Earthquakes rattled Greece’s volcanic island of Santorini every few minutes through the night and into Wednesday as authorities bolstered their emergency plans in case the hundreds of temblors over the past few days are a harbinger of a larger quake to come.

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

Thousands of people have fled the Greek island of Santorini as the holiday hotspot experiences what seismologists hope is a "seismic swarm".