Category: Tjörnes Fracture Zone

A small earthquake swarm started today (30-June-2019) east of Grímsey island. Largest earthquake in this swarm had a magnitude of 3,6. There are no news that it had been felt.

The earthquake east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.

This is one of several earthquake swarms in this area of Tjörnes Fracture Zone this year. More activity can be expected in next few months. This earthquake swarm activity appears to be only tectonic in nature.

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Yesterday (27-May-2019) an earthquake swarm took place south of Kolbeinsey island, but this earthquake swarm is in Tjörnes Fracture Zone (TFZ). Largest earthquake had a magnitude of 3,5 at 01:35 UTC. Second largest earthquake had a magnitude of 3,1 and took place at 06:57 UTC. Other earthquakes in this earthquake swarm were smaller in magnitude.

The earthquake swarm in Tjörnes Fracture Zone (green stars). Copyright of this image belongs to Icelandic Met Office.

It appears that this earthquake swarm is over for now. It might start again without warning since earthquake activity in Tjörnes Facture Zone is unpredictable.

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Today (12-April-2019) an earthquake swarm took place east of Grímsey island. This earthquake swarm is in a place that has been having many earthquake swarms in recent weeks. Largest earthquake in this swarm had a magnitude of 2,7 and other earthquakes were smaller in magnitude. As of writing this article the earthquake swarm seems to have stopped, how long that is going to last is impossible to know.

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

Current outlook for this area of Tjörnes Fracture Zone is that earthquake activity is going to continue as it has been doing since January when this whole thing started slowly. There is not possible to know when this earthquake sequence ends in Tjörnes Fracture Zone. The risk of a large earthquakes continues to be in this area at the writing of this article.

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Update added on 24-April-2019

If you are donating with a bank. Please update your information again to my Danish bank. Since I am on my way to move back to Denmark in next few months. All the information can be found here. Thanks for the support. 🙂

I am sorry for the late posting of this earthquake activity.

During the night of 8-April-2019 at 04:44 UTC an earthquake with magnitude 3,3 took place east of Grímsey island. This earthquake is part of a swarm earthquake activity in this area that started few weeks ago and is mostly ongoing as of writing this article.

The earthquake activity east of Grímsey island. Copyright of this image belongs to Icelandic Met Office.

The earthquake swarm west of Kópasker village continues and there continue to happen several earthquakes each day in that area. There are no clear signs showing that this earthquake activity is about to stop.

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The earthquake swarm that started on 23rd of March 2019 west of Kópasker village is ongoing and hasn’t stopped since that time. Number of earthquakes and magnitude of earthquakes have mostly dropped and in last few days there hasn’t been any earthquake that has reached magnitude 3,0 or larger. This might change without warning since this earthquake activity is ongoing.

The earthquake swarm west of Kópasker village. Copyright of this image belongs to Icelandic Met Office.

According to recent news articles this is the strongest and longest earthquake swarm on this fault since 1991 (28 years) according to data that scientist at Icelandic Met Office looked at in their records. This is as far back their data possibly go back for this part of Iceland. Over 3000 earthquakes have been recorded in this earthquake swarm since it started.

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This is a update on the earthquake swarm on Tjörnes Fracture Zone. Information in this article might get outdated quickly.

The earthquake swarm is ongoing as of writing of this article, it has now been going for a week. Since Wednesday there haven’t been any earthquakes over magnitude 3,0. Largest earthquake have reached magnitude 2,9 in last 48 hours. Total number of earthquakes in last 48 hours is around 567.

The earthquake swarm west of Kópasker village. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm has been slowly getting less intense and fewer earthquakes have been recorded since yesterday than the days before. It does not mean that this earthquake swarm is over. It might increase again if a large earthquake happens (magnitude 4,0+).

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Uncertainty level has been declared in the area close to Kópasker village due to this earthquake swarm. This is the lowest alert level in Iceland.

Since this earthquake swarm started on Saturday around 1800 earthquake have taken place according to Icelandic Met Office. Largest earthquakes in the last 24 hours have magnitude 3,8 and 3,0. This might change in next few hours since this earthquake swarm is ongoing.

The earthquake swarm (green stars) west of Kópasker. Copyright of this image belongs to Icelandic Met Office.

This earthquake swarm has increased the risk of a magnitude 6,0 or larger earthquake in the Tjörnes Fracture Zone. This earthquake swarm is large for this part of the Tjörnes Fracture Zone.

At 20:29 UTC an magnitude 4,2 earthquake took place in the earthquake swarm west of Kópasker village. This has increased the earthquake swarm in this area. The magnitude 4,2 was followed by a magnitude 3,3 earthquake few seconds later.

Earthquake swarm west of Kópasker (green stars). Copyright of this image belongs to Icelandic Met Office.

The earthquake swarm is currently ongoing and this information might change without warning.