A Volcano Buries a Bronze Age Town on Thera

During the second millennium BC, the volcanic island of Thera in the southern Aegean Sea underwent one of the most powerful explosive events in human history. Geological reconstructions indicate that the volcanic system had repeatedly erupted and collapsed over hundreds of thousands of years, forming a circular, seawater-filled caldera ringed by islands. The Late Bronze Age cataclysm began from a vent within this ancient caldera, shattering the pre-existing topography. Marine surveys conducted between 2015 and 2019 estimated that the total volume of expelled dense-rock equivalent material reached between 28 and 41 cubic kilometers, generating plumes that penetrated into the stratosphere.

The eruption unfolded across four primary phases following an initial, minor scattering of ash. Before the major paroxysm, preliminary tremors and light tephra falls appear to have alerted the inhabitants of the thriving settlement at Akrotiri. Because archaeological excavations have uncovered no human remains within the town, scholars conclude that the local population evacuated the settlement in advance of the full disaster. The initial major phase deposited up to seven meters of pumice and ash across the immediate landscape, burying standing structures while leaving many of them structurally intact beneath the debris.