Multiple earthquakes are rattling Santorini, a volcanic island in Greece, prompting authorities to dispatch rescuers with tents, a sniffer dog and drones, and to shut schools on four islands. Residents have been warned to avoid indoor gatherings,

The region remains vulnerable to seismic hazards. Greece’s most powerful earthquake of the last century, the 7.7-magnitude Amorgos earthquake of 1956, triggered a tsunami that devastated parts of Amorgos and Santorini, resulting in significant damage and the loss of more than 50 lives.