Residents have been warned to avoid indoor gatherings, check escape routes, stay away from cliffs and to drain swimming pools to reduce potential structural damage to buildings in the event of a large earthquake.

Seismic activity near Greek island has prompted evacuations to the mainland, but scientists cannot predict whether these earthquakes will get worse.

Greece’s tourist island of Santorini on Sunday braced for the prospect of more tremors after more than 200 small earthquakes shook the site of one of the largest volcanic eruptions in recorded history.