Latest InSAR images near the Fagradalsfjall eruption site in Reykjanes Peninsula, Iceland show clear signs of deformation over the period from December 20 to 26, 2021. The deformation seen now is very similar to the deformation observed at the end of February 2021 when a dike intrusion was starting near Fagradalsfjall.
The earthquake swarm that started on December 21 near Fagradalsfjall has continued over the Christmas holidays, the Icelandic Met Office (IMO) reports.1
Around 3 000 earthquakes have been detected every day since the swarm started, with most of the activity near Fagradalsfjall volcano but earthquakes have also been detected near the town of Grindavík and lake Kleifarvatn.
The earthquakes near Grindavík and Kleifarvatn are interpreted as triggered earthquakes due to increased pressure caused by a dike intrusion near Fagradalsfjall.
On Christmas Eve, December 24, three earthquakes above M4 were detected near Grindavík, with the largest one M4.8. The activity is episodic with periods of very intense earthquake activity.
There are currently no signs of magmatic intrusions in other places.
The swarm started just one day after the eruption that began in this area on March 19, 2021, was declared officially over. It was the longest eruption in Iceland in more than 50 years.2
Latest InSAR images show clear signs of deformation over the period from December 20 to 26.
The deformation seen now is very similar to deformation observed at the end of February this year when a dike intrusion was starting near Fagradalsfjall.
This InSAR data supports data from GPS measurements showing deformation in the same area.
Image credit: IMO, Copernicus EU/Michelle Parks
1 Update on the earthquake swarm in Geldingadalir – IMO
2 Intense earthquake swarm near Fagradalsfjall, Iceland – The Watchers
Featured image credit: IMO, Copernicus EU. Processed by Michelle Parks
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