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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 mi (32 km) long (east-west), 11 mi (18 km) wide (north-south), and up to 3,000 ft (910 m) deep.
The 16 x 32 km (20 x 10 mi) Long Valley caldera east of the central Sierra Nevada Range formed as a result of the voluminous Bishop Tuff eruption (considered a "supereruption") about 760,000 years ago.
Nov 20, 2023 · The Long Valley Volcanic Center is an excellent place to learn about volcanoes. Many visitors hike, ski, mountain bike, and fish in the area without realizing they are inside, on, or next to a volcano.
Oct 27, 2023 · Map of the Long Valley area, California. Persistent earthquake and volcanic activity over the past 4 million years has formed the spectacular eastern Sierra landscape in the vicinity of Long Valley caldera and the Mono Basin.
Long Valley Caldera in eastern California (here viewed from its southwest rim toward its northeast rim on the horizon 18 miles away) was formed about 760,000 years ago in a violent volcanic eruption that blew out 150 cubic miles of magma (molten rock) from beneath the Earth's surface.
The Long Valley Caldera is a place of incredible natural wonder, a testament to the power of the Earth's geologic processes.
This guide to the geology of Long Valley Caldera is presented in four parts: (1) An overview of the volcanic geology; (2) a chronological summary of the principal geologic events; (3) a road log with directions and descriptions for 38 field-trip stops; and (4) a summary of the geophysical unrest since 1978 and discussion of its causes.
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