Category: Swarm

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Earthquake swarm in Öræfajökull volcano

Today (8-December-2018) there has been a fresh earthquake activity in Öræfajökull volcano. This earthquake swarm was in the northern part of the caldera, or just outside it.


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

Largest earthquake in this swarm had a magnitude of 2,6. Other earthquakes had a magnitude of 0,2 to 0,8. This is normal for Öræfajökull volcano in its current phase.

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Earthquake activity in Þórðarhyrna volcano (Thordarhyrna)

During the night of 3-December-2018 earthquake activity started in Þórðarhyrna volcano (no GVP profile, under Grímsvötn volcano profile). Largest earthquake in this swarm had a magnitude of 2,1 and second largest earthquake had a magnitude of 2,0.


Þórðarhyrna volcano is located south-west of Grímsvötn volcano. Yellow dots on this image. Copyright of this image belongs to Icelandic Met Office.

Last eruption in Þórðarhyrna volcano was in the year 1902 December to 1904 12-January and was a VEI=4 eruption. An eruption happened in Grímsvötn volcano at the same time.

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Two earthquake swarms in Öræfajökull volcano

Today (1-December-2018) two earthquake swarm took place in Öræfajökull volcano.


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

Largest earthquakes in this two earthquake swarms had magnitude of 1,1. All other earthquakes are smaller in magnitude. What is unusual now is that there are two earthquake swarms happening in Öræfajökull volcano. In last few months only one area has been having earthquakes at time. It is worth keeping a eye out for this change if it holds.

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Earthquake activity in Hekla volcano (there is *no* eruption risk above normal levels!)

Over the last few days there has been swarm of small earthquakes in Hekla volcano. This earthquake activity is situated in the south part of the Hekla volcano system. It is just outside the main volcano. What is causing this earthquake activity is unclear.


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

There is no eruption risk from this earthquake activity. There is nothing suggesting that for now at least this is going to result in a eruption. A lot stronger earthquake activity is needed before that can be declared!

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Earthquake swarm on Reykjanes peninsula – Bláfjöll area

Today on 24-November-2018 a magnitude 3,3 earthquake took place in Bláfjöll area. Second largest earthquake in this swarm had a magnitude of 2,9. Other earthquakes have been smaller in magnitude.


Earthquake activity in Bláfjöll area. Copyright of this image belongs to Icelandic Met Office.

The larger earthquake was felt in Reykjavík area according to news reports. The earthquake swarm appears to be ongoing.

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Earthquake swarm in Tjörnes Fracture Zone south of Grímsey island

Since yesterday (10-November-2018) and today (11-November-2018) there has been a earthquake swarm in Tjörnes Fracture Zone (TFZ). Largest earthquake in this swarm had a magnitude of 3,0. All other earthquakes have been smaller in magnitude. At this moment around 130 earthquakes have been recorded in this earthquake swarm. There are no reports of earthquakes in this swarm being felt by nearby population areas.


The earthquake swarm south of Grímsey island. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm seems be ongoing, even if it has slowed down at them moment. It is a question if it is going to continue or stop in the next few hours to days.

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Earthquake activity in Grímsvötn volcano

During the night there was an earthquake swarm in Grímsvötn volcano. Largest earthquake in this swarm had a magnitude of 2,6 and other earthquakes were smaller in magnitude.


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

Yesterday (06-November-2018) there was also earthquake activity in Grímsvötn volcano but it was at lot smaller scale then what happened during the night. At the moment there are no signs that Grímsvötn volcano are about to erupt. There has not been any more earthquake activity today.

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Minor earthquake swarm in Tjörnes Fracture Zone

Today (6-November-2018) there has been a minor earthquake swarm in Tjörnes Fractures Zone (TFZ). Largest earthquakes in this swarm had a magnitude of 2,7 and 2,6. Other earthquakes that have happened so far have been smaller in magnitude.


Earthquake swarm in Tjörnes Fracture Zone. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm seems to be mostly over at the moment. There is a good change it might resume at later time, if it isn’t completely over now. New earthquake swarm might also start in this same area without warning. It is impossible to know for sure what happens next in Tjörnes Fracture Zone.

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Earthquake swarm in Krýsuvík

Today (28-October-2018) at 10:52 UTC an earthquake with magnitude of 3,0 took place in Krýsuvík volcano and since then there has been a minor earthquake swarm happening at that location. This earthquake swarm is not part of the volcano, this looks like a tectonic earthquake swarm due to rift zone activity in this area.


The earthquake swarm in Krýsuvík volcano. Copyright of this image belongs to Icelandic Met Office.

The strongest earthquake was felt in Hafnarfjörður, Reykjavík and other nearby towns. At the moment it is unclear if this earthquake swarm is just starting or if it has already ended. It is possible that more earthquakes are going to happen in this area without warning.

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Earthquake swarm north of Kolbeinsey island

Today (19-October-2018) a earthquake swarm took place north of Kolbeinsey island. Due to distance from the SIL network only the largest earthquakes are being recorded.


Earthquake swarm north of Kolbeinsey island (green star). Copyright of this image belongs to Icelandic Met Office.

Largest earthquake detected so far has a magnitude of 3,3 and the second largest has a magnitude of 3,0. Other earthquakes that are being detected are smaller in magnitude but all are over 2,5 in magnitude. The sensitivity of the SIL network isn’t good this far from the coastline. It is unclear if this earthquake swarm is ongoing or not.

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