Since midnight 1st Aug several events of M>=4 have occurred. At 3:14, an earthquake of magnitude M4.3 was detected about 4 km SSW of Fagradalsfjall. At 3:41 an earthquake of M4.2 was detected about 4 km N of Grindavík. At 4:51 an earthquake of M4.4 occurred around 3.3 km NW of Grindavík. At 08:02 a M4 occured at southwestern Kleifarvatn. Quite a few earthquakes over M3 have been detected tonight.
At 17:48 yesterday, an earthquake of magnitude M5.4 occurred about 3km ENE of Grindavík. It was felt east to Fljótshlíð and west to Snæfellsnes. This earthquake was a trigger earthquake, due to the magma intrusion by Fagradalsfjall.
A strong seismic swarm is ongoing just northeast of Fagradalsfjall, and trigger earthquakes are occurring east and west of Fagradalsfjall. The activity started around noon yesterday and since then around 5,500 earthquakes have been recorded on the IMO's automatic system.
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