Hundreds of people left Santorini on ferries and planes on Tuesday to reach safety in Athens as a series of quakes kept shaking the famous Greek tourist island.

The hundreds of earthquakes that have rattled Greek islands on the Aegean Sea are a “seismic swarm” and could continue for weeks before eventually diminishing, the Santorini mayor told The Associated Press on Tuesday — pausing to chuckle as new tremors shook items on his desk.