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 over the past few days are a harbinger of a larger quake to come.

A 5.3 magnitude earthquake struck near Santorini, Greece, the latest in a series of temblors near the popular tourist destination.

Tourists continued to flee the Greek island of Santorini on Wednesday — a fourth consecutive day of exodus sparked by a series of earthquakes that have rattled the incredibly popular European vacation destination.