Category: TFZ

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Update on the earthquake swarm east of Grímsey island in Nafir volcano

This is a short update on the earthquake swarm east of Grímsey island in the Nafir volcano (no Global Volcanism Program profile). Yesterday (19-March-2019) a magnitude 3,2 earthquake happened. Other earthquakes both before and after it are smaller in magnitude. In total over 200 earthquakes appear to have taken place in this earthquake swarm.


Earthquake activity yesterday (19-March-2019) in Nafir volcano. Copyright of this image belongs to Icelandic Met Office.

Earthquake activity has currently stopped. Based on the pattern in the earthquake swarm last year this might not be over and this might be going on for weeks until a peak is reached in earthquake swarm activity. It is impossible to know for sure what happens next in this earthquake activity in this area.

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Earthquake swarm east of Grímsey island (Tjörnes Fracture Zone)

During the night of 18-March-2019 an earthquake swarm started east of Grímsey island in a volcano called Nafir (no Global Volcanism Program profile). The only GVP profile that exists is about the volcano south of this one (GVP profile can be found here). The volcano in this area doesn’t have any documented eruption history in recent 10.000+ years. This might be wrong due to lack of research. In 2018 there was a strong earthquake swarm in this area. Articles connected to that earthquake swarm can be read here. Top of the earthquake activity on 19th of February 2018 looked like this as I wrote in a article last year. Current earthquake activity suggests a repeat of last year activity, only time is going to show if this does happen, but clues are strong in that direction. Earthquake activity in this area is complex and this is a rift valley it is taking place in.


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

Largest earthquake so far has the magnitude of 3,3 and other earthquakes are smaller in magnitude. Currently around 55 earthquakes have been recorded. The earthquake swarm is ongoing even if current rate of earthquakes is low.

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Earthquake swarm in Tjörnes Fracture Zone south of Grímsey island

Since yesterday (10-November-2018) and today (11-November-2018) there has been a earthquake swarm in Tjörnes Fracture Zone (TFZ). Largest earthquake in this swarm had a magnitude of 3,0. All other earthquakes have been smaller in magnitude. At this moment around 130 earthquakes have been recorded in this earthquake swarm. There are no reports of earthquakes in this swarm being felt by nearby population areas.


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

This earthquake swarm seems be ongoing, even if it has slowed down at them moment. It is a question if it is going to continue or stop in the next few hours to days.

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Minor earthquake swarm in Tjörnes Fracture Zone

Today (6-November-2018) there has been a minor earthquake swarm in Tjörnes Fractures Zone (TFZ). Largest earthquakes in this swarm had a magnitude of 2,7 and 2,6. Other earthquakes that have happened so far have been smaller in magnitude.


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

This earthquake swarm seems to be mostly over at the moment. There is a good change it might resume at later time, if it isn’t completely over now. New earthquake swarm might also start in this same area without warning. It is impossible to know for sure what happens next in Tjörnes Fracture Zone.

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Earthquake swarm north of Gjögurtá (Tjörnes Fracture Zone)

At 21:10 UTC a earthquake swarm started in Tjörnes Fracture Zone just north of Gögurtá. Largest earthquake so far had a magnitude of 3,7. Other earthquakes so far have been smaller in magnitude so far. That might change without warning.


The earthquake swarm in TFZ. Green star is the magnitude 3,7 earthquake. Copyright of this image belongs to Icelandic Met Office.

There is some mislocation on the map at the moment due to the automatic location system at Icelandic Met Office website.

Since my geophone at Böðvarshólar is down due to a failed computer and I cannot afford Raspberry shake sensor (weatherproof type) only the largest earthquakes are going to be recorded at Dellukot geophone.

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Magnitude 3,3 earthquake in Tjörnes Fracture Zone

At 22:41 UTC a magnitude 3,3 earthquake took place 6 km north of an area called Gjögurtá. This earthquake had a magnitude of 3,3 and was followed by several smaller earthquakes. Activity seems to be ongoing at the moment.


The earthquake 6 km north of Gjögurtá in Tjörnes Fracture Zone. Copyright of this image belongs to Icelandic Met Office.

Earthquake activity is common in this part of Iceland. There are no active volcanoes in this area and no known volcanism in this exact area.

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Earthquake off the coast of Siglufjörður village

A single magnitude 3,5 earthquake has happened off the coast of Siglufjörður village. At the moment this is the only earthquake that has been detected so far.


The earthquake off the coast of Siglufjörður village (green star). Copyright of this image belongs to Icelandic Met Office.

It happens every few months that a single earthquake happens somewhere in Iceland. There is a possibility that more earthquake activity might happen in this location. Sometimes however that does not happen.

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Earthquake activity east of Grímsey island yesterday

Yesterday (05-April-2018) two earthquakes happened east of Grímsey island. The first earthquake had a magnitude of 3,0 (18:12 UTC) and the second earthquake had a magnitude of 3,3 (18:14 UTC). There is a good chance both earthquakes where felt in Grímsey island even if it was not reported.


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

Few smaller earthquakes followed the main earthquake events but since then everything has been quiet in this area.

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Earthquake swarm 43 km west of Grímsey island

Yesterday (31-March-2018) at 09:35 UTC a magnitude 3,2 earthquake happened 43 km west of Grímsey island. Due to distance from land this earthquake was not felt far as I know. Second largest earthquake had a magnitude of 2,6. All other earthquakes where smaller in magnitude.


The earthquake activity 43 km west of Grímsey island (green star). Copyright of this image belongs to Icelandic Met Office.

There is also a developing earthquake swarm just off the coast of Gjögurtá (red dots on the image above). So far it has not resulted in any strong earthquake and its unclear if that is going to happen.

I would have written this article sooner but I fell asleep.

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Minor earthquake activity on Tjörnes Fracture Zone

During the night a minor earthquake swarm took place on two parts of the Tjörnes Fracture Zone. The first earthquake swarm was just 19,9 km north-east of Siglufjörður village. Largest earthquake in that swarm had a magnitude of 3,1.


The earthquake activity in Tjörnes Fracture Zone. Largest earthquake is the green star. Copyright of this image belongs to Icelandic Met Office.

The second earthquake swarm was north-east of Grímsey Island and it was a minor swarm. Largest earthquake in that swarm had a magnitude of 2,8. Other earthquakes that happened were smaller in magnitude.

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