Update on the Tjörnes Fracture Zone earthquake swarm

Today (21-October-2019) at 12:25 UTC the earthquake swarm at Tjörnes Fracture Zone (TFZ) seems to have stopped rather quickly. Why that is I don’t know since this is unusual end to a large earthquake swarm. Close to 500 earthquakes were recorded in this earthquake swarm.


The earthquake swarm as of this evening. Copyright of this image belongs to Icelandic Met Office.

Largest earthquakes in this earthquake swarm had a magnitudes of 3,5 / 3,2 and 3,1. Other earthquakes were smaller in magnitude. There are reports of the largest earthquakes being felt in Húsavík village according to the news in Iceland. The end of this earthquake swarm does not mean activity is over in this area. This earthquake activity was tectonic in nature and no signs of magma being the reason for this earthquake activity.

Earthquake swarm on eastern Tjörnes Fracture Zone (close to the coastline)

Today (19-October-2019) an earthquake swarm started in eastern Tjörnes Fracture Zone. This is close to the coastline so it might be felt if any large earthquake happens. This earthquake swarm appears to be gearing up to be a strong one with many earthquakes every few minutes.


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

I have limited internet until 1st of November and I might not be able to update this article if something happens in this earthquake swarm or if a large earthquake happens.

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New earthquake swarm in Tjörnes Fracture Zone

Early this morning (27-July-2019) a new earthquake swarm started north of Siglufjörður village. This earthquake swarm is in a different location than the magnitude Mw4,3 earthquake took place on 24-July-2019. This earthquake swarm is slightly more north of that location. That means this is a different fault that is creating this earthquake swarm. It is unclear if this is connected to the magnitude Mw4,3 earthquake that happened on 24-July-2019.


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

The largest earthquakes at the writing of this article have the magnitude of Mw3,2. There is a lot suggesting that this earthquake swarm is ongoing as of writing of this article. Last earthquake to happen was at 20:07 UTC and had a magnitude of Mw2,7 (automatic). The risk of new earthquake swarms happening without warning and being bigger than what has happened so far remains high. The location of those earthquake swarm is going to be random and might be on land or out in the ocean. There is not any way to know were the next earthquake swarm is going to happen next.

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Earthquake swarm on north part of TFZ (north-west of Grímsey island)

Yesterday (24-July-2019) at 23:40 UTC and 23:42 UTC a magnitude Mw3,3 and Mw3,6 earthquake took place on the TFZ about 39 km west of Grímsey island. The two largest earthquakes were followed by a swarm of smaller earthquakes. Largest of those earthquake had a magnitude of Mw2,5. This earthquakes were not felt due to distance from populated areas.


The earthquakes 39 km north-west of Grímsey island. Copyright of this image belongs to Icelandic Met Office.

It is unclear if this earthquake activity is connected to the earthquake with the magnitude Mw4,3 that happened on 24-July-2019.

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Update on Tjörnes Fracture Zone earthquake (Siglufjörður village)

Today (24-July-2019) at 00:55 UTC an earthquake with the magnitude of 4,3 took place 20 km north-north-west of Siglufjörður village. The magnitude of the earthquake was downgraded from Mw4,6 to Mw4,3. This earthquake was felt over a wide area and minor damage was reported in Siglufjörður village, it was just items fallen off shelf. Largest aftershock had a magnitude of 2,7. There have been no major aftershocks at the writing of this article. This area had a earthquake swarm in 2012 with at least one earthquake with magnitude of Mw5,6 and one with magnitude of Mw5,5.


The Mw4,3 earthquake close to Siglufjörður village (green star). Copyright of this image belongs to Icelandic Met Office.


The earthquake as it appeared on my geophone in Böðvarshólar. Copyright Jón Frímann Jónsson.


The vertical (Z) movement on my geophone. Copyright Jón Frímann Jónsson.

There is a chance that a earthquake activity is increasing in Tjörnes Fracture Zone overall. Since its been a while since it had a major earthquake activity. With that I mean earthquakes with magnitude above Mw6,0.

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Magnitude Mw4,6 [automatic magnitude] earthquake felt in northern Iceland

At 00:55 UTC on 24-July-2019 an earthquake with a magnitude of 4,6 (automatic magnitude) happened just outside Siglufjörður town in north Iceland. This earthquake was felt over a wide area. I don’t have any more details at this moment.

Images of the earthquake with no magnitude and distance markers.


The earthquake as it appeared on my geophone in Böðvarshólar. This is vertical (Z).


The earthquake as it appeared on my geophone in Böðvarshólar. This is north-south.


The earthquake as it appeared on my geophone in Böðvarshólar. This is east-west.

I’ll post more updates on this earthquake tomorrow (after work) if nothing more happens.

Earthquake swarm on the south part of Tjörnes Fracture Zone (TFZ)

Since yesterday (6-July-2019) there has been a ongoing earthquake swarm in south part of the Tjörnes Fracture Zone (TFZ). The number of earthquakes recorded is close to 170 when this article is written. This number is going to go quickly outdated. Exact largest magnitude is not clear since automatic magnitude is not always correct.


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

At this location there is a volcano that erupted in the year 1868 for about a month (December 1867 to January 1868) according to historical documents. Global Volcanism Information can be found here. There are no sign of this earthquake activity being connected to a volcano activity. I don’t know if that is going to change.

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Earthquake swarm east of Grímsey island (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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Earthquake swarm south of Kolbeinsey island

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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Earthquake activity continues east of Grímsey island

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. 🙂