Category: Earthquakes

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Strong earthquake swarm 88 – 90 km north of Kolbeinsey Island yesterday (8-September-2018)

Yesterday (8-September-2018) there was a strong earthquake swarm 88 to 90 km north of Kolbeinsey Island. Due to distance from the SIL network it is impossible to know how large and strong this earthquake swarm actually was. Largest earthquake reported by Icelandic Met Office had a magnitude of 3,3. Total of ten earthquakes with magnitude 3,0 or larger happened during this earthquake swarm.


Earthquake activity north of Kolbeinsey Island (green stars). Copyright of this image belongs to Icelandic Met Office.

Total around 30 earthquakes were detected but it can be assumed that total number of earthquakes might have been higher. At the distance from the SIL network smaller earthquakes are not detected. It is not possible to know for sure what is happening at this location due to distance from the coast and the SIL network.

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Fresh minor earthquake swarm in Öræfajökull volcano

Yesterday (23-August-2018) an fresh earthquake swarm started in Öræfajökull volcano. This earthquake swarm seems to be progressing in the same way as earlier earthquake swarms. Earthquake activity in Öræfajökull volcano only happens when magma is on the move inside the volcano.


Earthquake activity in Öræfajökull volcano. Copyright of this image belongs to Icelandic Met Office.

Largest earthquake in this swarm had a magnitude of 2,2 and the second largest earthquake had a magnitude of 1,9. Other earthquake activity has been as before and is mostly made of earthquake with magnitude 0,0 and up to magnitude 1,0. The magma in Öræfajökull volcano is slow moving and that is reflected in current earthquake activity.

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Earthquake swarm in Torfajökull volcano

Today (16-August-2018) at 15:53 UTC an earthquake swarm started in Torfajökull volcano. Largest earthquakes in this earthquake swarm had an magnitude of 3,8 and 3,3 at the moment other earthquakes that have happened are smaller in magnitude.


Earthquake activity in Torfajökull volcano. Largest earthquakes are marked by green stars. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm seems to be ongoing at the moment. It is possible that more earthquakes that might be felt are going to happen. The largest earthquakes in this swarm were felt in nearby tourist areas.

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Earthquake in Bárðarbunga volcano

Today (16-August-2018) a magnitude 3,5 earthquake took place in Bárðarbunga volcano. At the moment this is just a single earthquake with no aftershocks.


Earthquake activity in Bárðarbunga (green star). Copyright of this image belongs to Icelandic Met Office.

It is possible that this is all the earthquake activity that is going to happen in Bárðarbunga volcano for the next few hours to days.

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Earthquake swarm on Reykjanes peninsula (close to Hengill volcano)

Today (11-August-2018) there has been a earthquake swarm on the Reykjanes Peninsula close to Hengill volcano (but not in that volcano system). This earthquake swarm is currently ongoing and largest earthquake so far has had a magnitude of 2,6.


The earthquake swarm (red dots) on Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.

It is impossible to know how this is going to develop in this earthquake swarm. Stronger earthquakes might happen but it is impossible to know if they are going to happen.

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Earthquake swarm in south part of Katla volcano caldera

Today (9-August-2018) an earthquake activity increased in south part of Katla volcano caldera. It doesn’t appear that any earthquake in this swarm reached magnitude 2,0.


Earthquake activity in south part (towards the coastline) of the caldera of Katla volcano. Copyright of this image belongs to Icelandic Met Office.

It is unclear why this earthquake activity is happening at the moment. There isn’t anything unusual on harmonic tremor plots at the moment and nothing suggesting that an eruption is going to happen any time soon.

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More earthquake activity in Katla volcano

Today (8-August-2018) at 21:39 UTC an earthquake with magnitude of 3,1 took place in Katla volcano. Second largest earthquake in this activity so far had a magnitude of 2,4. This earthquake activity appears to be ongoing and magnitudes and number of earthquakes is going to change.


Earthquake activity in Katla volcano. Green star is the magnitude 3,1 earthquake. Copyright of this image belongs to Icelandic Met Office.

There is no change in harmonic tremor at the moment and that for now rules out any movement of magma inside Katla volcano. This might be connected to glacier floods that are now coming from Mýrdalsjökull glacier.

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Minor earthquake swarm in Katla volcano, ongoing glacier flood from Mýrdalsjökull glacier

Today (7-august-2018) a minor earthquake swarm took place in Katla volcano. Largest earthquake in this swarm had a magnitude of 2,9 and other earthquakes where smaller in magnitude.


Earthquake activity in Katla volcano. Copyright of this image belongs to Icelandic Met Office.

There is also a glacier flood coming from Mýrdalsjökull glacier. This has resulted in dangerous levels of Hydrogen sulfide gases close to Múlakvísl glacier river and the police has asked people not to stop in the area due to a risk of gas build up. The Hydrogen sulfide is at lethal levels in some areas where wind cannot move it.

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Considerable earthquake swarm in Katla volcano

Since early this morning (2-August-2018) there has been considerable earthquake swarm activity in Katla volcano. This earthquake swarm started yesterday (1-August-2018) at low rate but during the night and after a minor stop the earthquake rate increased and at the moment this earthquake swarm can be considered ongoing.


Green star is the magnitude 3,6 earthquake in Katla volcano. Copyright of this image belongs to Icelandic Met Office.

Largest earthquake so far had a magnitude of 3,7 and the second largest magnitude has been 2,2. Other earthquakes are smaller in magnitude at the moment. No change in harmonic tremor has been observed at the moment. There is a lot suggesting that glacier water from hydrothermal areas under Mýrdalsjökull glacier are now flooding into Múlakvísl glacier river. I got a report of that over facebook yesterday, but nothing has been confirmed officially at the moment.

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Slight increase in earthquake activity in Öræfajökull volcano

Today (1-August-2018) there seems to be a minor increase in earthquake activity in Öræfajökull volcano. What has also happened is that magnitude of earthquakes today has been slightly larger then in a normal week. Few magnitude 1,0 and larger and at least one magnitude 1,5 earthquake have happened so far.


Earthquake activity in Öræfajökull volcano (right corner, to the ocean). Copyright of this image belongs to Icelandic Met Office.

Current rate of earthquakes have dropped down to 50 earthquakes a week from earlier 100 earthquakes a week. This change might be normal for Öræfajökull volcano since this magma intrusion seems to be moving slowly inside the volcano. Regular earthquake activity continues to happen and there is no sign that is changing at the moment.

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