Earthquakes rattled Greece's volcanic island of Santorini every few minutes through the night and into Wednesday as authorities bolstered their emergency plans in case the hundreds of temblors over the past few days are a harbinger of a larger quake to come.

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.

Santorini, often called Greece’s "Instagram Island," is famous for its whitewashed buildings and breathtaking caldera, a volcanic crater created by one of the largest known eruptions around 3,600 years ago.