According to the automatic SIL system that IMO runs there was a ML3.9 magnitude earthquake about 18.3 km north of the island Grímsey, this earthquake happened at 09:00 UTC. The automatic depth was 14.7 km. This numbers are expected to be changed as the earthquake get reviewed by seismologist at Icelandic Met Office.
No damage is expected from this earthquake. But there is a good chance that it might have been felt in Grímsey Island.