Yesterday (24-April-2021) an earthquake swarm took place in Krýsuvík volcano close to Kleifarvatn lake. The largest earthquake had a magnitude of Mw3,1 and the second largest earthquake had a magnitude of Mw3,0. Both earthquakes where felt in Reykjavík area and other nearby areas. This activity is closer to Reykjavík then earlier earthquake swarms.
This earthquake activity is not connected to the eruption in Fagradalsfjall mountain. That however doesn’t rule out that magma might be the reason why this earthquake activity is happening. Currently the earthquake activity is too low for this to be a start of a second eruption. It is impossible to know if this is going to develop into anything more serious at the writing of this article. There needs to be a lot more earthquake activity in this location before an eruption starts, even if an eruption might not start with a lot of earthquake activity as was seen when the eruption in Fagradalsfjall mountain started. This is based on assumptions that might be wrong but only time is going to show what happens in this area.