Update 3 on Tjörnes Fracture Zone earthquake swarm

Today (21-January-2016) the earthquake swarm on Tjörnes Fracture Zone continued after a little stop. This time it was the earthquake swarm on the south end (next to Kópasker village) that started to increase. The change happened around 02:30 UTC this morning and in the beginning a magnitude 3,1 and 3,6 earthquake took place. Total of three earthquakes took place with magnitude 3,0 or larger. The earthquake swarm was most active until around 06:00 UTC when it started to slow down. The earthquake swarm continues at this moment, but it appears to be slowing down. The largest earthquake was felt in Kópasker.

The earthquake swarm on the south end of Tjörnes Fracture Zone. Copyright of this image belongs to Iceland Met Office.

Earthquake swarms in this area of TFZ are common and often there are several taking place over the year. I expect this earthquake swarm to continue for next few days. The risk of more magnitude 3,0 or stronger remains high. It is also a question if this activity starts earthquake swarm on nearby faults on TFZ. This activity is not connected to any volcano, this only tectonic earthquakes due to stress related changes (continental drift) in the area.

If any new development happens. I’m going to update this article.


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I’ve been doing few changes to this website. It’s now possible to see latest comments posted. That can be found above the calendar. Now it’s also possible to go directly to my webicorder (geophones) website if anything happens when it comes to earthquakes.