Bij een vulkaan kan het altijd ieder moment raak zijn, moet wel de kamer gevuld zijn met magma natuurlijk, en dat herken je weer aan de inflatie die toeneemt. Aardbevingen zeggen niet zoveel, kijk maar hoeveel El Hierro er nodig had om te ontwaken, en dat ging in een paar maanden, katla is al een aantal jaar bezig;)quote:Op zaterdag 12 november 2011 11:57 schreef KazimirMalevich het volgende:
34 aardbevingen de afgelopen 48 uren, waarvan eentje boven de 3. Te weinig om te wijzen op nakende activiteit, maar anderzijds toch ook niet zo erg normaal? Iemand die dit kan kaderen?
Wijst dat op een soort "ontwaken" van de vulkaan, dus dat het binnen pakweg een jaar prijs kan zijn? Of is dit gewoon een periode van wat onrust zonder dat dit wijst op een nakende uitbarsting?
quote:During the night there was an small earthquake swarm in Bárðarbunga volcano. The largest earthquake in this earthquake swarm was ML3.04 in magnitude. It had the depth of 8.5 km. This might have been a n dike intrusion. But it is hard to know that for sure at the moment. This earthquake swarm only lasted for an about 2 to 3 hours before it stopped.
read more here
twitter:jonfr500 twitterde op woensdag 21-12-2011 om 21:24:41 There is an harmonic tremor activity visible on Skrokkalda SIL station. This seems to be from Hamarinn volcano. So far it is just tremor. reageer retweet
quote:3.6 quake strikes Krisuvik Volcano
At 21:12 UTC on 3. January 2012 an earthquake with the automatic size of ML3.6 did happen in Krísuvík volcano. I do not yet know if this earthquake was felt in the nearby area. But I assuming that it has done so.
This earthquake did appear clearly on my geophones. Both in north and south Iceland. They can be viewed here. I am going to update this blog post as I know more. But this seems to be an start of earthquake swarm in Krísuvík volcano.
Update 1: It has been confirmed that this earthquake was felt in Reykjavík and nearby area. The automatic depth of this earthquake was 14.2 km according to Iceland Met Office.
Update 2: Earthquake swarm has started in Krísuvík volcano. The largest earthquake in this earthquake swarm after the main earthquake is ML1.1 in size. Larger earthquakes however might happen at any time in this earthquake swarm. But that is at least the experience so far.
Update 3: Here are the traces of the earthquake. Sorry. But for the moment there are no high resolution pictures available as my main earthquake computer is offline until I move back to Denmark. See this blog post here for more details on that.
quote:Update on Grímsfjall volcano glacier flood
During the past several hours the amount of water in the glacier flood from Grímsfjall volcano has not dropped a lot, but this glacier flood started two days ago (27.01.2012 around 12:00 UTC). But that might be down to heavy rain in the area. Normally a glacier flood from Grímsvatn lake (inside the Grímsfjall volcano caldera) last for about one to two days during a normal glacier flood. It is believed that this glacier flood is from Grímsfjall volcano glacier lake. But it might be hard to confirm this during this time of the year.
Possible noise from the glacier flood on this SIL station. This might however be increased noise due to heavy rain on it. Copyright of this picture belongs to IMO.
I have known for some time now that Grímsfjall volcano is preparing for a new eruption. This I know because of the increase in earthquake activity and increased hydro thermal activity in Grímsfjall volcano. So far there is nothing that suggest that Grímsfjall volcano is going to erupt this time around, at least for the moment. I am expecting this glacier flood to be over in the next several hours. No earthquakes have happened in Grímsfjall volcano during this glacier flood. I do not expect them to take place unless magma starts moving inside Grímsfjall volcano. Be that dike intrusion or start of an eruption.
quote:Earthquake swarm at Katla
This morning there was an earthquake swarm in Katla volcano. This is the first earthquake swarm of the year 2012. This earthquake swarm is most likely created by an dike intrusion. Based on how dense the earthquake swarm appears to be. But that is often an sign of an dike intrusion in an volcano. How this earthquake swarm is going to evolve over the next few hours impossible to know for sure. That depends on what the magma is going to do that is creating this earthquake swarm.
The earthquake swarm in Katla volcano. It is dense as can be on this picture from Iceland Meteorological Office. Copyright of this picture belongs to Iceland Meteorological Office.
The earthquakes can be seen on my geophone web page here (English). The geophone at Skeiðflöt is going to go up this week. So all activity in Katla volcano is going to appear more clearly following that. Sadly. No high resolution of the earthquakes that take place is not going to be available until I move back to Denmark. As my main earthquake computer is offline and is going to be so until that time.
I am going to post updates to this if anything more happens.
quote:A seismic swarm has occurred on the Reykjanes Ridge 70 km offshore the SW tip of Iceland. About 40 earthquakes with magnitudes mostly between 2 and 3 were recorded. The Reykjanes Ridge is part of the active SW rift zone running through the western part of Iceland.
Possibly, the swarm marked a magma intrusion in this area.
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