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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Increase in earthquake swarm east of Grímsey island during the night of 26-September-2020

During the night of 26-September-2020 the earthquake swarm that has been going on east of Grímsey island in area called Nafir increased. Total of six earthquakes with magnitude above Mw3,0 took place during the night and the largest earthquakes had a magnitude of Mw4,3. This area has a volcano that is unnamed but often called Nafir. There is no Global Volcanism Program profile on this and last eruption in this volcano is unknown. The largest earthquakes where felt in Grímsey island and other nearby populated areas. According to Icelandic news people of Grímsey island are tired of the constant earthquake activity that has been going on in Tjörnes Fracture Zone since 19th June 2020.


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

In February 2018 a magnitude Mw5,2 earthquake took place in this location. There are no sign that an eruption is about to happen with this volcano but that is difficult to be sure about. All this earthquake activity currently seems to be tectonic in nature as it is happening in a rift valley in this location. Magma movement and any eruption is going to appear clearly on Grímsey SIL station and other nearby SIL stations in north Iceland. More earthquake activity is expected in this area and current earthquake swarm is ongoing at the writing of this article.

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Earthquake swarm east of Grímsey island

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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Strong earthquake swarm in Tjörnes Fracture Zone – Flatey – Húsavík fault

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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Earthquake yesterday (14-September-2020) in Tjörnes Fracture Zone

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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New earthquake swarm in Tjörnes Fracture Zone (volcano)

Today (21-August-2020) an earthquake swarm started in Tjörnes Fracture Zone volcano. It is unclear if this earthquake activity is because of tectonic activity. Largest earthquake in this swarm had a magnitude of Mw3,2 at the writing of this article. Other earthquakes in this swarm had smaller in magnitude.


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

This is a new earthquake swarm and is not connected to the earthquake swarm in the western part of Tjörnes Fracture Zone. This are two separate earthquake swarms now happening. This earthquake activity is ongoing at the writing of this article in both earthquake swarms.

Two strong earthquakes in Tjörnes Fracture Zone during the night

During the night of 8-August-2020 at 03:42 UTC an earthquake with magnitude of Mw4,6 took place in Tjörnes Fracture Zone on Flatey – Húsavík fault. This earthquake was felt and did wake people up from their sleep. A second earthquake with magnitude of Mw3,7 took place at 03:52 UTC. Both earthquakes were felt. No damage happened in this earthquake. After the largest earthquakes happened a swarm of smaller earthquakes took place.


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

This earthquake swarm is the same one that started on 19-June-2020 and has been ongoing since then. This earthquake swarm has not been as strong as it was in June at the moment. There is a permanent risk of a magnitude Mw7,0 earthquake in this area while the earthquake swarm is ongoing. There are no signs that this earthquake swarm is about to end.

Renewed earthquake swarm activity in Tjörnes Fracture Zone (TFZ)

Today (4-August-2020) at 15:16 earthquake with magnitude Mw3,3 took place in Tjörnes Fracture Zone in the area that has been having earthquake swarm since 19-June-2020. Before this earthquake happened an increase in smaller earthquakes happened.


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

The earthquake swarm in this area of Tjörnes Fracture Zone is now in its second month and doesn’t show any sign of ending. Currently there is a risk of a magnitude Mw7,0 earthquake in this area while this earthquake swarm continues.

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Three strong earthquakes in Tjörnes Fracture Zone close to Gjögurtá

During the night (19-July-2020) three earthquakes took place in Tjörnes Fracture Zone on the Flatey – Húsvík fault. Around midnight earthquake activity started to increase on the Flatey – Húsavík fault. The first earthquake with magnitude Mw3,0 took place at 02:54 UTC and the largest earthquake with magnitude Mw4,4 took place at 03:07 UTC and the second largest earthquake with magnitude Mw3,3 took place at 07:05 UTC. More earthquakes with magnitude above Mw3,0 can’t be ruled out and there remains a risk of earthquake with magnitude of Mw7,0 is going to happen in this area.


The earthquake activity in Tjörnes Fracture Zone for the last 48 hours. Copyright of this image belongs to Icelandic Met Office.

This is the largest earthquake since 8th July 2020 when a magnitude Mw4,2 earthquake took place in this area in the rift valley that is also active during this earthquake swarm. Over 14.000 earthquakes have been recorded since start of this earthquake swarm on 19th June 2020. This earthquake swarm is ongoing at the writing of this article.

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