Weekly Overview, 17 - 23. April, 2023

Around 560 earthquakes occured this week by IMO‘s SIL seimic network, fewer then the previous week when they counted around 620 in total. The most seismic activity was measured on the Tjörnes fracture zone with around 90 events located in the Eyjafjarðaráll north of Eyjafjörður, where the largest event of the week was detected, M4.2 on April 18th at 7:59 am. It was felt in the town of Siglufjörður. Quite more activity was detected in Vatnajökull glacier compared to previous week with a M3.2 in Bárðarbunga caldera on April 23rd and on the same date three events of M2.5 and above were located in Grímsvötn, the largest one of M3.3.

Activity in Askja and Heðurbreið was less than previous week but three earthquakes were located in Geitlandsjökull glacier. One event was located in Fljót in Skagafjörður, of M2.8, where earthquakes are rare but have been located before.

Activity in Reykjanes peninsula was less than previous week and it was quite scattered. Events north of lake Hlíðarvatn are still being located, the largest one M2.7 on April 17th.  One earthquake was located in Mt. Hekla and the Hengill area near Húsmúli was more active than previous week.