Today (21. December 2022) an earthquake with magnitude of Mw3,4 took place in Krýsuvík-Trölladyngja volcano. This earthquake is because of inflation in Fagradalsfjall volcano. This possibly means that the inflation in Fagradalsfjall volcano is reaching critical point and might result in a eruption soon, when that point is reached is difficult to know.
This is a increase in earthquake activity in this area after the August 2022 eruption in Fagradalsfjall volcano. This earthquake was felt in Reykjavík and other nearby area. This earthquake activity is going to move around this area until an eruption happens in Fagradalsfjall volcano. An eruption in Krýsuvík-Trölladyngja might happen but looks unlikely at this point.