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 strongest earthquake recorded was magnitude 4.6 at 3:55 p.m. Sunday, at a depth of 14 kilometers (9 miles), the Athens Geodynamic Institute said.

NBC News’ Matt Bradley reports on the aftermath and public response to several days of near constant earthquakes around the tourist hotspot of Santorini, Greece.

Greek officials have declared a state of emergency, and tourists and locals have fled the tourist island of Santorini amid earthquakes in the past few days.