Residents of neighbouring Amorgos remain on high alert after Monday's tremors, which followed a moderate 5.0 magnitude earthquake between the islands on Sunday evening. The area has been rocked by seismic activity for the last two weeks,

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

A state of emergency has been declared in Santorini after the strongest earthquake was recorded in days of near-constant tremors, which have almost emptied the famous Greek tourist haven of visitors and residents.