Thousands of people are fleeing the Greek island of Santorini as increased seismic activity spurs fears of a more powerful earthquake at the site of one of the largest volcanic eruptions in history.

Greece lies in a highly seismically active part of the world, and earthquakes are frequent. The vast majority cause no injuries and little or no damage, but the country has also seen deadly quakes. Earthquakes can't be predicted, but authorities are taking measures as a precaution.

More Greek islands closed schools Tuesday as hundreds of earthquakes ratted the Aegean Sea, while a handful of hardy tourists enjoyed having Santorini’s stunning views to themselves