The Greek island has a long history of earthquakes, but what is causing the recent series of quakes has scientists perplexed.

ATHENS, Greece — Greece’s government declared a state of emergency on Santorini on Thursday after hundreds of undersea earthquakes shook the resort island for nearly a week.

Experts say the Greek island of Santorini has been hit by more than 1,000 earthquakes, but they're not linked to the region's active volcanoes.

Repeated earthquakes are rattling Greece’s volcanic island of Santorini. Scientists say the quakes aren't related to a slight increase in volcanic activity that has also been registered recently.

A seismologist from the European-Mediterranean Seismological Centre has said it may take “weeks” to see how the ongoing earthquakes disrupting Santorini and other Greek islands evolve, warning that the disruption seen so far could amount to foreshocks ahead of a larger quake.

Greek officials have declared a state of emergency, and tourists and locals have fled the tourist island of Santorini amid earthquakes in the past few days.