to La Restinga.


25 nov-cancelled measures for civil protection on the island before the stability of the volcanic phenomenon.


7 Dec-confined to the maritime area on the volcano the red light by eruption. The rest of the iron passes to hold the color "yellow" indicator of volcanic risk.


10 Dec-for the first time since July 17, are not registered earthquakes.


28 Dec-iron volcano returns to issue material and is seen bubbling.


2012:


19 Jan-scientists set out the top of the submarine volcano to 130 meters of depth.


5 mar-the Scientific Committee of the Plan of Civil protection by volcanic risk in the Canary Islands (Pevolca) thus finished the volcanic eruption

[woe10]

The last post   Only took you 6 months.

[kevin2003]

[Paddster]

Great pic Kev ! You have a knack for that pal........

[jand]

Well well Well guess what a day later and another announcement to say although the erruption of Bob has come to an end the Volcanic activity stills continue.

Well it's official.... Cone 88 m from the surface of the sea and who has completed this episode of volcanic eruption in the Restinga.... Although you have not completed the volcanic activity on the island of el hierro, which continues, so will continue monitoring (Henry).
THE SCIENTIFIC COMMITTEE OF THE PEVOLCA THUS COMPLETED THE UNDERWATER QUQE ERUPTION WILL START IN OCTOBER ON THE IRON.


05-03-2012... 15: 54 - Ministry of economy, finance and security


Volcanic process continues by maintaining surveillance system and the periodic bathimetrys


The Scientific Committee of the Plan of Civil protection by volcanic risk has confirmed, with the unanimous approval of all members, that the underwater eruption that began in October in El Hierro has concluded. Remains, however, the volcanic process begun on 17 July that anomalies are still registering at both deformation and seismicity parameters.


The continuity of this process also requires to maintain a scientific monitoring system until it becomes the parameters prior to July of last year. Most of the scheduled bathimetrys shall also be maintained.


These were the conclusions of the meeting of the Scientific Committee, which has taken place tomorrow at the headquarters of the Academy Canaria of security of Santa Cruz de Tenerife, in which participated the director-general of security and emergencies, Juan Manuel Santana; the subdelegado of the Government in the Canary Islands, Guillermo Díaz Guerra; and by videoconference, the general director of protection Civil of the Ministry of the Interior, Juan Antonio Díaz Cruz, and the Minister of security of the Cabildo of El hierro, Maria of the Carmen Morales, as well as the mayors of El Pinar and border.


Juan Manuel Santana explained that "this situation implies a valuation of Civil protection measures which are in force once all data are analysed in depth".


For its part, and from the Ministry of the Interior confirmed the maintenance of the bathimetrys scheduled for the next three months, but with a lower frequency is "given that the phase in which we are not of risks for the population", he clarified the subdelegado of the Government.


In this sense, morning will the boat of rescue maritime Adhara held a bathymetry, to later succeed four more, the last of them in the middle of the month of May.


Bathymetry of the Ramon Margalef


On the other hand, the Spanish Institute of Oceanography has specified this morning, in his final report on the campaign by the vessel Ramón Margalef on 24 February, the cone volcanic submarine is located 88 meters deep.


This increase in height, according to scientists at the IEO, was due to a slight increase in volume in the deposits of the upper course, especially in the cone, which is not associated with an increase in activity that has been a significant decrease in the presence of feathers of emission and the total disappearance of noise in the ecogramas.

[jand]

Lots of discussions about the statement yesterday by Pevolca someone has commented the tremor now is actually getting stronger.

Compare the tremor on February 28: http://www.02.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2012-02-28&ver=s&estacion=CHIE&Anio=2012&Mes=02&Dia=28&tipo=1 with yesterday March 5: http://www.02.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2012-03-05&ver=s&estacion=CHIE&Anio=2012&Mes=03&Dia=05&tipo=1 think is stronger, and it cannot be the wind, because it is constant for a few days. (Translated by Bing)

[jand]

VolcanoCafe


Meanwhile back on El Hierro, no easing off the red in the low frequencies on the spectrograms yet:

http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EGOM_2012-03-05&ver=s&estacion=EGOM&Anio=2012&Mes=03&Dia=05&tipo=2

http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EOSO_2012-03-05&ver=s&estacion=EOSO&Anio=2012&Mes=03&Dia=05&tipo=2

And a hint of red on CHIE (easier to see if you change the zoom to 50%) http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2012-03-05&ver=s&estacion=CHIE&Anio=2012&Mes=03&Dia=05&tipo=2

Reply



KarenZ says:

 March 5, 2012 at 23:34


And the displacement for FRON to ALAJ, IZAN, TN03 & HI01 is showing a small increase. While the displacement for FRON to HIO2, 3 and 4 are showing a small decrease.

http://www.ign.es/ign/resources/volcanologia/html/deformacion.html

[jand]

Carlos B. says:

 March 6, 2012 at 12:33


Comment of this morning from Itahiza (IGN technician).

The question was formulated by Julio Castillo:
 "Today the tremor amplitude is triple tha was on February 28th"

Answer of Itahiza (IGN):
 "Look now at the same time in CAN station and you'll see the same background noise probably caused or weather conditions and sea state ......"

Reply


KarenZ says:

 March 6, 2012 at 12:55


Erm...the spectrogram has been building since 28/02/2012 on all stations.

Reply

[jand]

Volcano Cafe

El Hierro

IGN and Pevolca have given us the final good bye of the volcanic vent affectionately known as Bob. It is the fifth time that they declare that the activity is dead. I also note that they claim that they "have put an end to the eruption". I for one did not know that humanity could put an end to any eruption.

In the same missive they say that there is still tremoring and inflation going on, and that the earthquakes are ongoing. And I who thought this was signs that you should not state that an eruption had ceased.

On the contrary the volcano seems to have been rather active, and has by now reached a distance of only 88 meters from the surface. This with the above given signs make the Pevolca statement rather iffy in my opinion.

Another thing is that the low level harmonic tremor has steadily increased for a week; it is best seen on the EOSO and EGOM stations. This tremor at 0.59 and 0.3 respectively is a sign that most likely is associated with deep magmatic movement. Due to the wave-length a wave of such a low frequency cannot build in a narrow tube or small magmatic chamber. The increase probably means that new magma is moving upwards.

Either we should see new activity at the old vents around Bob, or a new vent formation will take place in the coming week or so.

[jand]

CarlosB says:

 March 6, 2012 at 15:32


The issue of the surface distance of Bob´s cone at 88 mts...
 I understood they say more or less that it is not the cone or volcanic building but deposits of material of the upper course.
 Clogging?

Reply


Carl le Strange says:

 March 6, 2012 at 15:41


Let us hope that it is not extruding a lava dome.

Reply




KarenZ says:

 March 6, 2012 at 15:55


@Carl, You say "This tremor at 0.59 and 0.3 respectively is a sign that most likely is associated with deep magmatic movement. Due to the wave-length a wave of such a low frequency cannot build in a narrow tube or small magmatic chamber. The increase probably means that new magma is moving upwards."

What size magma chamber / tube would be needed?

Reply

[jand]

March 6, 2012 at 18:30

http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CFUE_2012-03-06&ver=s&estacion=CFUE&Anio=2012&Mes=03&Dia=06&tipo=2

Please could someone explain the graph of CFUE today.?
 Lots of yellow stripes and a definate redline?
 Is she picking up deep magma on the move?

Reply


eswviva says:

 March 6, 2012 at 19:07


probably manmade. same as EOSO
 http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EOSO_2012-03-06&ver=s&estacion=EOSO&Anio=2012&Mes=03&Dia=06&tipo=2

Reply



KarenZ says:

 March 6, 2012 at 19:56


Verticle yellow stripes are local noise & probably man-made: they do not connect to the horizontal yellow & red bands; and, they start at the start of the working day.

The lower frequency yellow and red bands may be noise from El Hierro & may indicate that magma is still moving.

Reply

[jand]

OT Video of Pyroclastic flow at Etna 4th March.

Amazing to watch .

http://www.youtube.com/watch?v=aXbzbPlnAF4

[jand]

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

There has been earlier this morning a 1.5 mg earthquakes at only 7km depth.


1130640 07/03/2012 02:51:14 27.6450 18.0989 7 1.5 4 SW EL PINAR.IHI

Reply

[jand]

And another one an earthquake  a 1.9 mg at a deep depth of 37km and in an unusual position on the west coast.

1130657   07/03/2012   06:12:16   27.7435  18.172  37   1.9    4   W FRONTERA.IHI

[jand]

Volcano cafe



http://www.02.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EHIG_2012-03-07&ver=s&estacion=EHIG&Anio=2012&Mes=03&Dia=07&tipo=1

La Palma graph is showing stronger movements of magma since midnight.

Please correct me if iI am incorrect.

Reply


 March 7, 2012 at 06:51

http://www.02.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EHIG_2012-03-07&ver=s&estacion=EHIG&Anio=2012&Mes=03&Dia=07&tipo=2

GeoLurking says:

 March 7, 2012 at 07:37


It's not that magma is necessarily moving. It could be, but with the instrumentation there is no way to actually know that it's moving.

What we have are indications of noise, and that noise/tremor seems to be from a deep source.

The noise could be moving magma, or it could be degassing magma.


Gran Canaria and La Gomera are the same ?

http://www.02.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EOSO_2012-03-07&estacion=EOSO&Anio=2012&Mes=03&Dia=07

http://www.02.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EGOM_2012-03-07&estacion=EGOM&Anio=2012&Mes=03&Dia=07

Reply


 March 7, 2012 at 06:56


http://www.02.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EGOM_2012-03-07&ver=s&estacion=EGOM&Anio=2012&Mes=03&Dia=07&tipo=2

http://www.02.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EOSO_2012-03-07&ver=s&estacion=EOSO&Anio=2012&Mes

[fifi]

How many times have PEVLOCA said that the eruption is over now? My guess is that it is just taking another rest.[]

Canarias7 article....

Volcano without bubbling or stain
The tremor signal of the volcano of La Restinga is at its lowest. Also seismicity, but the terrain deformation and gas continue to yield data that is not tripping over themselves to terminate the eruption. Furthermore, the eruptive cone is already at 100 meters from the surface.

In December, almost everyone was convinced that El Hierro volcanic crisis came to an end. However, later that month the rash showed the world more actively than ever. Not only was there a bubble in the record, but the magmatic material that emerged was more important than it did months ago. For two weeks, the volcano of La Restinga seems to have taken a breather. On 23 surfaced rocks some important dimension, but nothing like the beginning of the month. The bubbling, an indication that the volcano is venting gasses, barely visible from the coast. Also the stain seems to have faded.

Despite these signs, the volcano continues to grow and so indicate the recent work carried out in the eruption of the research vessel Ramon Margalef, who situated and the cone 100 meters from the surface. Carmen Lopez, a researcher at the National Geographic Institute (IGN), says the volcano of La Restinga takes days to "stable" and that, in fact, since the eruption began on 10 October 2011 has never spent so much time with an activity visible on the surface so low and with a tremor signal "in the bottom".

[jand]

Researchers who have been following the evolution of the magma revitalization of El Hierro and the eruption of La Restinga considered that the permanent monitoring of the island volcanic edifice has to keep at least for the next two years.


Instituto Geográfico Nacional, the body responsible for the volcanic monitoring in Spain, will keep the entire instrumental that has been deployed in El Hierro as the magma reactivation process does not end, said yesterday the Director of IGN in the Canary Islands, María José Blanco, who also advanced that they continue the campaigns on the various parameters that were scheduled. The Instituto Volcanológico de Canarias (Involcan) will also maintain all of its permanent instrumentation on the island and the punctual measurements of gases and water from wells and planned galleries, yesterday said its Coordinator, Nemesio Perez.


Ramón Ortiz, researcher of the Consejo Superior de Investigaciones Científicas (CSIC), has put even a term to continue to monitor the behaviour of the different indicators which demonstrate that low El Hierro magmatic revival has not concluded. The volcanólogo estimated that at least during the next two years he should continue with the monitoring of the island; the first year, he warns "without lowering the guard'. Volcanic processes such as El Hierro, says Ortiz, extend much in the time 'human', although from the geological point of view, he says, this is "nothing".


Similar view is Nemesio Perez, who warns that, as regards the underwater eruption of La Restinga, is only in a posteruptiva phase 'that can last months or years' if it is taken into account, recalled, preeruptive stage began "according only to criteria of seismicity» in July 2011 and"mid-2010"if it serves to deformation and gas emissions. Therefore warns the also responsible for the Department of environment of the Institute and for renewable energies (ITER), «the posteruptiva phase can prolong a lot».


White, for its part, does not date to the termination of the monitoring in El Hierro, but yes it is clear that while parameters not again be at levels prior to July 2011 IGN will not lower guard.

[jand]

Maps of all earthquakes over the last ten days El Hierro.

http://www.01.ign.es/ign/resources/volcanologia/html/eventosHierro.html

[jand]

CarlosB says:

 March 8, 2012 at 12:35


I know it´s duplicate post...

Awesome last report from IEO with bathymetry and new datas inside... (multiple vents)

http://www.ieo.es/apartar/ieoprensa/hierro/hierro_leg11.pdf

Reply



CarlosB says:

 March 8, 2012 at 12:38


Results
 The main morphological differences found in this new survey conducted over the previous 15 days ago are:
 •
 A succession of cones between the primary and secondary cone comprising a ridge NNW-SSE direction coincident with the axis of Rift south of the island.
 •
 A slight increase in volume of deposits of the upper and especially in the cone that have brought this dimension to the 88m depth.
 From the point of view of volcanic activity observed in the column include a significant reduction in the presence of feathers of issue and the disappearance of noise in the echograms.

Cone
 In the new survey clearly shows the alignment of the different active emission points giving rise to a peak of 675 m long, which follows the direction SSE-ESF. Throughout this ridge depth increases in the direction 154 °
 The highest point of the volcano is located at 88 m depth, representing an increase of 32 m from the last bathymetry performed on days 7 and 8 February.
 The coordinates of the main summit remain: 27 ° 37.18 'N, 17 ° 59.58#8242; W
 The slope of the volcano slope varies between 26 and 33 degrees, with the largest outstanding at the side surfaces SW and lying to the SE.
 Fig 4: In the lower right corner of the volcanic edifice MDE (Aerial View). At the top right oblique view from the South Cone (The points are obtained with multibeam probes). On the left probes covered by the volume which cuts the top and is shown represented in yellow on both right side view of Fig.

Deposits
 Broadcast material deposits that extend along the canyon that houses the new volcano have not experienced any variation has been observed and only increase in volume at the peak of the volcano.

Emission Zone
 Only at the apex of the main cone and to a lesser extent at some point of the ridge, there has been alteration of the column emission plumes. It should be noted that feathers registered in this campaign until ascend vertical surface which suggests that they are less affected by advection phenomena. This could be explained by a faster rise of broadcast material that could be due to a decrease in the density of the material expelled.

[jand]

These comments are food for thought !!!


Carl le Strange says:

 March 8, 2012 at 13:42


It is a convoluted way of saying that the slope has a shallow angle now. It is for all point and purposes a shield volcano now. So the lava extruded do not run fast downslope, ie. it stays and cools at the top, building height quickly on the volcano.
 Also not in Carlos translation that they mention that the lava is of low weight and is fluid. Another way to say it, it is basic hot basalt. So it is less gassy, flow easily through a smooth tube.
 Another way to say it is that now Bob is pushing fresh deep magma since all of the old is cleared out. It explains that Bob is erupting very silently. So, we can no longer rely on CHIE or quakes to judge the activity. Only way to do that is via bathymetry and the 0,59 and 0,3 Hz tremor on EOSO and EGOM. And the last has picked up steadily since this latest bathymetry. Bob is going, do not believe anything else. And we will get the proof of that in 2 weeks when the next bathymetry comes along. But this bathymetry pretty much already proves that IGN was wrong.

Question, what will IGN say in about 2 weeks when the eruption starts to give surface explosions? It should do that as the height passes 50 meters really. And at the going rate of 36 meters per 14 days we will have a depth of 52 meters next time around.

Also, I have a good question. In the original eruptive reports the angle was steep for the slope of the volcano, so all calculations I have seen has been done on a steep angle cone, but where and when did all of this lava come from that transformed Bob from a stratovolcanic cone, to a shield volcano? Conclusion, the rate of materials ejected since january must have been much larger then reported. Nothing else is logical.

Reply





Aclaraciones:
 El equipo investigador embarcado a bordo del B/O Ramón Margalef durante esta nueva fase Bimbache Leg12, quiere dejar constancia al PEVOLCA que los resultados preliminares obtenidos muestran que las condiciones físico-químicas del agua siguen afectadas y de forma significativa por la acción del volcán submarino. Esta afección, ver mapa Figura 1, no se limita a las inmediaciones del volcán submarino, sino también en las estaciones más cercanas a la costa herreña, incluso en la realizada a tan sólo algunos metros de la entrada del puerto de La Restinga".

#8206;"Clarification: the research team embarked on Board of the Ramon Margalef B/O during this new phase Bimbache Leg12, would like to record to the PEVOLCA that the preliminary results show that the physico-chemical conditions of the water are still affected significantly by the action of the submarine volcano." "This condition, see map figure 1, is not confined to the vicinity of the submarine volcano, but also in nearby herreña coast-to-coast stations, even in performed just a few meters from the entrance of the port of La Restinga". (Translated by Bing

[jand]

So is... Another tip of the island in the dorsal heart NE towards valverde...(Henry)


1130977 08/03/2012 11: 02: 02 27.7802 - 17.9438 26 1.4 mbLg SW VALVERDE.IHI

[jand]

VolcanoCafe.






Life normally is filled with patterns. El Hierro has a pattern of its own, IGN declares the volcanic vent affectionately named Bob as dead, and a couple of days later the scientific crew of the ship Ramon Margalef publishes a report proving them wrong.

This time in addition to the bathymetric data we also got acidity values and electrical conductivity curves. The interesting thing with these is that they prove that during the measurement period there was a point source feeding acidic compounds into the water. The most likely culprits for the acidity are sulphuric acid and CO2. The values are still roughly the same as during the last measurements was taken, and this leads to the obvious conclusion that the vent is open and active. Also the electrical conductivity is pointing to an active source changing the conductivity.

The bathymetry gives at hand that the cone has now reached 88 meters from the surface. This gives that the growth rate during the last month has been 36 meters. At the going rate we should start to see surface disturbances in about two to four week as hydro magmatic explosions start.

Also noteworthy is that the shape of the volcanic main vent has changed from the stratovolcanic type with steep angle of slopes, to a shallower angled shield volcano type (26 to 33 degrees). One should though remember that a sub-aquatic volcano always has steeper angles compared to a sub-aerial one. This due to the water cooling the lava faster than the air does.


Image by IEO. Here we can see how shallow the angles of Bob have become during the last couple of months. The true angle is now between 26 and 33 degrees, normal angle for a sub-aquatic shield volcano constructed from unevolved basalts.



Another tidbit given is that the lava now is more fluid then before. This goes well with the less steep angles that we see now.  It all points towards that the first phase of eruption was containing large parts of reactivated rhyolitic material. This gave a high discoloring of the stain due to the high amount of ash content suspended in the water. Now the old rhyolitic mush is cleared out from the system, and the volcano is emitting predominantly unevolved basalt of deep origin.

This last part explains the low harmonic tremor since basalts travel easily in the conduits compared to the semi-solid rhyolitic mush, especially in a well worn feeder tube like the one leading to Bob. Another thing is that rhyolites are famously explosive and creates a lot of noise when erupting.

As I have now said time and again. Bob is not a volcano. The volcano is Tanganasoga, with the feeder system leading to Bob functioning as a pressure relief valve at the far end of the fissure swarm leading south from Tanganasoga. During the eruption there have been long periods of very low tremor associated with possible deep magmatic movement. This low frequency tremor is most easy to spot at the stations named EOSO and EGOM, and are found as clear red lines at the 0.59Hz and the 0.3Hz bands.

This gives that as the pressure has gotten into equilibrium the noisiness falls even more. Bob is now ejecting magma at the same rate as it is introduced into the system by the hotspot. With this in mind we can rule out any large changes in the eruption as long as the vents are open. And the eruption can be a very long one.

http://www.ieo.es/apartar/ieoprensa/hierro/hierro_leg11.pdf

http://www.ieo.es/apartar/ieoprensa/hierro/hierro_leg12.pdf

[jand]

OT another Volcano on alert.

4.1 earthquake comes as scientists watch Alaska's Iliamna volcano




 Ben Anderson | Mar 08, 2012



Enlarge This Image


Related




Earthquake jolts Southcentral Alaska


Alaska's biggest volcanic eruptions


On Wednesday, the Alaska Volcano Observatory issued an alert that they were closely monitoring Iliamna Volcano, 130 miles from Anchorage on the lower west side of Cook Inlet, following a period of increased seismic activity. That was before a moderate earthquake struck the upper Cook Inlet region in the wee hours of Thursday morning that many residents of Alaska's largest city may have woken up to.

"Over the past three months, there have been several episodes of increased earthquake activity at Iliamna Volcano," the AVO said. "One of these episodes is currently ongoing, and is characterized by numerous small earthquakes. This increase in earthquake activity may be related to movement of magma at depth, and additional observations including an airborne gas sampling and observation flight are being planned."

Despite the warning, the alert level for the 10,016-foot volcano remained at "Green," meaning that no eruptive activity or potential for imminent eruption was evident. Iliamna has no record of eruptions, though it has gone through similar periods of increased seismicity in the past. The AVO notes that an incident in 1996-97 was similar, though it didn't result in an eruption.

The alert was issued prior to a magnitude-4.1 earthquake Thursday morning that may have woken some Southcentral Alaska residents. It was located less than 40 miles from Kenai, Soldotna, and Anchorage.

 .




That earthquake was a fairly comfortable distance from Iliamna volcano -- about 100 miles -- but was the second earthquake in the past few days that set Southcentral Alaskans on edge.  A magnitude 3.6 temblor took place Monday under Prince William Sound and a mere 16 miles from the ski resort town of Girdwood.

Elsewhere in Alaska -- Mount Cleveland, an active volcano in the Aleutian Islands that has been on-again, off-again when it comes to volcanic activity -- showed some signs of life of its own when remote seismic sensors detected a short explosion in the vicinity of the volcano. Located on an uninhabited island, there is no real-time monitoring set up at Cleveland volcano, so researchers weren't able to immediately determine if there had been any ash emission resulting from the explosion.

It's been an active couple of months for Alaska volcanoes: Cleveland rumbled back to life on Jan. 31, continuing an ongoing flirtation with eruption continuing from last year. Another Aleutian volcano, Kanaga, briefly came alive in mid-February before being downgraded in the early part of March.

[jand]

NOTA 474 AVCAN - ACTIVIDAD SISMO-VOLCÁNICA - ISLA DEL HIERRO - 10 MARZO 2012-11:15h peninsular - La actividad sismo-volcánica continúa moderada, con sismicidad en la zona del Golfo y ayer en las laderas del julán. Continua viendose microsismicidad detectada pero no localizada en el espectrograma del sensor de CHIE. Continúa la señal de tremor volcánico en la zona eruptiva de la Restinga, que con unos valores muy bajos se puede dar casi por extingido, muy cerca de su nivel mínimo, pero que sigue ahi, eso si se mantiene, incluso aumenta algo desde la última nota informativa. Nuevos sismos 3. Magnitud entre 1.1 y 0.8. Profundidades a 8.4, 10.9 y 13.3km. Anteayer 3. Ayer 3. Hoy va 1. En total van 12520 sismos localizados en El Hierro por el IGN desde las 9:00h del día 19 de Julio de 2011 (Enrique).


Note 474 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 10 March 2012-11: 15 pm peninsular - earthquake and volcanic activity is continuing moderate Seismicity in the Gulf area and yesterday on the slopes of the julán. Continuous between microsismicidad detected but not located in the spectrogram of the sensor of CHIE. Continues the signal of volcanic tremor in the eruptive area of la Restinga, with very low values can give almost by extingido, very close to its minimum level, but still there, that if it stays, even increased somewhat since the last information note. New earthquakes 3. Magnitude between 1.1 and 0.8. Depths to 8.4, 10.9 and 13.3km. 3 The day before yesterday. Yesterday 3. Today is 1. In total van 12520 earthquakes located in El Hierro by IGN from 9: 00 a.m. of the day 19 July 2011 (Henry).


http://www.avcan.org/Mapas/AVCAN2914.jpg?d=1331374297

http://www.avcan.org/mapas/#8203;AVCAN2914.jpg?d=1331374297

[jand]

The 2.1 mg earthquake that happened earlier this afternoon has not yet been given a depth by IGN.


1131536 10/03/2012    15:06:54   27.6821   -18.0519   2.1   4    SW EL PINAR.IHI

[jand]

Pevolca have got it wrong there has been bubbling seen and a jaquzzi over the stain today Bob is still alive.

parece que se rie de nosotros jaajaj, vuelve el burbujeo...

seems to be rie of us jaajaj, returns the bubbling... (Translated by Bing)

4 minutes ago · Like · 2.

Ana I. Berra Romero A estas horas, eso no creo que sea un reflejo del sol, no creeis?
3 minutes ago · Like.

Nieves Garcia Perez tendra algo que ver con el ultimo sismo?

have something to do with the latest earthquake? (Translated

[jand]

http://www.youtube.com/watch?v=udf3MnWk-YE&feature=player_embedded

Video of tonights activity.

[jand]

Avcan on their FB page have also confirmed the erruption is still ongoing.

Copied and translated.

The eruption of the calm sea is under way against the decisions of PEVOLCA, IGN and authorities (Fernando)
See Translation
http://www.youtube.com/watch?v=sUadTaGXePQ&feature=share

The eruption of submarine volcano of the calm sea, on the island of El Hierro, continues its course despite the imprudent decisions of volcanologists and author...

[jand]

Avcan FB Comment.

Good afternoon. First must be clear that no one has been finished the eruptive process, but that what they gave terminated was the eruption; While there is deformation, earthquakes (although the number has decreased considerably in this month) the eruptive process continues, but there is no record that has erupted, so that bubbling might simply degassing. But it is true that given the low level of tremor, as well as the increase in the height of the volcano (remember that he went from 120 MTS. 88 without that supposedly had rash), we could be seeing a rash of effusive type that only could demonstrate by sending a submarine robot equipped with a camera that can record the volcano. What you don't understand, or at least I do not understand, is that if the eruption ended there by mid-February, and the volcano has grown, it has not given any explanation (do not think that this growth has been an inexplicable phenomenon product) or taken images which can end with this speculation. And if you have taken, theirs is to make public, as well as that also issued the measurements of CO2 by the INVOLCAN. Leave you can speculate is not conducive to the island, just the opposite because it can give contradictory information, so transparency in information, with the evidence to support such information is no longer necessary, it becomes indispensable. For this reason I ask are only two things: the immediate dispatch of a robot that record what happens in the volcano, and published measurements of the CO2. Thanks a lot. (Nino)

[jand]

OT Another active volcano.

ukviggen says:

 March 10, 2012 at 20:35


With Bezymianny still bubbling away, Sheveluch has decided to join the party.

Photos at:
 http://www.kscnet.ru/ivs/kvert/current/shv/index.html

Issued: 20120310/0132Z
 Volcano: Sheveluch (1000-27)
 Aviation Color Code: Orange
 Source: KVERT
 Notice number: 2012/14
 Volcano Location: 56.636N 161.315E
 Area: Kamchatka, Russia
 Summit Elevation (meters/feet): 2500 m/8202 ft
 Height of ash plume (feet/km) ASL and how determined: 16405 ft/5 km – Video
 Distance of ash plume from the volcano (mi/km): 15.54 mi/25 km
 Direction of ash plume or ash cloud drift from the volcano: North-East
 Start time of explosion and how determined: 20120310/0124Z – Video
 Time and method of observation: 20120310/0132Z – MTSAT
 Duration of eruption (or indicate eruption is continuing): eruption is continuing

Remarks:
 singles moderate ash explosions began to occur at the lava dome from 01:24 UTC on March 10, and continue. Strong explosions are possible.

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