California supervolcano discovered to be hiding 240 cubic miles of magma

Scientists reveal how the Long Valley supervolcano formed

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FreshWater® Salt System - Water Care - Caldera Spas

HOT CREEK GEOLOGIC SITE. This caldera/volcanic basin is 10 x 18 miles and was formed by a volcanic eruption over 700,000 years ago. There are beautiful turquoise hot springs at the Interpretive Trail, but don’t even think about going in these waters unless you want to be boiled alive! 14 people have either died or been seriously burned since 1968. So obey all the signs and don’t wander off trail! Snow melt from the Sierra Nevada filters through cracks in the earth and is heated and pressurized b

Long Valley volcano could threaten the future of humanity