Overview of Earthquake activity

The IMO's automatic earthquake monitoring system detected about 2,980 earthquakes in August, of which approximately 2,727 have been reviewed. Most of the earthquakes occurred on the Reykjanes Peninsula and the Reykjanes Ridge. A total of 13 earthquakes above magnitude 3 were recorded, the largest being a M3.8 event in the Brennisteinsfjöll mountains on 18 August, which was widely felt in the Capital Area and beyond.

The Icelandic Meteorological Office's automatic earthquake monitoring system recorded around 2,600 earthquakes in June 2025, of which more than 2,500 have been reviewed. The largest earthquake of the month was measured at magnitude 3.7 near Grjótárvatn on June 16. Additionally, an earthquake of magnitude 3.4 was measured in Trölladyngja on June 19, and the Meteorological Office received reports that the earthquakes had been felt in populated areas.

The Icelandic Meteorological Office's automatic earthquake monitoring system recorded around 6,000 earthquakes in May 2025, of which more than 3,800 have been reviewed. A strong earthquake swarm began approximately 10 km east of Grímsey on May 13, with nearly 2,000 earthquakes measured there within a single week. Of those, 14 earthquakes were larger than magnitude 3.0. On the first day of the swarm, two earthquakes of magnitude 4.7 were recorded, and on the second day, the largest quake of the swarm was measured at magnitude 5.0, making it the second-largest earthquake of May 2025. The largest earthquake of the month was magnitude 5.1 and occurred on May 24, about 26 km southwest of Reykjanestá. This earthquake was part of a fairly intense swarm during which nearly 600 earthquakes occurred in just under three days, including 40 earthquakes around or above magnitude 3.0.

Further overview of earthquake activity can be seen at  Skjálftalísa