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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 Bishop Tuff is a welded tuff which formed 764,800 ± 600 years ago as a rhyolitic pyroclastic flow during the approximately six-day eruption that formed the Long Valley Caldera. [1] [2] [3] Large outcrops of the tuff are located in Inyo and Mono Counties, California, United States. Approximately 200 cubic kilometers of ash and tuff erupted ...
The Long Valley Caldera was formed by a super-eruption about 760,000 years ago that blasted 140 cubic miles of magma, covering much of east-central California in hot ash that was blown as far away ...
Mammoth Mountain is a lava dome complex in Mono County, California.It lies in the southwestern corner of the Long Valley Caldera [6] and consists of about 12 rhyodacite and dacite overlapping domes. [7]
A long-quiet yet massive super volcano, dubbed the "Long Valley Caldera," has the potential to unleash a fiery hell across the planet, and the magma-filled mountain has a history of doing so.
Photos of Inyo Craters, California, USGS Hazards Program, Long Valley Observatory, archived from the original on 2010-06-14 Hill, David; et al. (2002), Response plan for volcano hazards in the Long Valley Caldera and Mono Craters region, California , United States Geological Survey, ISBN 978-0-607-98488-0 , Bulletin 2185 , retrieved 2011-05-27
The peak lies 20 miles (32 km) southeast of the shoreline of Mono Lake and is the highest point on the four-mile (6.4 km) long sinuous Glass Mountain Ridge. [3] [4] [5] The Glass Mountain Ridge forms the northeast boundary of Long Valley Caldera.
The system in the Long Valley Caldera is recharged primarily from snowmelt in the highlands around the western and southern rims of the caldera. The meltwater infiltrates to depths of a few kilometers (or miles), where some is heated to at least 430 °F (220 °C) by hot rock near the Inyo craters. The heated water, kept from boiling by high ...