"Quakes caused by magma intrusion"
The civil protection agency met today to discuss the situation and there was also a coordination meeting among stakeholder agencies including Grindavíkurbær municipality, Suðurnes police, the state police civil protection department, HS Orka energy company, and others.
A statement following the meeting said that monitoring information from the Met Office has been analysed and that decisions on preparedness and response measures will be based on that information.
The quakes today started smaller, but they are still very numerous. Two significant quakes shook the Reykjanes peninsula within minutes of each other shortly after 23.00 tonight. A third, even larger, followed at around 23.30. That quake was of Magnitude 4.8 and reportedly shook ceiling tiles loose inside the Smáralind shopping centre.
Over ten thousand have been recorded since the swarm began -- including the largest, of Magnitude 5.5, three kilometres northeast of Grindavík on Sunday evening.
Some residents in Grindavík say it was the worst earthquake they can remember. Some have packed bags and are ready to leave at short notice, if necessary.
Grindavík mayor Fannar Jónasson says it was certainly the hardest jold the town has experienced since before the earthquake swarms began at the start of 2020, which culminated in a volcanic eruption last year.
Scientists agree the earthquake swarm now closely resembles that which led to the Fagradalsfjall eruption last year and that the earthquakes are highly likely being caused by a magma intrusion. Geophysics professor Magnús Tumi Guðmundsson told RÚV today that another eruption is likely and that it would problably occur in the middle of the peninsula, further north than last year's and slightly further away from inhabited areas.