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

An accumulation of weak to moderate earthquakes has been recorded around the Greek island of Santorini since 24 January. The seismic activity is concentrated in the area between the islands of Santorini and Amorgos,

Greece has declared a state of emergency on Santorini because of the hundreds of undersea earthquakes that have shaken the resort island for nearly a week