The National Commissioner of the Icelandic Police and the District Commissioner of Police in North East Iceland have declared a Civil Protection Uncertainty phase due to seismic unrest on the ocean floor north of Iceland.
There was a 5.2 event in the ongoing earthquake swarm in the area north of Iceland close to Grímsey island. The area is known earthquake zone.
Uncertainty phase/level is characterized by an event which has already started and could lead to a threat to people, properties, communities or the environment. At this stage the collaboration and coordination between the Civil Protection Authorities and stakeholders begins. Monitoring, assessment, research and evaluation of the situation is increased. The event is defined and a hazard assessment is conducted regularly.
There is seldom advance warning of an earthquake. Therefore, it is important to take security measures ahead of time and to learn how to respond, more here https://www.almannavarnir.is/english/preventive-measures/earthquakes-duck-cover-hold/