The Greek island of Santorini is facing a crisis after a powerful 5.2-magnitude earthquake struck on Wednesday evening. This follows an alarming series of tremors, with experts recording over 6,000 quakes in the Aegean Sea since January 26.

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 was declared on Santorini Thursday after a magnitude 5.2 earthquake shook the Greek island late Wednesday. The tremor is the latest — and strongest — in a series of quakes that have struck the island since last week,