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,

Aegean Airlines has put on more flights to help tourists leave the island, as people are advised to avoid popular port towns

Tremors of up to 4.9 in magnitude were recorded north-east of the island on Monday, while recent days have seen quakes of 4.3 and 3.9 magnitude reported nearby. Santorini is on what is known as the Hellenic Volcanic Arc - a chain of volcanic islands created by plate tectonics - but the last major eruption was in the 1950s.

The strongest earthquake recorded was magnitude 4.6 at 3:55 p.m. Sunday, at a depth of 14 kilometers (9 miles), the Athens Geodynamic Institute said.

The Greek island of Santorini is being rattled by dozens of tremors, prompting authorities to close schools and airlines to announce additional flights on Monday to help people leave the popular tourist destination.

Tremors between Santorini and Amorgos since Friday led to school closures in Santorini, Ios, Amorgos, and Anafi, as authorities monitor the seismic activity.