Ancient volcanic eruption brought population collapse and coastal growth to Japan
Population models suggest the Kikai-Akahoya eruption brought severe regional decline alongside continued growth on some northern coastlines. Southern Kyushu was already undergoing demographic and settlement changes before the eruption about 7,300 years ago. Migration, maritime resources and new social connections may explain recovery, but these remain interpretations requiring further archaeological tests. Some communities declined sharply after one of the largest volcanic eruptions of the Holocene, while others continued growing surprisingly close to the devastation. A reconstruction of prehistoric Japan’s population patterns suggests that catastrophe produced no single outcome. Conditions before the eruption, access to recovering ecosystems and possible movements of survivors all shaped what followed. The evidence complicates an archaeological debate often framed as either total collapse or straightforward survival. The international study, reported in Science Advances, examines the Kikai-Akahoya eruption about 7,300 years ago. Enrico Crema of Cambridge University led the analysis, with Lund University archaeologist Peter Jordan as senior author. Their team modeled changes in archaeological radiocarbon dates across Japan. They then compared the reconstructed trends with pottery, tools, settlement evidence and volcanic …








