A SUPER-VOLCANO in California which erupted with devastating results hundreds of thousands of years ago has a vast reservoir of semi-molten magma measuring a staggering 240 cubic MILES, a new study has suggested. The amount of magma in the Long Valley Caldera is so large it could support an eruption equivalent to the massive one which occurred 767,000 years ago, which released 140 cubic miles of material into the atmosphere. y comparison, the 1980 Mount St Helens eruption resulted in the release of 0.29 cubic miles.
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