Yesterday (12-October-2022) an earthquake swarm started south and east of Grímsey island. This is in the same area as an earthquake swarm took place few weeks ago. Largest earthquakes so far in this swarm had a magnitude of Mw3,5. Larger earthquakes remain a possibility. Largest earthquakes have been felt in nearby populated areas.
Earthquake activity south of Grímsey island. Copyright of this image belongs to Icelandic Met Office.
This area has frequent earthquakes. This earthquake swarm might grow as sometimes happens. It might also equally just stop, since that is also something that earthquake swarm in this area do.
This is a short update on the earthquake swarm that is ongoing east of Grímsey island.
The earthquake swarm that started on 8-September-2022 east of Grímsey island is ongoing. Over 6000 earthquakes have been recorded at the writing of this article. Largest earthquakes in recent days have had a magnitude Mw4,2 and have been felt over a wide area. People living in Grímsey island and tourists in Grímsey island feel this earthquake swarm clearly.
Earthquake activity in Tjörnes Fracture Zone. Copyright of this image belongs to Icelandic Met Office.
There are no signs of an eruption is about to start. That might change without warning, but I don’t know likely an eruption is in this location because there’s no good data on possibility of an eruption. There’s also no clear reading from any nearby GPS station. This most likely is just an earthquake swarm. The risk of a magnitude 6 to 7 earthquake in this area remains high and such earthquakes can happen without warning.
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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.
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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Yesterday (27-June-2022) an earthquake swarm started in Tjörnes Fracture Zone in a area north-west of an place called Gjögurtá. Largest earthquakes where felt in Siglufjörður. The largest earthquake had a magnitude of Mw3,2.
Earthquake activity in Tjörnes Fracture Zone. Copyright of this image belongs to Icelandic Met Office.
In June 2020 this area had a large earthquake swarm with earthquakes that had a magnitude of Mw5,8. This might be an aftershock of that activity. I am not clear if that is the case, but it is a possibility.
During the night of 10-May-2022 an earthquake swarm took place in Tjörnes Fracture Zone (TFZ). Largest earthquake in this swarm had a magnitude of Mw3,2 and based on distance from the coast it is unlikely that this earthquake was felt.
Earthquake activity east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.
This earthquake activity is normal for this part of Tjörnes Fracture Zone. It is not possible to know what is going to happen next in this activity if anything and it might just stop.
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During the night of 29-January-2022 an earthquake swarm started south of Grímsey island. This earthquake swarm is rather strong at the writing of this article.
Yesterday (28-October-2021) an earthquake swarm took place east of Grímsey island. The largest earthquake had a magnitude of Mw3,9 at 22:06 UTC. It is not know if it was felt in Grímsey island.
Earthquake activity east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.
Earthquakes are common in this area and large earthquake swarm happens in this location every 2 to 10 years.
Yesterday (30-August-2021) an small earthquake swarm took place east of Grímsey island in Tjörnes Fracture Zone. Two largest earthquakes had a magnitude of Mw3,2.
Earthquakes east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.
This earthquake swarm seems to have stopped for now. This area has frequent earthquake swarms and activity in this area of Tjörnes Fracture Zone might start again without warning.
During the night of 5-August-2021 an earthquake swarm took place in Tjörnes Fracture Zone (TFZ). At the writing of this article this earthquake swarm is ongoing.
Earthquake activity south-east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.
Largest earthquake in this swarm had a magnitude of Mw3,0. Other earthquakes where smaller in magnitude. No earthquake has been felt in Grímsey island.
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Yesterday (1-April-2021) an earthquake swarm took place east of Grímsey island. The largest earthquakes in this swarm had a magnitude of Mw3,8 and Mw3,6 and where possibly felt even if that was not reported. Total of 142 earthquakes have taken place when this article is written.
Earthquake activity east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.
Earthquake activity is very common in this part of the Tjörnes Fracture Zone and it is now just around one year since a large earthquake swarm took place far west of Grímsey island in June 2020. It is difficult to know of more earthquake activity is going to happen at this location in next few days.
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