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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.
During the past 3,000 years, eruptions have occurred every 250 to 700 years. In 1980, a series of earthquakes and uplift within and south of Long Valley Caldera indicated renewed activity in the area. The region has been used by humans for centuries. Obsidian was collected by Mono Paiutes for making sharp tools and arrow points. Glassy rock ...
The Long Valley Caldera, which includes Mammoth Lakes area, has been having seismic activity, which can precede a volcanic eruption. ... Notably, there were four magnitude 6 earthquakes in the ...
Mammoth Mountain Ski Area trail map; USGS Volcano Hazards Program, Long Valley Observatory; QTVR of tree kill area; Mammoth Earthquake 1980 May 25 16:33, 16:49, 19:44 UTC Magnitude 6.2, 5.9, 5.9 "The Supervolcano in California; Long Valley" (Video (4:52)). GeologyHub. 2021. "Secrets of the Underground" (Documentary). Science Channel. 2017.
Coincidentally, the Long Valley Caldera also saw an uptick in earthquake activity in the 1980s and has been seismically stirring for decades, but scientists have been less concerned overall about ...
Volcanic activity persisted past 5 million years BP east of the current park borders in the Mono Lake and Long Valley areas. The most significant activity was the creation of the Long Valley Caldera about 700,000 years ago in which about 600 times as much material was erupted than in the 1980 eruption of Mt. Saint Helens.
The north-northwest end of the Walker Lane is between Pyramid Lake in Nevada and California's Lassen Peak [1] [2] where the Honey Lake Fault Zone, the Warm Springs Valley Fault, and the Pyramid Lake Fault Zone [3] meet the transverse tectonic zone forming the southern boundary of the Modoc Plateau and Columbia Plateau provinces.
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 ...