Today (9. December 2023) an earthquake swarm took place east of Grímsey island, it started at 11:09 UTC and ended around 12:19 UTC. This was a small earthquake swarm and largest earthquake had a magnitude of Mw3,0.
This area of Tjörnes Fracture Zone has frequent earthquakes and earthquake swarm activity. Large earthquake swarms happen in this area every few years. Time between them is different. If that is the case now is impossible to know.