Earthquake swarm in Krýsuvík volcano (currently erupting in Fagradalsfjall mountain)

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Yesterday (24-April-2021) an earthquake swarm took place in Krýsuvík volcano close to Kleifarvatn lake. The largest earthquake had a magnitude of Mw3,1 and the second largest earthquake had a magnitude of Mw3,0. Both earthquakes where felt in Reykjavík area and other nearby areas. This activity is closer to Reykjavík then earlier earthquake swarms.

Earthquake activity close to Kleifarvatn lake east of the eruption in Fagradalsfjall mountain
The earthquake swarm close to Kleifarvatn lake. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity is not connected to the eruption in Fagradalsfjall mountain. That however doesn’t rule out that magma might be the reason why this earthquake activity is happening. Currently the earthquake activity is too low for this to be a start of a second eruption. It is impossible to know if this is going to develop into anything more serious at the writing of this article. There needs to be a lot more earthquake activity in this location before an eruption starts, even if an eruption might not start with a lot of earthquake activity as was seen when the eruption in Fagradalsfjall mountain started. This is based on assumptions that might be wrong but only time is going to show what happens in this area.

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One Reply to “Earthquake swarm in Krýsuvík volcano (currently erupting in Fagradalsfjall mountain)”

  1. Thanks for your article. I was especially interested to read your opinion that the location of the larger quakes was too far from the existing eruption to be directly caused by it. I had wondered about that, but hadn’t found anything on it until you wrote.

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