A new dike intrusion has started in Katla volcano caldera. So far only few earthquakes have taken place. But the largest one so far is ML2.8 in size with the depth of 0.8 km (800 meters). It appears clearly on my geophone at Hekla volcano. But it seems that new area in the Katla volcano caldera has been increasing activity during past few weeks. Based on the number of earthquakes that are currently taking place there.
The earthquake as I did record it on my Heklubyggð geophone. This are all the directions on the gephone. This picture is released under Creative Commons licence.
The North-South component of the geophone shows the nature of this earthquake clearly. This picture is released under Creative Commons licence.
The vertical component of the geophone did also show the nature of this earthquake clearly. This picture is released under Creative Commons licence.
The area inside Katla volcano caldera that is responsible for the current earthquake activity. Copyright of this picture belongs to Iceland Met Office.
The earthquakes in Katla volcano now are created by magma intrusion into the rock layers. There is not a lot of about tectonic earthquakes in Katla volcano today. But they cannot be completely ruled out. But the signature of those earthquakes is different then by earthquakes created by magma movements.
Note: I have been recording earthquakes since the year 2006. I have learned a lot during that time.