A state of emergency for Santorini has been declared for almost a month as more earthquakes struck the ocean around the Greek island.
More than 12,000 people are reported to have evacuated by air and ferry as authorities reported that earthquakes are being recorded on minute-by-minute intervals.
Several more undersea quakes struck close to the island of just hours after civil protection authorities in Greece announced the state of emergency would be in place until March 3.
Santorini has faced seismic activity this week with thousands of earthquakes recorded since Sunday.
A 4.6 magnitude quake was recorded on Thursday evening, followed by one at 4.2 magnitude about two hours later.
Seismologists recorded a 5.2 magnitude earthquake on Wednesday – the most powerful since the first of an estimated 7,700 tremors were registered last week.
The majority of residents have fled for the mainland, including as many as 2,700 in two days as Aegean Airlines laid on special flights to Athens in addition to those escaping by ferry.
Authorities have warned of a high landslide risk, and have shut schools, dispatched rescuers, and advised residents to avoid ports and indoor gatherings.
No injuries have been reported to date, with no major damage on the island.
Prime minister Kyriakos Mitsotakis is expected to visit Santorini today (Friday), highlighting the seriousness of the situation.
A warning of increased seismic activity in Santorini was issued in a Foreign Office travel advisory on Sunday for the Aegean island and its smaller neighbours of Anafi, Ios and Amorgos, following more than 200 tremors registered in the area last weekend.