Earthquake swarm east of Grímsey island (Tjörnes Fracture Zone)

During the night of 18-March-2019 an earthquake swarm started east of Grímsey island in a volcano called Nafir (no Global Volcanism Program profile). The only GVP profile that exists is about the volcano south of this one (GVP profile can be found here). The volcano in this area doesn’t have any documented eruption history in recent 10.000+ years. This might be wrong due to lack of research. In 2018 there was a strong earthquake swarm in this area. Articles connected to that earthquake swarm can be read here. Top of the earthquake activity on 19th of February 2018 looked like this as I wrote in a article last year. Current earthquake activity suggests a repeat of last year activity, only time is going to show if this does happen, but clues are strong in that direction. Earthquake activity in this area is complex and this is a rift valley it is taking place in.


The earthquake swarm east of Grímsey island in Tjörnes Fracture Zone. Copyright of this image belongs to Icelandic Met Office.

Largest earthquake so far has the magnitude of 3,3 and other earthquakes are smaller in magnitude. Currently around 55 earthquakes have been recorded. The earthquake swarm is ongoing even if current rate of earthquakes is low.

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This entry was posted in Earthquakes, Monitoring, Nafir-Skjálfandadjúp, Swarm, TFZ, Tjörnes Fracture Zone, Volcano. Bookmark the permalink.

2 Responses to Earthquake swarm east of Grímsey island (Tjörnes Fracture Zone)

  1. Kay Tina Cook says:

    This EQ burst seems to be sustaining its self. A 3.2 not so long ago.

    • It is going similar path as the earthquake swarm in February 2018. Seems stronger now than last year. That I find is odd since normally last year earthquake swarm released a lot of crustal stresses in the area.

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