Scientists have detected several thousand earthquakes, the vast majority of them with small magnitudes, in just over two weeks near Greece’s volcanic island of Santorini.

Residents on the popular island of Santorini have experienced thousands of earthquakes this month while researchers have revealed a new magma chamber growing underneath the Kolumbo submarine volcano.

The popular Greek tourist island of Santorini has experienced thousands of near-constant earthquakes since Jan. 25, prompting more than 13,000 of the island’s 15,500 residents to leave the island, according to The New York Times.