Author: Jón Frímann

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Katla volcano earthquake activity update

This is not going to be a too long update about the activity in Katla volcano. Since I fear that this article might become outdated rather quickly.

Currently there is no eruption in Katla volcano. At the moment only earthquake activity has happened. Latest information shows that hydrothermal water has entered Múlakvísl glacier river from Mýrdalsjökull glacier and that is making the air nearby possibly toxic and dangerous. The two largest earthquakes had the magnitude of 4,5. One earthquake had the depth of 3,8 km while the one that happened 20 seconds later had the depth of 0,1 km. Other earthquakes had magnitude around 3,0 and above and below.

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Green star show where earthquakes with magnitude above 3,0 took place in Katla volcano. Copyright of this image belongs to Iceland Met Office.

It is not know how and eruption starts in Katla volcano, since no historical recordings exist when last eruption took place in the year 1918. Making ideas on how an eruption in Katla volcano start mostly guesswork. Current earthquake activity is the strongest since 1977, in 1955 there was some strong earthquake activity but magnitude of those earthquakes is not known. It is my idea that Katla volcano erupts when a rift zone activity takes place in this area, since it is on the eastern volcano zone (EVZ) in Iceland, it is currently expanding south of Vestmanneyjar and American plate and Euroasian plate is around 1cm/year.

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The main 4,5 earthquake in Katla volcano. This image clearly shows a long period earthquake. This is my station in Heklubyggð. This image is under CC Licence, please see CC Licence page for more details.

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The main 4,5 earthquake as it appeared on my geophone in Böðvarshólar. The earthquake signal is clear. This image is under CC Licence, please see CC Licence page for more details.

It is difficult to know what happens now. The signs are not good, but Katla is an active volcano with regular eruption cycles so this is only matter of time now. As mentioned above, the reason is lack of data on how the eruption process starts in Katla volcano. All that can be done now is to wait and see what happens next.

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Earthquake activity in Katla volcano

This article is going to be updated in the next 24 hours if needed. Details are few at this moment.

A magnitude 3,6 earthquake (automatic magnitude estimate) has happened in Katla volcano. Few other earthquakes happened before the largest earthquake and few minor earthquakes took place after it. At the moment activity has dropped down (as it appears on my geophone) to nothing. That might change without warning.

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Earthquake activity in Katla volcano. This image does not have the magnitude 3,6 (automatic magnitude estimate) in it. Copyright of this image belongs to Iceland Met Office.

At the moment no harmonic tremor has appeared on the SIL stations around Katla volcano. This means that eruption has not started. Until an harmonic tremor appears, this is just an earthquake activity.

This article is going to be updated if needed in few hours (around 16:00 GMT/UTC due to my current day plan).

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Minor earthquake swarm on Tjörnes Fracture Zone (TFZ)

Today (26-August-2016) a minor earthquake swarm started on TFZ. This is currently not a large earthquake swarm and only around 50 earthquakes have happened so far. More earthquakes might happen if this earthquake swarm continues.

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The minor earthquake swarm is shown by the cluster of red dots. Copyright of this image belongs to Iceland Met Office.

This area has seen several earthquake swarm since July and is a high chance earthquake activity is going to continue in this area for the next few days to weeks. Earthquakes with magnitude above 3,0 cannot be ruled out.

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Small glacier flood from Grímsfjall caldera lake

On the 18th of August 2016 a small glacier flood started from the Grímsfjall volcano caldera lake. This is a tiny glacier flood according to the news, with the glacier on top of the lake only having dropped around 5 meters so far.

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Minor glacier flood as it appears on Grímsfjall volcano SIL station. Copyright of this image belongs to Iceland Met Office.

This glacier flood is going into Gígjukvísl glacier river, at the moment Iceland Met Office doesn’t think there is any major danger from this glacier flood. The biggest risk at the moment is from volcano gases that have dissolved into the water and get released when the pressure drops of the water. The glacier water is already in Gígukvísl glacier river, no major changes are expected in that river due to how small this glacier flood is.

Iceland News

Lítið jökulhlaup hafið úr Grímsvötnum (Rúv.is, Icelandic)
Jök­ul­hlaup hafið úr Grím­svötn­um (mbl.is, Icelandic)

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Earthquake activity in Katla volcano

Today (19-August-2016) a magnitude 3,5 earthquake took place in Katla volcano. It was followed by several earthquakes, both before the strongest earthquakes and after it.

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The earthquake activity in Katla volcano. The green star shows the location of the magnitude 3,5 earthquake. Copyright of this image belongs to Iceland Met Office.

This doesn’t seems to be an activity connected directly to magma movements. This might however be a gas under pressure breaking rock, since clues this summer suggests that heat is now increasing in the caldera. At least for now, it might cool down again in coming months. The most common months for Katla volcano to erupt are from July until November, eruptions in other months are less common, they do happen every few hundred years.

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The magnitude 3,5 earthquake as it appeared on my geophone in Heklubyggð. This image is under Creative Commons licence. Please see the CC Licence page (above) for more details.

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Thanks for the patience and understanding

I want to thank my readers for the patience and the understanding of the quiet period following the sudden passing of my step-father on 11th of July 2016. This past month has been difficult for me and my family and the recovery process is far from complete, but I’m doing my best to live with the new reality with my step-father.

Life is never going to be the same for me, this is however just how the world works and I’ll have to live with it.

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Announcement: No new articles until at least 29th July

Due to the sudden passing of my step father on 11th of July there are not going to be any new updates until at least 29th July, possibly not until 16th of August. I just don’t know yet. I am going to Iceland for the funeral and other things that follow this whole thing.

I’m going to set-up a automatic posts for people can continue comment if something happens (they won’t appear on Facebook or Twitter). If comment get stuck in moderation or go to spam. I’ll do my best to free those comment once I see them. Internet connection is not good at my mother place so I don’t know how that goes once I’m there and my laptop is in really bad shape.

Automatic articles are going to appear on this days. They are going to be marked as such.

14th July
29th July
12th August