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Map of Long Valley Caldera Early winter in Long Valley, 2017. 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.
USGS map of the Mono Basin area, showing the Long Valley Caldera (click to see detail). In hydrothermal systems, the circulation of ground water is driven by a combination of topography and geothermal heat sources. The system in the Long Valley Caldera is recharged primarily from snowmelt in the highlands around the western and southern rims of ...
In 2012, the Long Valley Observatory was integrated into the new California Volcano Observatory based in Menlo Park, California which covers the entire states of California and Nevada, this includes the southern Cascade Range volcanoes in the state of California which were previously under the jurisdiction of the Cascades Volcano Observatory. [3]
Map all coordinates using OpenStreetMap. ... Long Valley Caldera: 3390: 11,122 ... Virgin Valley Caldera---16.38 million years ago
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 magma source for Mammoth Mountain is distinct from those of both the Long Valley Caldera and the Inyo Craters. [ 3 ] [ 11 ] [ 12 ] Mammoth Mountain is composed primarily of dacite and rhyolite , [ 13 ] part of which has been altered by hydrothermal activity from fumaroles (steam vents).
And like the Long Valley Caldera, the magma beneath Lassen Volcanic Center is showing clear signs of cooling and contracting, Montgomery-Brown said. California's last major destructive volcanic ...
The area to the north of Red Slate Mountain is among the most seismically active in California which is associated with the Long Valley Caldera. Red Slate Mountain was named by the California Geological Survey, in 1873. However, it is not clear whether the survey meant to name this peak, or Red and White Mountain. [5]