Minoan eruption

The eruption occurred at the island of Thera, now Santorini, in the Aegean Sea. The Smithsonian Institution's Global Volcanism Program places the event about 3,600 years ago, around 1600 BCE, and identifies it as the event that formed Santorini's youngest caldera. The highly explosive eruption buried the settlement of Akrotiri and other sites under volcanic deposits. Geological reconstructions describe several stages, including an initial Plinian phase, later water-influenced explosions, pyroclastic flows and caldera collapse.

Ash and pumice deposits provide a marker layer studied across the eastern Mediterranean. Evidence also indicates a tsunami reached Crete: a survey at Malia found marine sand and other deposits attributed to inundation, locally extending as much as 400 metres inland. These effects are well documented, but how the eruption affected Minoan society beyond Thera is a more complex question; it should not be treated as a settled single cause for the later decline of Minoan centres.

The exact date is contested because archaeological chronologies and radiocarbon-based estimates do not always align. Tree-ring radiocarbon analyses published in 2018 found evidence compatible with a sixteenth-century BCE eruption. A 2023 study of an olive shrub buried in eruption deposits on nearby Therasia reported calibrated results that increase the probability of a mid-sixteenth-century BCE date. These are lines of evidence rather than a universally agreed exact year.