Magnitude Mw4,9 earthquake east of Grímsey island (Tjörnes Fracture Zone)

During the night of 8-September-2022 at 04:01 UTC an earthquake with magnitude of Mw4,9 took place east of Grímsey island. According to news reports this earthquake did wake up people in Grímsey island and was felt over a wide area in north-eastern Iceland. Over 22 earthquakes with magnitude above Mw3,0 have taken place since this earthquake swarm started. Over 700 earthquakes have been recorded at the writing of this article. This earthquake swarm is ongoing and number of earthquakes and possible stronger earthquakes might happen after this article is published.

A lot of green stars showing earthquakes over magnitude 3,0 east of Grímsey island and more red and orange dots showing smaller earthquakes. The map is brown for land mass and blue for ocean area, were the earthquake swarm is taking place
Earthquake activity east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.

Earthquake swarms like this are common in this part of Tjörnes Fracture Zone and happen every 2 to 3 years, it is longer between large earthquakes in the magnitude range of 6,0 to 7,0, but they do happen. This area has an volcano, but there are no signs that is currently active and remains dormant.


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