A fresh series of quakes hit the Greek island of Santorini early on Thursday, part of an unprecedented seismic wave that has baffled scientists and led to a mass exodus of residents. Schools on more than a dozen islands in the Cyclades island group in the Aegean Sea have been shut as a precaution until Friday,

Greece is preparing for any scenario but experts are optimistic about the tremors that triggered an exodus of residents and visitors from the Aegean Sea island of Santorini.

Experts say the Greek island of Santorini has been hit by more than 1,000 earthquakes, but they're not linked to the region's active volcanoes.

A new earthquake swarm rattled Santorini early Thursday, adding to an unprecedented seismic wave that has puzzled scientists and driven a mass exodus