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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 ...
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.
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.
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).
[8]: 289 This magma chamber is separate from the magma chamber under Long Valley Caldera. [21] The recent eruptions of the Mono Craters have been similar in volume and nearly identical in composition ("crystal-poor high-silica rhyolite") to those of Glass Mountain that preceded the Long Valley Caldera-forming eruption. [10]
Little Walker Caldera; Long Valley Caldera; M. Medicine Lake Volcano; Mount Maidu; T. Tioga Pass caldera This page was last edited on 16 May 2022, at 11:06 (UTC). ...