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.

The threat of a more major earthquake seems to have subsided on the most visited of the Greek islands but experts disagree on the origin of the tremors that have caused 11,000 of the 15,000 permanent residents to flee.

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.