Some seven thousand three hundred years ago, a submerged volcano off the southern shore of Kyushu tore open the land and sea around it, and the people who had built their lives there were scattered like seed on the wind. A team led by Enrico Crema and Peter Jordan, reading the faint signatures left in radiocarbon dates, pottery and ash, now shows that this ancient disaster did not fall evenly on all who lived through it. In the south, communities thinned and some places were left empty, while along the northern coast people kept gathering, fishing and multiplying. It is a reminder that catastr
How Jōmon communities weathered the Kikai-Akahoya eruption: coast, migration and shifting ties
Many people died and southern and central Kyushu communities declined sharply or were displaced, with some areas abandoned.
Some communities changed where they lived, how they got food and whom they relied on.
Mark
Why does this eruption matter beyond the obvious scale?
Mimi
Because the study shows it wasn't one outcome. Southern and central Kyushu declined sharply, while northern Kyushu's coast and parts of northern Honshu kept growing.
Mark
What explains the growth in the north?
Mimi
Researchers point to the sea. Coastal waters may have recovered faster than inland areas, and harpoon points spread across northern Kyushu after the eruption.
Luke
Careful with the verb, though. "May have recovered" is a hypothesis. The harpoons support more marine hunting, but they don't prove the sea was the cause.
Mark
And the migration idea?
Mimi
Slit stone earrings, once found in southern Kyushu, turn up on the northern coast afterward. It hints at connections between groups.
Luke
Hints is the right word. The earrings could have been carried by refugees, traded, or exchanged as relationships formed. The authors say they don't prove migration.
Mark
Was the south's decline all the eruption's doing?
Mimi
Not entirely. Numbers there had already begun falling before it, and the big settlements were gone.
Luke
Which makes the eruption's exact share hard to separate. Also, the population figures come from radiocarbon dates, a proxy for people, not a headcount.
Mimi
Still, the pattern across 750 years either side is what gives the finding weight.
El Pulso
- A caldera off Kyushu's southern coast erupted in a series of blasts that culminated in collapse, sending pyroclastic flows and ash across the land.
- Southern and central Kyushu communities lost people sharply, and some settlements may have been abandoned altogether.
- Hunters and gatherers who had already scattered into small camps were forced to find new food, new partners and new ground.
- Northern coastal populations kept growing, drawing on fish and sea resources that recovered faster than the inland forests and soils.
- Migration northward and a spreading taste for marine hunting now mark a changed Japan that took shape in the eruption's wake.
Some seven thousand three hundred years ago, a submerged volcano off the southern shore of Kyushu tore open the land and sea around it, and the people who had built their lives there were scattered like seed on the wind. A team led by Enrico Crema and Peter Jordan, reading the faint signatures left in radiocarbon dates, pottery and ash, now shows that this ancient disaster did not fall evenly on all who lived through it. In the south, communities thinned and some places were left empty, while along the northern coast people kept gathering, fishing and multiplying. It is a reminder that catastrophe rarely writes one story, and that the sea and the road north may have quietly decided which lives carried on.
About 7,300 years ago, a volcano beneath the sea off southern Japan erupted with a force few events in the last twelve thousand years could match. It was not one blast but a sequence of growing explosions, until the mountain collapsed into a basin roughly nineteen by seventeen kilometres wide, most of it now under water. Ash buried the southern lands, pyroclastic flows swept across the coast, and earthquakes, tsunamis and choking fallout followed. The people in its path were Jōmon hunters, fishers and gatherers who had already left behind their large southern settlements and lived in small, mobile groups. They were used to moving, but this disaster destroyed the resources they depended on and tore apart the ties between their groups.
A new study in Science Advances, led by Enrico Crema of the University of Cambridge and Peter Jordan of Lund University, traced what came next by reading radiocarbon dates across the 750 years before and after the eruption. The picture that emerged was not one of uniform collapse. In southern and central Kyushu, population fell sharply, and some areas were likely emptied entirely, though numbers there had begun slipping even before the catastrophe. Further north, along Kyushu's coast and into parts of northern Honshu, people kept growing. Even in the north, ash reached communities far from the worst destruction, and some people likely died there too, with recovery coming only later.
The sea may explain much of the difference. Inland forests, rivers and soils stayed poisoned by ash for years, while ocean currents carried away contaminated water and volcanic material, letting coastal waters recover sooner. Fish and shellfish became a steadier food, and the archaeological record shows stone harpoon points spreading across northern Kyushu, a sign of more fishing and perhaps deeper-water hunting. Slit stone earrings, once confined to the south, began appearing along the northern shore, hinting that people had travelled north, whether fleeing, trading or forging new bonds. As Crema put it, the disaster claimed many lives, but the survivors built new relationships and found ways to live under changed conditions. Those adaptations, the researchers suggest, helped shape the people and culture of prehistoric Japan for generations to come.
About 7,300 years ago, a volcano in the sea off southern Japan erupted with a force matched by few events in the last 12,000 years. Ash buried parts of the south, and the people living there were driven from their homes. A new study in Science Advances asks what happened to them, and finds that the answer depends heavily on where they lived.
The source was the Kikai Caldera, a largely submerged volcano about 30 kilometres off the southern coast of Kyushu, Japan's third largest island. The Kikai-Akahoya eruption was not a single blast. Geological evidence suggests a series of increasingly powerful eruptions, separated by quieter periods. Eventually the caldera collapsed, leaving a depression roughly 19 by 17 kilometres, most of it under the sea. Pyroclastic flows of superheated gas, ash and rock crossed the surrounding land, and earthquakes, tsunamis and heavy ashfall added to the destruction.
The people in its path belonged to the Jōmon culture, who hunted, fished and gathered plants. Archaeological evidence shows that the large settlements once found in southern Kyushu had already vanished before the eruption. People were living in smaller groups and moving between temporary camps to follow food. They were used to mobility, but the researchers note the eruption would still have made life much harder, destroying resources and disrupting ties between groups.
The international team was led by Enrico Crema of the University of Cambridge and Peter Jordan of Lund University. They examined the archaeological record for the 750 years before and after the eruption, using radiocarbon dates from sites to estimate population change. Larger populations tend to leave more datable material, which reveals broad patterns of growth and decline. The team compared those results with pottery, stone tools, settlement remains and volcanic ash deposits.
In southern and central Kyushu, the evidence points to a substantial population decline after the eruption, and some areas may have been abandoned altogether. Numbers in the south had, however, already begun to fall before the catastrophe. Further north the picture reversed. Populations along Kyushu's northern coast kept growing despite the eruption, and similar growth appears in parts of northern Honshu.
Northern Kyushu was not untouched. Ash deposits show the eruption affected communities well beyond the zones of greatest destruction, and some people there may have died, with recovery or expansion coming only in later years. In some regions, populations that had been rising before the disaster stagnated or declined. The researchers say this suggests the eruption may have affected population growth across a much wider area than previously thought. Possible causes include ash contaminating food and water, fine airborne particles causing breathing difficulties, and high fluoride concentrations released during the volcanic activity. The eruption may also have affected the climate and disrupted deer and wild boar, important food for Jōmon hunters.
The sea may help explain why the northern coast fared differently. Forests, rivers and inland soils may have stayed affected by ash for years, while coastal waters could have recovered faster, as ocean currents dispersed contaminated water and volcanic material. That would have made fish and other seafood a more dependable food source. The archaeology fits: after the eruption, stone harpoon points became more common and appeared across a wider area of northern Kyushu, suggesting more fishing and marine hunting, possibly farther offshore. The turn toward marine resources had begun before the eruption, but the disaster may have pushed more people to adopt it.
Migration may be part of the story too. People fleeing the devastated south and inland areas may have travelled north, joining existing communities or founding new ones. One clue is slit stone earrings, previously found in southern Kyushu, which began appearing along the northern coastline after the eruption. They do not prove migration; they might have been carried by people leaving home, traded, or shared as new relationships formed. "The disaster claimed many lives," Crema said, "but the survivors forged new social relationships and found ways to live under changed circumstances."
The study portrays an aftermath more complex than simple collapse: some communities changed where they lived, how they got food and whom they relied on. The researchers say those adaptations may have shaped the population and cultural landscape of prehistoric Japan for generations.
Citas Notables
The disaster claimed many lives, but the survivors forged new social relationships and found ways to live under changed circumstances.— Enrico Crema, University of Cambridge
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