Category: Tjörnes Fracture Zone

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 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.

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.

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.

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

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.

Today (25-September-2020) at 11:37 UTC an earthquake with magnitude of Mw3,7 and this earthquake started an earthquake swarm in this location for the last several hours. At the writing of this article between 80 to 90 earthquakes have taken place at this location. There are no reports about this earthquake having been felt in Grímsey island.

The earthquake swarm east of Grímsey island. This image is used with permission and copyright belongs to Icelandic Met Office.

This earthquake swarm is not connected to the earthquake activity on the western part of Tjörnes Fracture Zone. This earthquake swarm is ongoing at the writing of this article.

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Today (15-September-2020) at 14:52 UTC an earthquake with magnitude Mw4,6 took place on Flatey – Húsavík fault line. This earthquake was felt over a wide area and at the writing of this article no damage has been reported in the news.

The earthquake activity in Tjörnes Fracture Zone. Image used with permission and copyright belongs to Icelandic Met Office.

Second largest earthquake took place at 17:06 UTC and had a magnitude of Mw4,0. This earthquake was felt but less than earlier earthquake because of smaller magnitude. This earthquake activity has increased the risk of a large earthquake in this area or on nearby faults. This might result in a earthquake in the magnitude range of Mw6,0 to Mw7,1 in this part of the Tjörnes Fracture Zone. The earthquake swarm is ongoing at the writing of this article.

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Yesterday (14-September-2020) an earthquake with magnitude of Mw3,4 took place in Tjörnes Fracture Zone, this earthquake was felt in Dalvík and Ólafsfirði towns. This is the first earthquake with magnitude above Mw3,0 in at least a month in this area. The earthquake swarm has been ongoing but all the earthquakes that have happened have been small in magnitude.

The earthquake swarm in Tjörnes Fracture Zone. This image is used with permission and copyright belongs to Icelandic Met Office.

This earthquake swarm is ongoing as it has been since 19th of June 2020 when it started. I don’t expect that to change and risk of a large earthquake remains in the Tjörnes Fracture Zone.

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