Schools were closed and emergency crews deployed on the volcanic Greek island of Santorini on Monday after a spike in seismic activity raised concerns about a potentially powerful earthquake.Precautions were also ordered on several nearby Aegean Sea islands — all popular summer vacation destinations — after more than 200 undersea earthquakes were recorded in the area over the past three days.

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.

Santorini is on high alert following over 200 undersea earthquakes, prompting authorities to close schools and deploy emergency crews. Though the quakes are not linked to its volcano, the increasing seismic activity is concerning,

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.

Despite dozens of minor earthquakes in recent days, Greek scientists have ruled out a massive earthquake hitting Greece's Santorini island.

More than 200 tremors have been registered since Friday between the volcanic islands of Santorini and Amorgos, the civil protection ministry said in a statement on Sunday, citing experts tasked with assessing earthquake risks and monitoring Greece’s volcanic arc.

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.

Greek officials are warning those on the popular tourist island destination of Santorini to stay alert in the coming days due to increasing seismic activity which could mean a strong earthquake is possible.