Earthquake swarm on the Reykjanes ridge
An earthquake swarm started yesterday, 30 June, at 21:00 on the Reykjanes ridge, about 30 km southwest of the tip of Reykjanes peninsula. Activity is still continuing at the time of writing (14:00).
The strongest earthquake so far was a magnitude M5.0 at 02:25 last night and it was well felt on the peninsula and in the capital area, as well as on a ship around 10 km away from the epicenter. A few more events of magnitudes between M4 and M5 have been detected since the onset of the swarm, and are still under manual revision.
As the swarm is taking place offshore and outside the IMO monitoring network, further data and information had to be requested from international seismic networks (the European EMSC and the German GEOFON networks).
Around 400 earthquakes have been detected up til now. The first burst of activity lasted until midnight. Since then, activity has occurred in pulses with two to three hours in between. The last pulse occurred bewteen 11:00 and 13:30 today. The last earthquake, which was felt and reported, occurred at 11:33.
Earthquake swarm on the Reykjanes ridge, preliminary results (see update on web).