Emergency services were deployed in readiness and schools were closed after more than 200 temblors struck in the Aegean, near Santorini, within 48 hours.

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 remains on high alert as earthquake tremors persist for the fourth consecutive day, prompting the authorities to close schools and arrange additional flights to facilitate evacuations.