Greek civil protection authorities have declared a state of emergency on Santorini after hundreds of undersea earthquakes shook the resort island for nearly a week.

The emergency measures were declared by the island’s town hall hours after seismologists recorded a 5.2-magnitude earthquake – the most powerful tremor to be felt on Santorini since the first of an estimated 7,700 temblors were registered last week.

The measures, under which the army is expected to take a more active role in crisis management, will be in effect until 3 March when the Christian Orthodox nation marks the beginning of Lent.