{"id":480018,"date":"2026-10-17T11:43:51","date_gmt":"2026-10-17T18:43:51","guid":{"rendered":"https:\/\/climatescience.press\/?p=480018"},"modified":"2026-10-17T11:43:53","modified_gmt":"2026-10-17T18:43:53","slug":"how-japans-largest-holocene-volcano-plunged-the-region-into-a-50-year-volcanic-winter","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=480018","title":{"rendered":"How Japan\u2019s Largest Holocene Volcano Plunged the Region into a 50-Year Volcanic Winter"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"485\" data-attachment-id=\"480019\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=480019\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-How-Japans-Largest-Holocene-Volcano-Plunged-the-Region-into-a-50-Year-Volcanic-Winter.jpg?fit=1168%2C784&amp;ssl=1\" data-orig-size=\"1168,784\" data-comments-opened=\"1\" data-image-meta=\"{&quot;credit&quot;:&quot;a86567cb-f36f-4144-80bc-703db3c9fcf1&quot;,&quot;caption&quot;:&quot;Signature: 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&quot;}\" data-image-title=\"0 How Japan\u2019s Largest Holocene Volcano Plunged the Region into a 50-Year Volcanic Winter\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Signature: 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&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-How-Japans-Largest-Holocene-Volcano-Plunged-the-Region-into-a-50-Year-Volcanic-Winter.jpg?fit=723%2C485&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-How-Japans-Largest-Holocene-Volcano-Plunged-the-Region-into-a-50-Year-Volcanic-Winter.jpg?resize=723%2C485&#038;ssl=1\" alt=\"A dramatic landscape depicting a volcanic eruption with a towering plume of smoke and ash rising above a desolate shore, surrounded by barren trees and a dark, stormy sky.\" class=\"wp-image-480019\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-How-Japans-Largest-Holocene-Volcano-Plunged-the-Region-into-a-50-Year-Volcanic-Winter.jpg?resize=1024%2C687&amp;ssl=1 1024w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-How-Japans-Largest-Holocene-Volcano-Plunged-the-Region-into-a-50-Year-Volcanic-Winter.jpg?resize=300%2C201&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-How-Japans-Largest-Holocene-Volcano-Plunged-the-Region-into-a-50-Year-Volcanic-Winter.jpg?resize=768%2C516&amp;ssl=1 768w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-How-Japans-Largest-Holocene-Volcano-Plunged-the-Region-into-a-50-Year-Volcanic-Winter.jpg?resize=640%2C430&amp;ssl=1 640w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/0-How-Japans-Largest-Holocene-Volcano-Plunged-the-Region-into-a-50-Year-Volcanic-Winter.jpg?w=1168&amp;ssl=1 1168w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><figcaption class=\"wp-element-caption\">AI generated by Grok<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The article by Peter Jordan (Professor of Archaeology at Lund University), published in <em>The Conversation<\/em> on 14 October 2026, examines how prehistoric J\u014dmon hunter- gatherer communities in Japan responded to the massive Kikai- Akahoya volcanic eruption about 7,300 years ago, and what that reveals about human resilience amid modern climate and environmental shocks.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>The disaster<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The Kikai- Akahoya eruption was an enormous underwater blast, the largest volcanic event since the end of the last ice age. It struck without warning, triggering <strong>powerful earthquakes and massive tsunamis across the Japanese islands<\/strong>. Ash clouds blanketed the landscape in metre- deep toxic layers, choking coastlines, destroying rivers, and killing forests for decades (centuries near the epicentre). This <strong>destroyed local food systems<\/strong> that the J\u014dmon people depended on for wild plants, nuts, game, and other resources.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Moving beyond \u201capocalypse vs. continuity\u201d<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Archaeologists had long debated two extremes:<\/strong> total societal collapse and the abrupt end of human life in affected areas, or seamless continuity with people simply enduring. New research (led by Enrico Crema of the University of Cambridge, with Jordan as senior author, published in <em>Science Advances<\/em>) tracked regional population levels before and after the eruption using detailed archaeological records. The picture that emerged was far more complex.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Key findings include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Populations nearest the epicentre in southern Kyushu were already declining before the eruption; the disaster compounded existing vulnerabilities among highly mobile forager groups.<\/li>\n\n\n\n<li>In some areas relatively close to the destruction (notably northern Kyushu), populations actually <em>boomed<\/em> afterward. Survivors migrated from the worst- hit zones into safer regions.<\/li>\n\n\n\n<li>Inland groups rapidly shifted to coastal areas, where marine ecosystems recovered faster, reinventing their economies around sea resources.<\/li>\n\n\n\n<li>Paradoxically, more distant populations (expected to be safer) stagnated or declined, likely due to a \u201cvolcanic winter\u201d that reduced sunlight, plant growth, and animal numbers.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Lessons for resilience today<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Jordan\u2019s core argument is that true resilience is not about rigidly maintaining the status quo or pretending nothing changed. The eruption did not produce uniform collapse or unbroken continuity. Instead, it triggered a dynamic mix of migration, adaptation, recovery, and innovation shaped by both environmental conditions and human decisions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Survivors actively chose to move, built new social networks, developed new economic strategies, and found ways to thrive in a permanently altered landscape, even without modern warning systems, aid, or infrastructure. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>This underscores the vital role of human agency:<\/strong> outcomes after catastrophe are not predetermined solely by the scale of the shock, but emerge from pre-existing conditions, environmental recovery rates, mobility, and the capacity of communities to reorganize and collaborate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The J\u014dmon case offers a more flexible, realistic vision of resilience for contemporary societies facing climate shocks and other disasters. Survival is not a fixed state; the future will depend heavily on collective social actions and decision-making alongside environmental factors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The original article is available at <a href=\"https:\/\/theconversation.com\/what-an-ancient-volcanic-eruption-teaches-us-about-resilience-today-294258\" target=\"_blank\" rel=\"noopener\">The Conversation<\/a>. Related coverage from Lund University, the University of Cambridge, and other outlets expands on the population patterns and the broader <strong>\u201cSurviving the Apocalypse\u201d<\/strong> research project.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"400\" data-attachment-id=\"480028\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=480028\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?fit=2880%2C1595&amp;ssl=1\" data-orig-size=\"2880,1595\" data-comments-opened=\"1\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?fit=723%2C400&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?resize=723%2C400&#038;ssl=1\" alt=\"Map of Japan showing average tephra deposit thickness in millimeters, featuring the Kikai caldera indicated by a red triangle. The left panel displays a gradient scale for deposit thickness, while the right panel illustrates tephra thickness ranges with different color coding. Geographic coordinates are marked with latitude and longitude.\" class=\"wp-image-480028\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?resize=1024%2C567&amp;ssl=1 1024w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?resize=300%2C166&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?resize=768%2C425&amp;ssl=1 768w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?resize=1536%2C851&amp;ssl=1 1536w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?resize=2048%2C1134&amp;ssl=1 2048w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?resize=640%2C354&amp;ssl=1 640w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?w=1446&amp;ssl=1 1446w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-117.png?w=2169&amp;ssl=1 2169w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><figcaption class=\"wp-element-caption\">Map of the study area. Credit: <em>Science Advances<\/em> (2026). DOI: 10.1126\/sciadv.aeh7197<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The Kikai- Akahoya (K- Ah) eruption (~7,300 years ago \/ ~5,300 BCE)<\/strong> was one of the largest volcanic events of the Holocene (<strong>Volcanic Explosivity Index VEI 7<\/strong>; bulk tephra volume estimated at 332- 457 km\u00b3). It originated from the largely submarine Kikai caldera south of Kyushu, Japan. While its most dramatic immediate effects were local (pyroclastic flows, tsunamis, earthquakes, and thick ash deposits), it also produced measurable regional- to-hemispheric climate impacts lasting decades.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Primary climate forcing mechanism<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Large explosive eruptions inject <strong>sulfur dioxide (SO\u2082) into the stratosphere<\/strong>, where it converts to sulfate aerosols. These aerosols reflect incoming solar radiation, increasing <strong>Earth\u2019s albedo<\/strong> and causing surface cooling (a \u201cvolcanic winter\u201d effect). <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The K- Ah event ranks among the highest sulfur- injection eruptions of the Holocene. Ice- core records show prominent sulfate spikes around 7,180- 7,175 years BP in both Greenland and Antarctica, with estimated sulfur loading far exceeding that of the 1815 Tambora eruption (often cited as &gt;75 Tg S, potentially several times Tambora\u2019s output).<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Documented temperature and hydroclimate responses<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Proxy evidence indicates multi- decadal cooling rather than a purely short- lived (1- 3 year) aerosol effect:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Stalagmite record from Minami- Daito Island (Northwest Pacific, ~600 km from the caldera):<\/strong> A clear cold- wet anomaly peaking at ~7.13 kyr BP. Temperature anomaly reached a minimum of approximately \u22123.1 \u00b1 0.6 \u00b0C, with reduced \u03b4\u00b9\u2078O and \u03b4D in fluid inclusions indicating intensified regional rainfall. The cooling phase lasted roughly 50 years and was amplified relative to other mid-Holocene volcanic clusters.<\/li>\n\n\n\n<li><strong>Northern Hemisphere mean temperature:<\/strong> Modeling and multi-proxy analyses linked to this event (or closely associated clusters) suggest cooling of up to ~1.6 \u00b0C lasting about 50 years, sustained by ocean\u2013 sea- ice feedback after the initial aerosol forcing.<a href=\"https:\/\/www.researchgate.net\/publication\/388923424_Multidecadal_hydroclimate_responses_to_volcanic_forcing_in_the_Mid-Holocene\" target=\"_blank\" rel=\"noopener\">\u2060<\/a><\/li>\n\n\n\n<li><strong>Marine sediments near Okinawa:<\/strong> Sea- surface temperature (SST) drops of ~3- 5 \u00b0C (alkenone and TEX\u2088\u2086 proxies) spanning roughly 7.5- 6.6 or 7.4- 6.9 kyr BP, consistent with the eruption timing (higher values in some proxies may partly reflect non- temperature influences).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These signals appear as an amplification of multi- decadal climate variability rather than an isolated extreme event. Clusters of large mid- Holocene eruptions (including K-Ah) tend to coincide with the onset or intensification of cooling phases, potentially via Atlantic- Pacific teleconnections (e.g., influences on Atlantic Multidecadal Variability).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Spatial scale and ecological consequences<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Near- field (southern and central Kyushu):<\/strong> Direct ash blanketing (meters thick near the source, tens of cm farther afield) destroyed forests for centuries, choked rivers and coastlines, and caused long- term terrestrial ecosystem collapse. Climate cooling compounded these effects but was secondary to physical ash deposition.<\/li>\n\n\n\n<li><strong>Regional and East Asian:<\/strong> Ash fallout extended across much of Japan, parts of Korea, and beyond. Reduced sunlight and cooler and wetter conditions likely lowered plant productivity and affected animal populations (e.g., possible accelerated tooth wear in deer and wild boar from ash-contaminated forage).<\/li>\n\n\n\n<li><strong>Hemispheric and distant Japan:<\/strong> The 2026 demographic study of J\u014dmon populations noted stagnation or decline in areas far from the volcano, attributing this in part to short- term climate disruption (volcanic winter reducing plant growth and game availability). This matches the multi-decadal cooling signal.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Comparison and uncertainties<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Compared with <strong>other large Holocene eruptions (e.g., Tambora 1815, Samalas 1257, or even larger events like Toba)<\/strong>, K- Ah\u2019s climate footprint was substantial but not globally catastrophic on multi- century scales. The ~50- year duration exceeds pure aerosol lifetimes, pointing to amplifying feedback (ocean heat content, sea ice). <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Precise sulfur yield estimates and exact global mean temperature responses still carry uncertainties due to ice- core resolution, dating offsets, and model sensitivities. Local vegetation recovery took 500- 1,000 and more years in the heaviest ash zones, driven more by physical burial than climate alone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In summary, the K- Ah eruption produced a clear multi- decadal (\u224850- year) cold and wet anomaly across the Northwest Pacific and broader Northern Hemisphere cooling of order 1- 3 \u00b0C regionally, superimposed on longer- term Holocene variability. These climate effects, combined with direct ash impacts, contributed to the divergent demographic responses observed among J\u014dmon communities.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"723\" data-attachment-id=\"480043\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=480043\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?fit=960%2C960&amp;ssl=1\" data-orig-size=\"960,960\" data-comments-opened=\"1\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?fit=723%2C723&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?resize=723%2C723&#038;ssl=1\" alt=\"Map showing the distribution of Kikiai-Ah ash-fall deposits and Koya pyroclastic flow deposits around the Kikai Caldera, with depth measurements indicated.\" class=\"wp-image-480043\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?w=960&amp;ssl=1 960w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?resize=768%2C768&amp;ssl=1 768w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?resize=640%2C640&amp;ssl=1 640w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?resize=450%2C450&amp;ssl=1 450w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?resize=60%2C60&amp;ssl=1 60w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?resize=550%2C550&amp;ssl=1 550w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-118.png?resize=50%2C50&amp;ssl=1 50w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><figcaption class=\"wp-element-caption\">Map of Kikai- Akahoya(K- Ah) <a href=\"https:\/\/en.wikipedia.org\/wiki\/tephra\">tephra<\/a> around Japan, 7.3ka. <br><a href=\"https:\/\/en.wikipedia.org\/wiki\/Akahoya_eruption#\/media\/File:Kikai_K-Ah_tephra_7,3ka.svg\">Kikai K-Ah tephra 7,3ka &#8211; Akahoya eruption &#8211; Wikipedia<\/a><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"has-large-font-size wp-block-paragraph\"><strong>Divergent demographic responses to the Kikai- Akahoya volcanic catastrophe in mid- Holocene Japan<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>This is the peer- reviewed research paper underlying the <em>Conversation<\/em> article by Peter Jordan.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Abstract (key points)<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The study examines human demographic responses to one of the Holocene\u2019s largest volcanic eruptions, the Kikai- Akahoya (K- Ah) event ~7,300 years ago, which devastated East Asia. Archaeologists have long debated whether such massive environmental shocks caused societal collapse or cultural continuity, but few studies place these events in longer-term demographic trajectories.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Using statistical models applied to radiocarbon- date frequencies as population proxies, the authors infer the demographic and environmental impacts on J\u014dmon foraging communities across the Japanese archipelago. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Traditionally viewed as an <strong>apocalyptic \u201cforcing\u201d mechanism<\/strong> that redirected Japanese prehistory, the results instead reveal a more complex and contingent suite of outcomes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Major population collapse in regions immediately adjacent to the volcano.<\/li>\n\n\n\n<li>Population <em>increases<\/em> in some proximal areas after the catastrophe.<\/li>\n\n\n\n<li>Negative effects on some distal communities due to previously overlooked environmental consequences (e.g., volcanic winter impacts).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Core methods and findings<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The team developed Bayesian statistical models (including intrinsic conditional autoregressive \/ ICAR models) that account for spatial structure and use ash- fall thickness as a predictor variable. They compared regional population growth rates before the eruption (roughly 8000- 7250 cal BP) and after it (7250- 6500 cal BP), drawing on hundreds of radiocarbon dates from archaeological sites across Japan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Main regional patterns:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Southern and central Kyushu (closest to the epicentre):<\/strong> Severe decline and depopulation. Populations here were already trending downward before the eruption; the disaster hit a sparsely populated landscape used mainly by highly mobile groups. Some areas show an enduring cultural hiatus.<\/li>\n\n\n\n<li><strong>Northern Kyushu and certain coastal zones (still relatively proximal):<\/strong> Continued or accelerated growth despite heavy ecological damage. This is attributed in part to migration of<strong> \u201crefugees\u201d<\/strong> from the worst- hit southern areas. Inland survivors appear to have shifted toward northern coastlines, where marine ecosystems recovered faster, supporting economic adaptation focused on sea resources.<\/li>\n\n\n\n<li><strong>More distant parts of Japan:<\/strong> Pre- eruption growth often slowed, stagnated, or reversed after the event, pointing to wider impacts such as reduced plant and animal productivity from atmospheric ash and volcanic winter effects.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Overall, post- eruption growth rates declined across much of the archipelago, but the responses were highly divergent rather than uniform.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Broader implications<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The paper moves beyond the binary <strong>\u201capocalypse versus continuity\u201d debate<\/strong>. The K- Ah eruption triggered a mix of high local fatality, abandonment, migration, social reorganization, economic innovation, and recovery. Outcomes depended on pre- existing demographic conditions, local environmental recovery rates (especially marine vs. terrestrial), mobility, and human decision-making.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The authors emphasize that even in extreme circumstances, communities retained agency:<\/strong> they migrated, formed new networks, and adapted subsistence strategies. This offers a more nuanced archaeological perspective on resilience to sudden environmental catastrophe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note:<\/strong> The full text on <em>Science Advances<\/em> appears to be paywalled or access- restricted in some contexts (tool retrieval failed for the complete HTML\/PDF). Open excerpts, the abstract, supplementary materials (including a Japanese extended abstract), and institutional press releases from Cambridge, Lund, and others provide the details above. Supplementary materials are available at the journal site.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Journal:<\/strong> <a href=\"https:\/\/phys.org\/journals\/science-advances\/\">Science Advances<\/a>, <em>12<\/em>(42), eaeh7197<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>DOI:<\/strong> <a href=\"https:\/\/dx.doi.org\/10.1126\/sciadv.aeh7197\" target=\"_blank\" rel=\"noopener\">10.1126\/sciadv.aeh7197<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Provided: <\/strong><a href=\"https:\/\/phys.org\/partners\/the-conversation\/\">The Conversation<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Authors: <\/strong><a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.aeh7197?referrer=https%3A%2F%2Fphys.org%2F#con1\">Enrico R. Crema<\/a><a href=\"https:\/\/orcid.org\/0000-0001-6727-5138, Mitsuhiro Kuwahata\">, Mitsuhiro Kuwahata<\/a>, <a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.aeh7197?referrer=https%3A%2F%2Fphys.org%2F#con3\">Junzo Uchiyama<\/a>, <a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.aeh7197?referrer=https%3A%2F%2Fphys.org%2F#con4\">Ari Junno<\/a>, <a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.aeh7197?referrer=https%3A%2F%2Fphys.org%2F#con5\">Felix Riede<\/a><a href=\"https:\/\/orcid.org\/0000-0002-4879-7157, and Peter D. Jordan\">, and Peter D. Jordan <\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Published:<\/strong> 14 October 2026<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"723\" height=\"543\" data-attachment-id=\"480065\" data-permalink=\"https:\/\/climatescience.press\/?attachment_id=480065\" data-orig-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?fit=2880%2C2162&amp;ssl=1\" data-orig-size=\"2880,2162\" data-comments-opened=\"1\" data-image-title=\"image\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?fit=723%2C543&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?resize=723%2C543&#038;ssl=1\" alt=\"A landscape featuring a dark, layered soil wall with a reddish-orange stripe, surrounded by a barren, cracked ground with scattered remnants of plant roots and debris.\" class=\"wp-image-480065\" srcset=\"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?resize=1024%2C769&amp;ssl=1 1024w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?resize=300%2C225&amp;ssl=1 300w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?resize=768%2C577&amp;ssl=1 768w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?resize=1536%2C1153&amp;ssl=1 1536w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?resize=2048%2C1537&amp;ssl=1 2048w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?resize=640%2C480&amp;ssl=1 640w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?w=1446&amp;ssl=1 1446w, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/10\/image-119.png?w=2169&amp;ssl=1 2169w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><figcaption class=\"wp-element-caption\">K-Ah volcanic deposit in southern Kyushu. Credit: <em>Science Advances<\/em> (2026). DOI: 10.1126\/sciadv.aeh7197<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The article by Peter Jordan (Professor of Archaeology at Lund University), published in The Conversation on 14 October 2026, examines how prehistoric J\u014dmon hunter- gatherer communities in Japan responded to the massive Kikai- Akahoya volcanic eruption about 7,300 years ago, and what that reveals about human resilience amid modern climate and environmental shocks.<\/p>\n<p>The Kikai- Akahoya (K- Ah) eruption (~7,300 years ago \/ ~5,300 BCE) was one of the largest volcanic events of the Holocene (Volcanic Explosivity Index VEI 7; bulk tephra volume estimated at 332- 457 km\u00b3). It originated from the largely submarine Kikai caldera south of Kyushu, Japan. While its most dramatic immediate effects were local (pyroclastic flows, tsunamis, earthquakes, and thick ash deposits), it also produced measurable regional- to-hemispheric climate impacts lasting decades.<\/p>\n","protected":false},"author":121246920,"featured_media":480019,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"Discover how Japan's J\u014dmon communities adapted to the Kikai-Akahoya eruption, showcasing resilience in the face of climate shocks 7,300 years ago.","jetpack_seo_html_title":"Lessons from Japan\u2019s Kikai-Akahoya Eruption: Resilience Revealed","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[691846485,691844575,691827617,691846486,691846487,691843260,691826292,691818192,691846489,691846483,691846484,691834401,691844347,691846488],"class_list":["post-480018","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-apocalyptic-forcing-mechanism","tag-volcanic-winter","tag-climate-cooling","tag-destroyed-forests-for-centuries","tag-destroyed-local-food-systems","tag-earths-albedo","tag-ecosystem-collapse","tag-holocene","tag-ice-core-records-2","tag-kikai-akahoya-k-ah-eruption","tag-sea-surface-temperature-sst-3","tag-stratospheric-sulfate-aerosols","tag-sulfur-dioxide-so","tag-volcanic-explosivity-index-vei-7","fallback-thumbnail"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paxLW1-20Se","jetpack-related-posts":[{"id":442561,"url":"https:\/\/climatescience.press\/?p=442561","url_meta":{"origin":480018,"position":0},"title":"Kikai Caldera Refilling: Fresh Melt Re-Injecting into Giant Magma Reservoir 7,300 Years After Massive Eruption","author":"uwe.roland.gross","date":"05\/04\/2026","format":false,"excerpt":"A March 2026 study by Kobe University researchers (published in Communications Earth & Environment) confirms that a large magma reservoir beneath Japan's Kikai Caldera is refilling with new magma.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/05\/0-Kikai-Caldera-Refilling-Fresh-Melt-Re-Injecting-into-Giant-Magma-Reservoir-7300-Years-After-Massive-Eruption.jpg?fit=1168%2C784&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/05\/0-Kikai-Caldera-Refilling-Fresh-Melt-Re-Injecting-into-Giant-Magma-Reservoir-7300-Years-After-Massive-Eruption.jpg?fit=1168%2C784&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/05\/0-Kikai-Caldera-Refilling-Fresh-Melt-Re-Injecting-into-Giant-Magma-Reservoir-7300-Years-After-Massive-Eruption.jpg?fit=1168%2C784&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/05\/0-Kikai-Caldera-Refilling-Fresh-Melt-Re-Injecting-into-Giant-Magma-Reservoir-7300-Years-After-Massive-Eruption.jpg?fit=1168%2C784&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/05\/0-Kikai-Caldera-Refilling-Fresh-Melt-Re-Injecting-into-Giant-Magma-Reservoir-7300-Years-After-Massive-Eruption.jpg?fit=1168%2C784&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":459194,"url":"https:\/\/climatescience.press\/?p=459194","url_meta":{"origin":480018,"position":1},"title":"Volcanoes, Not Just Chance: Explosive Eruptions Drove Centuries of Holocene Cooling and Glacial Advances","author":"uwe.roland.gross","date":"07\/30\/2026","format":false,"excerpt":"Custers of large volcanic eruptions\u2014particularly in the Pacific Ring of Fire (which includes many subduction-zone volcanoes around the Pacific)\u2014have been linked in scientific studies to periods of sustained global or hemispheric cooling lasting decades to centuries. 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In that pivotal year, a landmark paper by Nobel laureate Luis Alvarez and his team shattered the paradigm of geological gradualism. Alvarez demonstrated that a massive asteroid impact \u2014 rather than incremental evolutionary shifts\u2026","rel":"","context":"In \"climate alarmism\"","block_context":{"text":"climate alarmism","link":"https:\/\/climatescience.press\/?tag=climate-alarmism"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/06\/0-ChatGPT-Catastrophism-is-in-Retreat-Across-Science.png?fit=1200%2C800&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/06\/0-ChatGPT-Catastrophism-is-in-Retreat-Across-Science.png?fit=1200%2C800&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/06\/0-ChatGPT-Catastrophism-is-in-Retreat-Across-Science.png?fit=1200%2C800&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/06\/0-ChatGPT-Catastrophism-is-in-Retreat-Across-Science.png?fit=1200%2C800&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2026\/06\/0-ChatGPT-Catastrophism-is-in-Retreat-Across-Science.png?fit=1200%2C800&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":291020,"url":"https:\/\/climatescience.press\/?p=291020","url_meta":{"origin":480018,"position":4},"title":"Wyss Yim: Volcanic eruptions and climate variability | Tom Nelson Pod #177","author":"uwe.roland.gross","date":"12\/12\/2023","format":false,"excerpt":"Earth systems scientistPhD University of TasmaniaDoctor of Science University of LondonWorked at the University of Hong Kong for 35 years until retirement where he taught geoscience coursesDeputy Chairman of the Climate Change Science Implementation Team of UNESCO\u2019s International Year of Planet Earth 2007-2009Honorary Science Advisor, Association for Geoconservation, Hong KongMy\u2026","rel":"","context":"In \"Climate change\"","block_context":{"text":"Climate change","link":"https:\/\/climatescience.press\/?tag=climate-change"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/12\/0Screenshot-2023-12-12-170758.png?fit=1200%2C753&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/12\/0Screenshot-2023-12-12-170758.png?fit=1200%2C753&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/12\/0Screenshot-2023-12-12-170758.png?fit=1200%2C753&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/12\/0Screenshot-2023-12-12-170758.png?fit=1200%2C753&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/climatescience.press\/wp-content\/uploads\/2023\/12\/0Screenshot-2023-12-12-170758.png?fit=1200%2C753&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":472070,"url":"https:\/\/climatescience.press\/?p=472070","url_meta":{"origin":480018,"position":5},"title":"Hidden Fire Beneath the Ice: How Subglacial Volcanoes Are Reshaping Antarctica\u2019s Frozen Giant","author":"uwe.roland.gross","date":"09\/18\/2026","format":false,"excerpt":"Antarctica hosts numerous volcanoes, many of them hidden beneath the ice sheet, primarily associated with the West Antarctic Rift System (WARS), a major zone of crustal extension comparable in scale to the East African Rift. 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