Earthquake activity east of Grímsey island

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. Largest earthquake shown by a green star.
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.

Minor earthquake swarm in Tjörnes Fracture Zone yesterday (30-August-2021)

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.

Earthquake swarm east of Grímsey island. Two green stars on top of each other.
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.

Earthquake swarm in Tjörnes Fracture Zone

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.

Few red dots show new earthquakes just south-east of Grimsey island
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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Earthquake swarm east of Grímsey island on 1-April-2021

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. Two green starts on top of each other show the location of the earthquakes with magnitude above 3. Large amounts of red dots shows the location of smaller earthquakes that form a direct line few km long.
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.

Minor earthquake swarm on Tjörnes Fracture Zone (east of Grímsey island)

Today (25-March-2021) a minor earthquake swarm took place east of Grímsey island. Earthquake swarms are common in this area. Largest earthquake in this swarm had a magnitude of Mw3,0. This earthquake swarm might not be over.

earthquake activity east of Grímsey island. Green star shows one earthquake with magnitude 3. Few red dots show smaller earthquakes
The earthquake activity east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.

Earthquake activity in the Tjörnes Fracture Zone often starts slowly before increasing. I don’t know if that is going to happen now since this area has been having a lot of earthquake activity in recent months.

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Moving Iceland geology to a bigger server

Because of current high traffic to this website I plan on moving it to a slightly larger server in the time between April to June. I am not sure yet when I can afford the change since this is a slightly more expensive option at 79€ a month from current price of 9,5€ a month (I also have other websites here that I won’t move since they get little to no traffic at all). I am also expecting far higher traffic to this website in the future when other Icelandic volcanoes start to go active for a long and short time period.

Minor earthquake swarm north-east of Grímsey island

Yesterday (01-March-2021) at 19:53 UTC an magnitude Mw3,3 earthquake took place north-east of Grímsey island. This might be a new earthquake swarm in this area since earthquake swarms in Tjörnes Fracture Zone often star slowly. Earthquake swarms are common in this part of Iceland.

Green star and yellow and red dots north-east of Grímsey island
Earthquake activity north-east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.

There is a chance of a stronger earthquake swarm in this area. Currently the activity remains small and nothing more might happen. This earthquake activity is not connected to what is happening on the Reykjanes peninsula.

Next article about Reykjanes peninsula activity is going to be written tomorrow (2-Mars-2021) unless something major happens.

Earthquake swarm east of Grímsey island

Since 4-February-2021 an earthquake swarm has been going on east of Grímsey island in the Tjörnes Fracture Zone. This was not a large earthquake swarm, with mostly just earthquakes with magnitude of Mw0,0 to Mw3,0. With largest earthquake taking place on 9-February-2021 at 20:20 UTC with magnitude Mw3,0. After that earthquake activity seems to have slowed down considerable amount.

Earthquake activity east of Grímsey island shown by blue and orange dots on the map. The earthquakes are out in the ocean.
Earthquake activity east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.

Earthquake activity is common in this area and in 2020 several large earthquake swarms took place in the Tjörnes Fracture Zone.

Small earthquake swarm on Tjörnes Fracture Zone south east of Grímsey island

Yesterdat (02-December-2020) at 11:38 UTC an small earthquake swarm started on Tjörnes Fracture Zone just south-east of Grímsey island. Largest earthquake in this swarm had a magnitude of Mw3,1. This earthquake swarm was small but there is also a strong snowstorm in Iceland and that has limited detection of earthquakes since late Monday (30-November-2020).


The Tjörnes Fracture Zone earthquake activity. Copyright of this image belongs to Icelandic Met Office.

This is a different area from the area that had strongest earthquake swarm in 40 years on Tjörnes Fracture Zone in June 2020 when the largest earthquake had a magnitude of Mw6,0. It is difficult to know if there is going to be more earthquake activity in this area. There is always a risk that is going to happen.

Felt earthquake 3 km north-east of Húsavík town last night

Yesterday (17-October-2020) at 22:02 UTC an earthquake with magnitude of Mw3,3 took place 3 km north-east of Húsavík town in the Flatey – Húsavík fault. This was followed by few minor earthquakes. This earthquake was felt in Húsavík but no damage was reported from it.


The earthquake activity close to Húsavík. Copyright of this image belongs to Icelandic Met Office.

This area of the Flatey – Húsavík fault has not seen any earthquake activity until now, even if there has been a strong earthquake swarm going on in nearby areas since June 2020 . There continues to be a risk of stronger earthquakes in Tjörnes Fracture Zone.

Strong earthquake activity in Flatey – Húsavík fault on Tjörnes Fracture Zone

Early morning today (6-October-2020) an large earthquake swarm took place in Flatey – Húsavík fault in Tjörnes Fracture Zone. Total of seven earthquakes with magnitude above Mw3,0 took place during the earthquake swarm this morning. Largest earthquake had a magnitude of Mw4,1 other magnitudes where smaller. Around 300 earthquakes took place during this earthquake swarm.


The earthquake activity on Tjörnes Fracture Zone. Copyright of this image belongs to Icelandic Met Office.

The largest earthquakes where felt and no damage was reported from this earthquake swarm. This earthquake swarm might be ongoing at the writing of this article. There is continued high risk of a earthquake with magnitude Mw6,0 to Mw7,0 in this area and on larger area in Tjörnes Fracture Zone because how complex the faults are in this area.

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