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

Thousands of locals and travelers have evacuated the Greek island of Santorini amidst a spike in seismic activity.

Earthquakes are still rattling Greece’s volcanic island of Santorini every few minutes as authorities bolster their emergency plans in case the hundreds of temblors in recent days are a harbinger of a larger quake to come.