Repeated earthquakes are rattling Greece’s volcanic island of Santorini. The quakes are prompting authorities to dispatch rescuers with tents, a sniffer dog and drones and to shut down schools on four islands.

Santorini's earthquakes are intensifying as a rare earthquake swarm continues to rattle the Mediterranean's Aegean Sea. The earthquakes are probably caused by faults rather than volcanic activity.

The popular Greek holiday island of Santorini is taking emergency measures in response to intense seismic activity.

Hundreds of people scrambled to leave the Greek island of Santorini by ferry Monday after an increase in seismic activity raised concerns about a potential powerful earthquake. (AP Video by Lefteris P

Schools were closed and emergency crews deployed on the volcanic Greek island of Santorini on Monday after a spike in seismic activity raised

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.

Greek authorities have warned of an increase in seismic activity around the Aegean tourist island of Santorini, advising people to avoid four ports, empty their pools, refrain from gathering in indoor spaces and shut schools on Monday.

Schools have been shut and public gatherings are being discouraged on the Greek island of Santorini as local authorities put the popular tourist spot on high alert for a big earthquake, following scores of small temblors over the last two days.

The mayor of Santorini has called for calm after the island was struck by “intense” tremors for a fourth day in a row.

Greek Prime Minister Kyriakos Mitsotakis appealed for calm Monday after a wave of seismic tremors hit the tourist island of Santorini, prompting concern among locals and hundreds of departures.