The Icelandic town of Grindavik, population 3,300, was evacuated Friday night amid fears of a volcanic eruption.
The Icelandic Met Office said the likelihood of an eruption was “significant”, with some 900 earthquakes detected in the region since midnight today. Similar numbers had been detected in recent days.
It said satellite radar showed vertical ground displacement of up to 1 metre in western Grindavík, caused by a 15km-long magma intrusion between 2km and 5km underground.
Three mass care shelters have been set up in Reykjavik, 42km to the northeast.