Strong earthquake swarm in Bárðarbunga volcano

Today (6-April-2017) a strong earthquake activity took place in Bárðarbunga volcano. This earthquake activity started this morning at 10:46 UTC and has continued during the day at slow phase. The largest earthquake so far took place at 15:08 UTC and had magnitude of 4,1 and second largest earthquake had a magnitude of 3,2. Other earthquakes are smaller and a around dozen or so have taken place today in Bárðarbunga volcano.

The earthquake swarm in Bárðarbunga volcano. Copyright of this image belongs to Icelandic Met Office.

This earthquake activity is in line with earlier earthquake activity that has been going on in this area since September-2015. What is slightly different now is that I got two different seismic signals on my geophone stations in Böðvarshólar and the one in Heklubyggð on the North-South direction (Heklubyggð is west-south of Bárðarbunga, Böðvarshólar is west-north of Bárðarbunga). This difference seems to suggest that some type of slip movement took place during this earthquake. I don’t know for sure what this change in pattern means at the moment. The best I can do now is to monitor the earthquakes I detect in the future for more such earthquake signal changes like I did just see on my geophone. I’m not fully sure what is going on in Bárðarbunga volcano at the moment, what is known is that inflation is currently taking place in Bárðarbunga volcano and that process has been ongoing since September-2015.

Update 07.04.2017 – Anomaly detected on my Böðvarshólar geophone

This is the anomaly detected on my Böðvarshólar geophone. It can be seen on N-S direction. This is not the geophone, its working as expected and that got confirmed today when a minor (magnitude 2,1) earthquake took place not far from the Böðvarshólar geophone.

Böðvarshólar geophone.

Heklubyggð geophone.

Detailed image of the earthquake at Böðvarshólar geophone.

Detailed image of the earthquake in Heklubyggð geophone.

The difference is appearance of the P-wave and the S-wave. I don’t know why this is or why it happened. I’ve not seen this before.


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Article updated at 21:32 UTC on 07.04.2017.