Posted on by Jón Frímann

Update five on the earthquake swarm in Tjörnes Fracture Zone (TFZ)

This is the last update on the earthquake swarm activity until something more happens in Tjörnes Fracture Zone.

Current earthquake activity is getting smaller at the writing of this article and few earthquakes over magnitude Mw3,0 are happening now. Over the last 48 hours only 5 earthquakes have reached magnitude Mw3,0 and larger and only around 650 earthquakes have happened in the last 48 hours. Largest of this earthquakes had a magnitude of Mw4,1 today at 04:52 UTC.


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

The risk of magnitude Mw7,0 to Mw7,4 earthquake remains in Tjörnes Fracture Zone after this activity and there is still a warning in place for it. The fault that moved on Sunday 21st June in the Mw6,0 (USGS/EMSC. IMO reports MW5,8) earthquake seems to have been 20km to 30km long based on the earthquake activity along the fault rupture in north-south direction about 33 km west-south-west of Grímsey island. At the writing of this article there have been over 7000 earthquakes been detected by Icelandic Met Office.

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3 Replies to “Update five on the earthquake swarm in Tjörnes Fracture Zone (TFZ)”

  1. Hi Jon, long time reader seldom posts but I just want to let you know that I am getting SSL_ERROR_BAD_CERT_DOMAIN warning when connecting to your blog. It works fine in Chrome’s incognito mode though.

    1. Thanks for letting me know. This error is because the ‘www’ is not part of the ssl certificate. An exception can be added to the security warning to get the redirect working properly since I don’t use the ‘www’ on my website. This error is mostly annoying but I am not sure if I can fix it because this is a different type of hosting that I am using now and I don’t have any control over the ssl certificate part of the website.

      I hope that next time this ssl certificate updates in September that this ssl error vanishes but that might not happen.

  2. Small glacial outburst from Myrdalsjökull (Múlakvisl). Conductivity at around 200 microSiemens/cm. Also some sharp spikes showing on Austmannsbunga seismometers. It’s ordinary summer activity for Katla, but I’m reporting any way. 🙂

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