Update 1 on the earthquake swarm on Tjörnes Fracture Zone

Today (20-June-2020) at 15:05 a magnitude Mw5,2 earthquake took place on Tjörnes Fracture Zone (TFZ). Information in this article is going to go outdated quickly.


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


The earthquake activity is dense and there is a lot of earthquakes happening every minute. Copyright of this image belongs to Icelandic Met Office.


The earthquake as recorded by my geophone (Hvammstangi 2).


The earthquake as recorded by my geophone (Hvammstangi 1).


The earthquake as it appeared in the program I use to monitor earthquakes.

According to the news rock fall happened in mountains when the largest earthquake took place. There is also a risk of stronger earthquake due this earthquake swarm location according to Icelandic Met Office. If a stronger earthquake happens the risk of rock fall is high.

12 Replies to “Update 1 on the earthquake swarm on Tjörnes Fracture Zone”

  1. 19:26, M5.4, but it’s not yet manually checked, and the spike looks way bigger than the M5.2 earlier.

    1. That was 5.6, but felt like a f……’ ragnarök up here in the north.

  2. A second test comment to see if I have fixed the email sending bug I discovered in my WordPress setup. Its a holdover bug from the setup process and should not be here.

  3. Why is this area suffering d om all these strong earthquakes? Does it happen regularly?

    1. Large earthquake swarms like this one happen regularly in the Tjörnes Fracture Zone. What us unusual now is that its been a long time since a large earthquake took place in Tjörnes Fracture Zone and that increases the risk of strong earthquake (magnitude Mw7,1).

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