California Volcano Observatory


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Date published: 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: California, here we come!

Date published: December 28, 2016

Strong Earthquakes near CA-NV border

Three jolting earthquakes occurred in the wee hours this morning near Hawthorne NV, with two M5.7 events and a M5.5 occurring between the hours of 12:18 AM PST and 1:13 AM PST.

Date published: 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 Lakes. The swarm does not appear to be related to increased volcanic unrest.

Date published: December 12, 2016

CalVO Scientists Present Work at International 2016 AGU Fall Meeting

Fifteen CalVO scientists will present work this week at the 2016 American Geophysical Union Fall Meeting, held in San Francisco, California.

Date published: November 29, 2016

Volcanic hazards in the long term: 3rd Volcano Observatory Best Practices (VOBP) workshop

Volcanologists from volcano observatories around the world met at the international Volcano Observatory Best Practices Workshop in Vancouver, Washington from November 15-18th to collaborate on how to best communicate volcanic hazard and risk via long-term assessments.

Date published: September 26, 2016

Earthquake swarm near Salton Buttes is not volcanic

An earthquake swarm started on 26 Sep 2016, 04:03AM PDT, and is ongoing in the Brawley Seismic Zone near the southern terminus of the San Andreas Fault and about 12 km (7.5 mi) north of Salton Buttes.

Date published: 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 Mountain reveals a subsurface marked by active hydrothermal reservoirs (hot water and fluids), bodies of...

Date published: 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 National Monument, recounts the geologic and volcanic history of the area east of the Sierra Nevada in far greater detail than any previously published report.

Date published: July 13, 2016

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

newly released geologic map and U.S. Geological Survey Professional Paper, Eruptive History of Mammoth Mountain and its Mafic Periphery, California, by CalVO scientists Wes Hildreth and Judith Fierstein recount the...

Date published: June 27, 2016

Fieldwork "Fun" Has Begun

Summer has arrived, and for many CalVO scientists, so has the season of fieldwork. During the fall, winter and spring, many of California's volcanoes are covered with snow, and challenging weather conditions make fieldwork difficult and time consuming.

Date published: March 25, 2016

The Short Story of Ubehebe Crater in Death Valley National Park

New research by scientists at CalVO indicates that Ubehebe Craters formed about 2100 years ago during a single eruptive event. Ubehebe Craters are a lone cluster of volcanic craters in the northern half of...

Date published: February 24, 2016

Monitoring California's active volcanoes—seismic unrest is on our radar

Earthquakes rocked residents near the towns of Mammoth Lakes and Big Pine in eastern California this month, including a magnitude 3.74 and 3.44 on February 15 near Mammoth Lakes and another magnitude 4.8 near Big Pine on February 16.