Yesterday (20-March 2020) an earthquake swarm took place in Krýsuvík volcano. Largest earthquake in this swarm had a magnitude of Mw3,0. This earthquake swarm has stopped as of writing of this article. It is unclear if this earthquake swarm is due to magma activity or just tectonic stresses.
Earthquake activity in Krýsuvík volcano. Copyright of this image belongs to Icelandic Met Office.
There have been earlier earthquake swarm in this same area in recent weeks after the activity at Reykjanes volcano started earlier this year. If that is connected remains a question.
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Yesterday (19-March 2020) an earthquake swarm took place close to Grindavík town (Þorbjörn mountain) in Reykjanes volcano. This earthquake swarm was has several hundred earthquakes and many of the earthquakes were at shallow depth and it is not understood why that was. Largest earthquakes in this swarm had a magnitude of Mw3,0, Mw3,2 and Mw3,3. Other earthquakes that took place were smaller in magnitude. The earthquake swarm seems to be over for now but this activity happens in swarms and how long and how strong each swarm is different.
The earthquake activity north of Grindavík town. Copyright of this image belongs to Icelandic Met Office.
Inflation continues in this area and that is the reason why this earthquake swarm activity happens. What seems to be happening now is that more activity is happening and it is happening over a wider area. At the writing of this article there are no signs that magma is finding a path to the surface.
I have now managed to make my geophone network active again. I had to move the software from (operating system) from Windows to Debian Linux because Windows 10 just doesn’t work for this. In the future I have to move my main computer to Debian Linux but it is going to be a little while until that happens because I need to backup data before I can change operating systems on my main earthquake computer (along with other problems that I need to resolve before this can happen). The geophones that I have up and running can be viewed here.
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