An intense earthquake swarm has been going on offshore North Iceland, 10 km NW of Gjögurtá, since September 25, 2013. This morning, 2 earthquakes reaching magnitude 3 and 3.2 occurred at 06:14 and 07:41 UTC. Roughly 1 000 earthquakes have been recorded by Icelandic Meteorological Office in last 6 days.
The depths of the quakes vary from about 15 km depth (crust-mantle boundary) to near surface. The area is located on an active fault line related to rifting, and a possible cause of the earthquake swarm could be a magmatic intrusion at Tjörnes Fracture Zone volcano.