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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.
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.
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 ...
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 Mono–Inyo Craters are a volcanic chain of craters, domes and lava flows in Mono County, Eastern California. The chain stretches 25 miles (40 km) from the northwest shore of Mono Lake to the south of Mammoth Mountain. The Mono Lake Volcanic Field forms the northernmost part of the chain and consists of two volcanic islands in the lake and ...
Volcanoes which have not erupted during the Holocene were not included. USGS noted that though less probable it is still possible for volcanoes to erupt on longer intervals than that. [4] USGS map of the Mono Basin area, showing the Long Valley Caldera (click on to see detail).
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.
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 ...