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Supervolcanoes: The Eruptions That Changed Civilization

@garagelab | 2026-05-13 07:20:24 |

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- VEI scale context: Tambora 1815 (VEI 7) ejected 160 km³ of material — 1,000x more than Mount St. Helens. Toba ~74,000 years ago (VEI 8) ejected ~2,800 km³, potentially reducing global temperature by 3-5°C for years
- The "Year Without a Summer" (1816): Tambora's sulfur dioxide aerosols reflected sunlight globally — crop failures in North America and Europe, famine in Ireland, Lord Byron wrote Darkness, Mary Shelley wrote Frankenstein during the cold dark summer
- Genetic bottleneck hypothesis: Toba's volcanic winter may have reduced human population to 3,000-10,000 individuals — explaining the surprisingly low genetic diversity of modern humans compared to other great apes (though contested)
- Yellowstone monitoring: The Yellowstone caldera last erupted 640,000 years ago — USGS monitors 3,000 earthquakes/year there, but eruption probability in any given century is <0.00014%, comparable to being hit by an asteroid
- Agricultural civilization vulnerability: The Bronze Age Collapse (~1200 BCE) correlated with a prolonged drought, potentially triggered by volcanic forcing — demonstrating how food system fragility amplifies geological events

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