Category: Swarm

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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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Minor earthquake swarm in Katla volcano

Today (1-August-2018) a minor earthquake swarm took place in Katla volcano. Largest earthquake in this swarm had a magnitude of 2,5. All other earthquakes are smaller in magnitude. It is unclear at the moment if this is connected to a possible glacier flood from Mýrdalsjökull glacier. Currently there are no news on this.


A minor earthquake swarm in Katla volcano. Copyright of this image belongs to Icelandic Met Office.

At the moment it appears that this earthquake swarm is over. But it might start again without much warning since that has often been the style of earthquake activity in Katla volcano.

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Minor earthquake swarm in Bárðarbunga volcano

Today (1-August-2018) at 07:08 UTC an earthquake with magnitude 3,7 happened in Bárðarbunga volcano. Second largest earthquake had a magnitude 2,9. Other earthquakes are smaller in magnitude.


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

The source of this earthquake activity is magma. In the news today it is reported that hydrothermal activity remains high in Bárðarbunga volcano caldera rim and steam can be observed in the areas were the glacier has been melted through.

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Earthquake swarm in Krýsuvík on Reykjanes peninsula

Today (31-July-2018) an earthquake swarm started in Krýsuvík volcano. Currently this earthquake swarm is ongoing. Largest earthquake so far has the magnitude of 3,1. Other earthquakes are smaller in magnitude.


Earthquake swarm in Krýsuvík volcano (green star). Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm looks tectonic in nature and nothing suggests that magma has anything to do with it. It is impossible to know how this earthquake swarm develops as the time passes.

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Small earthquake swarm in Öræfajökull volcano Monday 23-July-2018

On Monday 23-July-2018 there was an small earthquake swarm in Öræfajökull volcano. This type of earthquake swarm is a common activity at the moment. Around 100 to 200 earthquakes now happen in Öræfajökull volcano each week. Almost all of them are small and less than 1,0 in magnitude.


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

Largest earthquake so far this week had a magnitude of 1,2 and it had a depth of 4,9 km. Other earthquakes where smaller in magnitude. When a earthquake swarm happens in Öræfajökull volcano it is because magma is pressuring it self upwards inside the volcano. Earthquakes far outside Öræfajökull volcano are because of stress changes in the crust and that re-activates fault lines in the area. This might increase as more magma collects into Öræfajökull volcano along with stronger magnitude. That process might take weeks or months from what it is today.