Scientists discover a surprising twist in Japan's 7,300-year-old volcanic apocalypse
A catastrophic volcanic eruption 7,300 years ago devastated Japan, but new research reveals that its impact on prehistoric populations was far more complex than previously believed. While some communities disappeared or declined, others unexpectedly flourished as survivors migrated, adapted, and found new ways to thrive.
Key points
- A Lund University-led team studied how the Kikai-Akahoya eruption changed population patterns across Japan about 7,300 years ago.
- Northern Kyushu's population kept growing through the disaster, possibly boosted by people fleeing the hardest-hit areas.
- Some distant regions saw growth stall or reverse after the eruption, an effect not previously recognized.
A massive volcanic eruption that struck Japan about 7,300 years ago had a far more complex effect on prehistoric communities than scientists once believed, according to an international research team led by Lund University. The Kikai-Akahoya volcano erupted beneath the sea, and the researchers found a mix of population decline, migration, adaptation and growth rather than outright destruction or survival.
The study examined how the eruption changed population patterns among Jomon communities, who depended on hunting and gathering. Senior author Peter Jordan, a professor of archaeology at Lund University, said the eruption exploded from the seabed with little warning, hitting the islands with earthquakes and tsunamis and covering the landscape with meters of volcanic ash.
Differing regional responses
In southern Kyushu, Jomon populations had already been shrinking well before the eruption, and relatively few people remained, the article states. Northern Kyushu followed a different path: its population had been rising before the eruption and continued to grow through and after it, despite lasting damage to ecosystems. The researchers suggest people fleeing the worst-affected regions may have contributed to that growth.
Evidence also indicates survivors who had lived inland moved toward the northern coast, where marine ecosystems recovered relatively quickly and provided food. The researchers also found population changes in parts of Japan much farther from the eruption, where growth stalled or reversed afterward.
The disaster caused major loss of life. However, survivors migrated, forged new social relations, innovated new kinds of economy
— Enrico Crema
What the researchers concluded
The team offered several possible explanations for the distant effects, including temporary climate disruptions, severe tooth wear among deer and wild boar, and other volcanic effects on health and living conditions. Lead author Enrico Crema, a professor at Cambridge University, said survivors migrated, formed new social relations and found creative ways to thrive after the disaster.
Jordan said the study deepens understanding of how cultures cope with sudden shocks, adding that even in the most impossible situations, survivors have choices, however limited.
