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None in living memory would come close to the Yellowstone volcano. Yellowstone erupts roughly every 600,000 years (the last occasion being 640,000 years ago, so it's overdue!).

Estimates have suggested the next one could be 2,500 times the size of the Mt St Helen's eruption in 1980 - so keep your head down if you're unlucky enough to be in the vicinity. Then again, if Yellowstone blows like it did 2.1 million years ago it could deposit 600 cubic miles of stuff on America (compared to the 0.24 cubic miles St Helens put out). That would bury most of America metres deep and kill around tw-thirds of the population. Eventual ramifications for the world would be equally catastrophic.

An equally large Super Volcano under Lake Toba wiped out most of the human race 73,000 years ago and is said to have affected the generic inheritance of all humans today

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15y ago

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