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It is a part of the Volcano Hazards Program of the United States Geological Survey, a scientific agency of the United States government. [ 2 ] Originally, the volcano observatory was known as the Long Valley Observatory which monitored volcanic activity east of the Sierra Nevada in Mono County, California which included Long Valley Caldera ...
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. Long Valley was formed 760,000 years ago when a very large eruption released hot ash ...
The volcano is still active with minor eruptions, the largest of which was a minor phreatic (steam) eruption 700 years ago. [3] Mammoth Mountain also lies on the south end of the Mono-Inyo chain of volcanic craters. [10] The magma source for Mammoth Mountain is distinct from those of both the Long Valley Caldera and the Inyo Craters.
Michael Poland, a geophysicist at the U.S. Geological Survey and the scientist-in-charge of the Yellowstone Volcano Observatory, said that while Campi Flegrei and Long Valley are capable of huge ...
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 National Volcano Early Warning and Monitoring System has two purposes: [11] To "organize, modernize, standardize, and stabilize the monitoring systems of the volcano observatories in the United States, which includes the Alaska Volcano Observatory, California Volcano Observatory, Cascades Volcano Observatory, Hawaiian Volcano Observatory, and Yellowstone Volcano Observatory".
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 ...