Reykjanes Peninsula current seismic swarm - location of earthquakes and magnitude as of 07.31.2022 / 6:25 p.m. - Doc. IMO
Small seismic swarm update in Reykjanes Peninsula.
At 03:14, an earthquake of magnitude M4.3 was detected about 4 km SSW of Fagradalsfjall. At 03:41 an earthquake of M4.2 was detected about 4 km N of Grindavík. At 4:51 a.m., an M4.4 earthquake occurred about 3.3 km northwest of Grindavík. Many earthquakes greater than M3 have been detected this evening.
Yesterday at 5:48 p.m. an earthquake of magnitude M5.4 occurred about 3 km ENE of Grindavík. It was felt east to Fljótshlíð and west to Snæfellsnes. This earthquake was a trigger earthquake, due to magma intrusion by Fagradalsfjall.
Nearly 3,000 earthquakes have been recorded since noon yesterday, including 50 of magnitude 3 and four of magnitude M4. GPS data suggests that the earthquake swarm is caused by the movement of magma under the ground. Sigríður Kristjánsdóttir, who is also a natural hazard expert, said the Met believed there was lateral movement of magma occurring at a depth of 5-7 km. The Met was paying close attention to any changes in the depth of the seismic activity, particularly if it became more shallow, "as this would indicate that the magma is pushing a little higher".
To be continued ...
Sources: IMO & RUV
Reykjanes Peninsula current seismic swarm - location of earthquakes and magnitude as of 01.08.2022 / 05:45 - Doc. IMO