Herðubreiðartögl earthquake swarm update 6-May-2014

This is an update on the earthquake swarm in Herðubreiðartögl on 6-May-2014. This information might go outdated quickly if the activity in this earthquake swarm changes suddenly.

For the past 24 hours the earthquake activity in Herðubreiðartögl has been dropping. This means fewer earthquakes overall, the magnitude of earthquakes taking place has also been getting lower, with strongest earthquakes just in the magnitude 2,5 to 2,9 range. In the past 24 hours no magnitude 3,0 or larger earthquake has taken place.

The earthquake activity in Herðubreiðartögl on 6-May-2014. Copyright of this image belongs to Icelandic Meteorological Office.

The earthquake tracer at Icelandic Meteorological Office website clearly shows the drop in activity. Copyright of this image belongs to Icelandic Meteorological Office.

My earthquake counter clearly shows this drop in earthquake activity. It is for all of Iceland, but majority of earthquakes over the past days are from Herðubreiðartögl. This image is released under Creative Commons Licence. Please see CC Licence page for more details.

I did discover today that Icelandic Meteorological Office has updated its drumplot website. So its now possible to see the earthquakes directly. The drumplot here above is from Askja SIL station, it clearly shows the earthquake activity in Herðubreiðartögl. The website with the drumplots can be found here (I have just found this website in Icelandic, there does not appear to be English version available). Copyright of this image belongs to Icelandic Meteorological Office.

It remains difficult to know for sure what is the source of this earthquake swarm. There is a slight chance it might be due to magma injection at depth, but that remains unproven as is. My geophone stations (I only got two running now) are going to show the largest earthquakes and they are going appear clearly. It can be viewed here.

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Article updated at 21:22 UTC on 6-May-2014.
Article updated at 21:37 UTC on 6-May-2014.