A strong earthquake has been recorded between the Greek islands of Amorgos and Santorini, after days of consecutive tremors in the area. More than 11,000 people have already left Santorini with around 7,000 departing by ferry and 4,000 people leaving by air.

Earthquakes have continued to rattle Greece’s volcanic island of Santorini every few minutes through the night and into Wednesday. Authorities have bolstered their emergency plans in case the hundreds of tremors over the past few days are a harbinger of a larger quake to come.