[breaking] Vulkaanuitbarsting bij Canarische Eilanden #2

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The seabed south of El Hierro, before and after the new volcano eruption

The team of the Spanish Institute of Oceanography (IEO, public research body under the Ministry of Science and Innovation), which develops from the Oct. 23 on a scientific mission on board Iron Ramon Margalef, has been compared in images before and after the appearance of the underwater volcano in the south of the Canary Island.

Comparing the 1998 image, taken from the Oceanographic Research vessel Hesperides, with this week by the Ramon Margalef, current studies allow us to interpret the submarine valley as the trace of a fault or fissure, at the end of which it is produced rash and creation of the new volcano.

Moreover, scientists have obtained the first video recreation of the crater of a volcano. The volcano has a base diameter of 700 meters, a height of 100 meters and a crater about 120 meters wide. The base of the crater is located 300 meters deep.


The image shows a topography module compiled from data obtained in 1998 with the Oceanographic Research Vessel Hesperides in the area of El Hierro, in the Program "Spanish Exclusive Economic Zone" that led the Navy Hydrographic Institute (MMI) Defense Ministry and the Spanish Institute of Oceanography (IEO) under the Ministry of Science and Innovation. This image reveals how much was raised from the seabed before the onset of the new volcano, the circle indicates the bottom topography at the time, which corresponded to an underwater valley.


This second image was captured on board the research vessel of the IEO Ramon Margalef. It clearly shows the volcano of new creation, and the morphology of a tongue of lava, rising from the crater, runs downhill along the course of the old valley.

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El Hierro volcano enters Surtsey eruption phase
Posted on November 6, 2011 by Jón Frímann
This is a short blog post about latest events.
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Earlier tonight a Surtey eruption started in El Hierro volcano. Before this phase did start there has been increased harmonic tremor on seismometers that are located on El Hierro Island. Volcano ash is to be expected while water can still get into the crater. When the water does no longer get into the crater it is going to stop making volcano ash. The ash plume can go up to 3 to 10 km high, depending on the strength of the eruption. New vents have also been opening up south of town of La Restinga. That means the fissure is still growing, at least that was the case yesterday and earlier today from what I can gather. I am unsure of that has continued or stopped.

Earthquake activity still high north west of the town of Frontera. This suggests that fissure might open up there. But so far that has not happened. I do not think this are earthquakes due to tectonic stress changes due to the eruptions in south El Hierro volcano. But this stress changes are because of the magma injections at depth in El Hierro volcano.

Harmonic tremor from the eruption in El Hierr volcano. It now shows clear signs of explosions (strong ones) and increased eruption activity. Copyright of this picture belongs to Instituto Geográfico Nacional.

If new vents open up closer to the shore there is going to be instant Surtsey eruption activity. But that might only last for a short while the water gets into the crater. There the lava stage is reached much sooner then on the vents that are erupting on more depth at the moment.

I am going to post more updates on this. If I can get more details on what is going on.

Sources:

Renewed Eruptions at El Hierro in the Canary Islands (Eruption blogs)

El Hierro 6 November 2011

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Important Update 07/11 09:58 UTC :
Raymond Matabosch latest report just in from his (safe) viewpoint.
Analyzing the current situation, there is no doubt that the submarine eruption is very active again. I am still convinced that a collapse of the top part of the new cone occurred yesterday morning (Sunday). The eruptive area colors brown and shows a large accumulation of pumice.
The jacuzzi is showing more activity and the bubbles are getting more important with steam jets on the surface of the water.
The buildup of the new top of the cone may explain the shaking of the ground due to underwater explosions It would not surprise me that the eruption spot will show plumes of steam and ash blowouts in the coming hours


Update 07/11 09:28 UTC :
- Reader Marco Schaapherder just told us that we might not have seen a shift in earthquake depth since midnight. He was right! Magma may have found his way up a few more km, as the focal depths are getting up to 14 km now.
Important Update 07/11 08:52 UTC :
Raymond Matabosch just reported that he had earthquakes all night in his current position at the Las Calmas sea. Raymond is thinking that the earthquakes he is feeling are rather submarine explosions and NOT the regular earthquakes we can see on the seismograph.

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The tremor has changed, has since shortly before 11:00 am much more volatile, with sharp rises and falls like a few days ago, and saturate the especrograma explosions, it may be again by pulses, which can raise the water several meters and the other day ... (Enrique)
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In the graph of the evolution of the mean depth of 6h of seismic energy released can be seen the evolution of volcanic seismic first swarm in the las calmas and the time when the eruption began, with several earthquakes superficial. After the seismicity was scattered and then from October 22 earthquake swarm began the second-volcanic area of el golfo.

This second volcanic seismic swarm was more or less stable in terms of depth, but in recent days, more or less from the first of the month, tends to rise, starting from the 21-23km where he began to 19-20 in the which is now, with increases to the wild area between 16 and 17 km and anomalous data up to 11km and that corresponds to the shallower earthquake of 3.6 occurred in the area of pine forest which is not representative of the graph.

In summary, the graph indicates that the volcanic system beneath the Gulf Valley area progressing to the surface (Enrique).

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The volcano fires a "big rock"

By midmorning on Monday has revived the eruption in El Hierro with a bubble of gas and ash on the surface of the sea of ​​calm, although smaller than that of Saturday.

Witnesses describe it made ​​a "huge stone"-a pyroclastic-that was thrown. The Civil Guard urgently evacuated neighbors who had come to La Restinga to collect belongings.

Canarian Government sources point out that the Civil Guard was limited to accelerate the exit evaqued residents are housed in the residence of Valverde and at that time were in town.

It (la Restinga) has been banned from the neighbors come to town to pick up belongings at home, but they are very pcoos those who make use of this possibility during Monday.

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07/11/2011 @ 12:49 Residents of La Restinga have been urgently evacuated after the bubbling and steaming effect increases in intensity and what was described by residents as a huge rock or stone was expelled from the epicentre.

07/11/2011 @ 12:24 After a day of little activity yesterday (Sunday), the underwater volcano eruption has today started to spew out lava and steam off the coast of La Restinga.

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El Hierro Eruption: Quite the Jacuzzi

We saw a lot of steaming, bubbling and even some small explosive activity at El Hierro over the weekend not much has changed since Saturday, but I wanted to share this great set of image. On the left is the bubbling ocean south of El Hierro amusingly termed jacuzzis by many readers. On the right is a thermal image of the jacuzzi showing just how warm the ocean water has become due to the eruption with is likely sources at least 50-100 meters below the ocean surface

Check bron voor verdere verhaal en verklaring van de hotspot/yacuzzi

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Update 08/11 08:32 UTC :
IGN and Graphics rescaling
- When discussing the activity with Raymond during the night, he hard a hard time believing that the harmonic tremor decreased seriously (see update 07/11 23:59).
- He did not detect any serious change while i reported this (of course it was dark and he was reflecting the explosion vibrations he felt)
- I was unable to confirm him that it was a real decrease because the graphics we use are coming from the IGN website and IGN NEVER REPORTS RESCALING the graph. Most of the time it can be seen by white spaces or blue lines in the seismograms and harmonic tremor graphs, but at the time of reporting no visible change was detected. Since midnight it is obvious that the scale was adapted a number of times. We request @ IGN that they will indicate the rescaling actions in a separate log.

Update 08/11 08:35 UTC :
Just in from Joke Volta : much stronger jacuzzi action this morning

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Transit of seismicity per day. It can be seen below on the left under El Golfo, the current seismicity depth and power (green and violet) that the first injection of magma that produced the current eruption (mostly red). This makes me think that it is an injection of magma different from the first.

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El Hierro `Stain now covers 34 hectares


The Ramon Margaleff Oceanographic research vessel has returned to the area surrounding the underwater volcanic eruption off the coast of La Restinga, El Hierro. Scientists on board are believed to be analysing the composition of the gases and mapping the seabed around the vents to assess the current state of the eruption.


Back on the Island, the National Geographic Institute (IGN) monitored a total of 15 earthquakes overnight, measuring between 1.5 and 2.8 magnitude on the scale Richter.

The largest of the earthquakes was recorded at the opposite, Northern side of the Island, at 04.58 hours and had a magnitude of 2.8 degrees, in the northwest of the town of Frontera and at a depth of 20km.
The other earthquakes occurred to the northwest of Frontera, between 10 and 24 kilometers deep, with the most recent occurring at a magnitude of 1.9 magnitude and at a depth of 07.43 hours and at a depth of 17 km.

Meanwhile, the `Deimos-1Spanish research satellite observing the Island has recorded that the eruptive stain now has an approximate diameter of 650 mts and covers an area of 34 hectares (0.34 million square meters).

Marys recent Youtube post gives a thorough review of yesterdays activity (bearing in mind she is working in EST as opposed to GMT) >>>

(Canary Islands) El Hierro Eruptions Now 100 Meters High! CO2 and Harmonic Rising 11/08/ 2011

Yesterday a total of 65 earthquakes were recorded between, the strongest being measured at 06.19 at 3.0 on the richter scale off the coast of Frontera and at a depth of 21km.