Day: July 7, 2019

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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 This number is going to go quickly outdated.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there is a volcano that erupted in the year 1868 for about a month (December 1867 to January 1868) according to historical documents.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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Recording of the California, United States, Mw7,1 earthquake

This is my geophone recording of the Mw7,1 earthquake in California. I don’t have any comments on this activity since I don’t know anything about the tectonic settings in California and how the set-up is regarding fault lines and tectonics in this area. I did only record the surface waves clearly and that is unusual given the distance from the source of the earthquake (6756 km).


The Z (vertical) recording.


The North-South recording.


The East-West recording.

The surface waves are strongest on North-South recording. I did not record the Mw6.5 earthquake on the 4th of July.

Update

Due to errors I discovered I have corrected this article and the images used.