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News about Long Valley Caldera.

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August 15, 2018

Probing the Depths of Long Valley Caldera

A new study by CalVO seismologists used a novel geophysical technique called "full waveform seismic tomography" to image the roots of Long Valley...

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March 15, 2017

New scientific publications about our California Volcanoes by USGS authors

Two new journal articles about California Volcanoes in the eastern part of the state, the Long Valley Caldera and Ubehebe Craters, are headed to press...

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January 19, 2017

Volcano Watch — Exploring USGS volcano observatories—Part 3: California

This month, our Volcano Watch articles are exploring U.S. Geological Survey (USGS) volcano observatories and their connections to Hawai‘i. This week...

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December 14, 2016

Short-lived Long Valley earthquake swarm does not indicate heightened volcanic unrest

A short-lived earthquake swarm occurred overnight under the Long Valley Caldera in eastern California about 4 km (2.5 mi) ESE of the town of Mammoths...

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July 13, 2016

Young and Old Volcanoes East of the Sierra Nevada: New Map, Report and Public Events

A new geologic map of the Long Valley Caldera, Mammoth Mountain, and the Middle Fork canyon of the San Joaquin River including Devils Postpile...

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December 22, 2015

New insight into faults in the Long Valley Caldera reduces the predicted earthquake shaking intensity

The shaking hazard posed by earthquakes on range-front faults near the town of Mammoth Lakes, CA is lower than previously estimated.

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August 12, 2014

Automated Volcanic-Gas Sniffer Installed at Mammoth Mountain Fumarole

In July 2014, USGS Scientists Peter Kelly (Cascades Volcano Observatory) and Stuart Wilkinson (California Volcano Observatory) installed an automated...

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