The Minoan eruption of Thera, also referred to as the Thera eruption or Santorini eruption, was a major catastrophic volcanic eruption with a Volcanic Explosivity Index (VEI) of 6 or 7 and a dense-rock equivalent (DRE) of , which is estimated to have occurred in the mid-second millennium BCE. The eruption was one of the largest volcanic events on Earth in recorded history. The eruption devastated the island of Thera (also called Santorini), including the Minoan settlement at Akrotiri, as well as devastating communities and agricultural areas on nearby islands and on the coast of Crete due to a related earthquake or tsunami.