Month: March 2025

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Deep earthquakes in Eyjafjallajökull volcano

During the last few weeks there has been slow increase in deep earthquakes in Eyjafjallajökull volcano. This is unusual because it erupted in the year 2010 and in general only erupts every 290 to 700 years, based on current data into the eruption history of Eyjafjallajökull volcano.

Two dots in Eyjafjallajökull volcano. One blue, as its an earthquake from last 48 hours and one red since that's an earthquake from today (31. March 2025).
Earthquake activity in Eyjafjallajökull volcano. Copyright of this image belongs to Icelandic Met Office.

Depth of the earthquakes that have so far happened is around 24 to 26 km of those have been reviewed by Icelandic Met Office. Before the eruption in Eyjafjallajökull volcano in the year 2010 it took around 10 years from start of deep earthquakes until an eruption took place. This might just be deep earthquake activity that might not result in a eruption in next few decades. At the moment this earthquake activity is too small and too few earthquakes to know for sure what is going on.

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Earthquake in Krýsuvík-Trölladyngja volcano east of Keilir mountain

Today (26-Mars 2025) at 15:06 UTC an earthquake with magnitude of Mw3,2 took place in Krýsuvík-Trölladyngja volcano, just east of Keilir mountain. There has not been a lot of aftershock activity following this earthquake.

Green star just north of lake Kleifarvatn and east of mount Keilir. The map has a lot of smaller dots showing earthquake activity in other areas of Reykjanes peninsula.
The earthquake activity on Reykjanes peninsula. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity is possibly because of inflation in Svartsengi volcano. Since that results in stress changes along the Reykjanes peninsula, but mostly in the area closest to it. More earthquake activity can happen without warning in this part of Reykjanes peninsula.

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Earthquake swarm in Reykjanes volcano

Today (12-March 2025) at 14:29 UTC an earthquake swarm started in Reykjanes volcano. The largest earthquake had a magnitude of Mw3,8. At the writing of this article. This earthquake swarm seems to be ongoing.

Red dots and green stars on Reykjanes peninsula at the edge where it goes out into the ocean. Dots all over Reykjanes showing other earthquake activity.
Earthquake swarm on Reykjanes peninsula in Reykjanes volcano. Copyright of this image belongs to Icelandic Met Office.

This doesn’t look like an magma related earthquake swarm. This seems to be a fracture earthquake and might be connected to stress changes in the crust because of the high inflation in Svartsengi volcano, that is not far away from this location. The earthquake swarm is at a low now, but might increase again with stronger earthquakes without warning. If needed, I’ll post an update on what is happening.