Today (27-June-2014) deep earthquakes where recorded in Katla volcano, the earthquakes had the magnitude of 0,8 and up to 1,5 with the depth from 23,7 km and down to 25,7 km.
The earthquakes in Katla volcano. The deep earthquakes are the ones the have the colour orange and inside Katla volcano caldera. Copyright of this image belongs to Icelandic Meteorological Office.
Earthquakes that are taking place at this depth happen due to magma movement and possibly dike intrusion of magma at depth. This does not mean that Katla volcano is about to erupt, it however clearly shows that something is happening inside Katla volcano system. Far as I know no surface changes have been spotted due to this activity, it remains unclear of that is going to change since what happens before a large eruption in Katla volcano is currently not well known or understood.
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Post updated at 19:12 UTC.