News

News related to Mammoth Mountain.

May 13, 2020

Unpacking CalVO's new seismic monitoring boxes

If you've noticed any changes to the earthquake counts released in CalVO's weekly updates, don't worry - some behind-the-scenes improvements to our...

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January 8, 2018

Geologic maps lay the foundation for this virtual tour of western states volcanoes.

Take a virtual geologic tour in the USGS Geonarrative, Volcanic Landscapes.

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September 13, 2016

What's Under Long Valley? Water, Heat, and Molten Rock!

A picture is worth a thousand words—USGS Post Doctoral Fellow Jared Peacock's new 3D geophysical model for the Long Valley Caldera and Mammoth...

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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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July 13, 2016

Young and Old Volcanoes in Eastern California: New Map, Report and Public Events

A newly released geologic map and U.S. Geological Survey Professional Paper, Eruptive History of Mammoth Mountain and its Mafic Periphery, California...

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June 27, 2014

Small Earthquake Swarm

A swarm of small earthquakes (magnitudes less than 2) occurred at a depth of 6-7 km (about 4 miles) beneath Highway 203 in Mammoth Lakes, California...

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February 18, 2014

Earthquake swarm under Mammoth Mountain - Update

The earthquake swarm under Mammoth Mountain which started on February 3, 2014 has declined over the past few days. The daily numbers of earthquakes...

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February 6, 2014

Earthquake swarm under Mammoth Mountain

An earthquake swarm under Mammoth Mountain (Mono County, CA), which started slowly on February 3, 2014 intensified in the early hours of February 5...

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