Earthquake with magnitude Mw3,2 in Tjörnes Fracture Zone

Today (3-November-2022) at 11:06 UTC an earthquake with magnitude of Mw3,2 took place in Tjörnes Fracture Zone. This earthquake took place a bit of a distance from land. This earthquake seems to be part of an activity that is now happening in Tjörnes Fracture Zone. This seems to be an ongoing earthquake swarm in this area.

Green star out in the ocean south of Grímsey island, this is far from land so this earthquake was possibly not felt. Few red dots around the map showing smaller earthquakes that have also happened.
Earthquake activity in Tjörnes Fracture Zone. Picture from Icelandic Met Office.

It is difficult to know what this earthquake activity means, if it means anything. Its been a while since Tjörnes Fracture Zone had a strong earthquake above Mw6,0 in this area and north of it. Earthquakes in Tjörnes Fracture Zone can go up to Mw7,0 in magnitude, those are rare and happen only after a long time period of quiet it seems.

Earthquake with magnitude Mw4,0 south east of Grímsey island

During the night of 27-October-2022 an earthquake with magnitude of Mw4,0 took place at 02:13 UTC. This earthquake was followed by few minor earthquakes. This earthquake was also felt in Grímsey island and in Akureyri town.

Green star south east of Grímsey island in the ocean. Where the magnitude Mw4,0 earthquake took place.
Earthquake activity south east of Grímsey island. Picture from Icelandic Met Office.

There’s a good chance of more earthquake activity in this area. Since this seems to connected to or be part of an earthquake swarm that started on 8-September-2022.

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Earthquake swarm north of Grímsey island

Today (19-October-2022) at 10:26 UTC an earthquake with magnitude of Mw3,8 took place and at 11:58 UTC an earthquake with magnitude of Mw3,3 took place at the same location. I don’t know if any of the larger earthquakes where felt. A swarm of smaller earthquakes took place and that activity is ongoing when this article is written.

Two green stars north of Grímsey island in Tjörnes Fracture Zone. This is out in the ocean far from land and populated areas.
Earthquake activity north of Grímsey island. Picture is from Icelandic Met Office.

This earthquake activity probably is continuation of an large earthquake swarm that started in that area in September. I don’t know if this is going to result in more stronger earthquakes, but that is a possibility.

Earthquake swarm south and east of Grímsey island

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.

Red dots east and south of Grímsey island along with two green stars that show the largest earthquakes. On a blue background and the coastline is fjords and small peninsuals in north-eastern Iceland.
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.

Update on the earthquake swarm east of Grímsey island (12-September-2022)

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.

Green stars and red dots in line east of Grímsey island in the ocean. Green star is also close to Húsavík, but that might be an error in recording
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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Magnitude Mw4,9 earthquake east of Grímsey island (Tjörnes Fracture Zone)

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.

A lot of green stars showing earthquakes over magnitude 3,0 east of Grímsey island and more red and orange dots showing smaller earthquakes. The map is brown for land mass and blue for ocean area, were the earthquake swarm is taking place
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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Earthquake swarm in Tjörnes Fracture Zone rift valley

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.

Green star out in the ocean showing the largest earthquake in a small earthquake swarm that took place far north of Akuryeir town. Few earthquakes east of Grímsey island
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.

Earthquake activity in Tjörnes Fracture Zone

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.

Green star out on the ocean east of Grímsey island where the Mw3,2 earthquake took place
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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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.