Long Valley Caldera

Local nameLong Valley Caldera
LocationCalifornia, United States

Long Valley Caldera is a depression in eastern California that is adjacent to Mammoth Mountain. The valley is one of the Earth's largest calderas, measuring about 20 miles long, 11 miles wide, and up to 3,000 feet deep.

Long Valley was formed 760,000 years ago when a supervolcanic eruption released very hot ash that later cooled to form the Bishop tuff that is common to the area. The eruption emptied the magma chamber under the area to the point of collapse. The second phase of the eruption released pyroclastic flows that burned and buried thousands of square miles. Ash from this eruption blanketed much of the western part of what is now the United States.

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More information and contact

Wikipedia https://en.wikipedia.org/wiki/Long_Valley_Caldera

Address 93546, United States

Coordinates 37°43'0.001" N -118°53'3.001" E

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