Category: Swarm

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Magnitude 4,2 earthquake in Bárðarbunga volcano

Today (14-September-2018) at 10:40 UTC an magnitude 4,2 earthquake took place in Bárðarbunga volcano. Second largest earthquake in this swarm had a magnitude of 2,9. Other earthquakes that happened were smaller in magnitude.


Green star is the magnitude 4,2 earthquake in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity is normal for Bárðarbunga volcano as it continues to inflate after the eruption 2014 – 2015. At the moment the rate of this magnitude earthquake seems to be around 1 earthquake each month. It seems that rate of earthquakes is continuing to drop and soon it is going to be one to two earthquakes a year like this in Bárðarbunga volcano.

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Earthquake swarm on Reykjanes peninsula (Bláfjöll area) [updated]

Earthquake swarm started today (13-September-2018) in Bláfjöll area. This earthquake swarm continued today with only minor earthquakes. At 20:17 UTC an earthquake with magnitude 4,1 happened in Bláfjöll area. This earthquake was felt over a wide area.


Earthquake swarm in Bláfjöll area. Green star is the magnitude 4,1 earthquake. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm appears to be ongoing. There is a possibility that more earthquakes with magnitude above 3,0 might happen in next few hours to days.

Update 14-September-2018

Icelandic Met Office has updated the earthquakes in this area. Two earthquakes happened yesterday. One with magnitude 4,1 and one with magnitude 4,2. There are only few seconds between the earthquakes.


The new image of the earthquake activity in Bláfjöll area. Green stars are the two earthquakes that were felt. Copyright of this image belongs to Icelandic Met Office.

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Article updated on 14-September-2018 at 13:21 UTC.

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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 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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