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Overlay represents area within CalVO's jurisdiction.
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Monthly Update
Thursday, March 01, 2018 11:50 AM US/Pacific
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
California Volcano Observatory's mission
As a part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory aims to advance scientific understanding of volcanic processes and lessen the harmful impacts of volcanic activity in the volcanically active areas of California and Nevada.

NEWS   (archive)
Young Volcanoes in California & Nevada1

USGS volcanologists conduct volcanic crisis training in Chester, CA
December 18, 2017

It isn't often that scientists and land managers spend two entire days together talking about volcanoes outside of an eruptive crisis, but a special FEMA training course allows them to do just that. In mid-November, Margaret Mangan and Jessica Ball of CalVO, John Ewert of CVO and Jeff Rubin of Tualatin Valley Fire and Rescue led local emergency managers, fire responders, law enforcement officers, and National Park staff in a FEMA Volcanic Crisis Awareness training held in Chester, CA (near Lassen Volcanic National Park).

The course is designed to give a primer on volcanic hazards and how the USGS monitors volcanoes and communicates in a crisis, but also devotes ample time to a tabletop eruption scenario where emergency managers are led through a fictional volcanic crisis and discuss how they would respond to escalating volcanic activity. The two-day course addresses the scientific, communication, managerial, and psychological aspects of volcanic crises, and allows insight into the goals of different groups in responding to volcanic hazards. CalVO scientists will conduct a similar training at Lassen Volcanic National Park in January 2018.

Explore California's volcanic legacy and future with new field trip guides
July 05, 2017

California is well-known for its frequent earthquakes, but less so for its volcanic history – despite the fact that the most recent eruption in the state occurred just 100 years ago. Nearly every kind of volcanic landform is represented in California, from the stratocone of Mount Shasta to the lava domes of the Mono-Inyo Craters to the steam explosion features of Ubehebe Craters. To explore this wealth of geologic phenomena, use some of the USGS's newly published and upcoming volcanic field trip guides!

Several new and updated field guides for the 2017 Scientific Assembly of the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) in Portland, Oregon showcase California's volcanoes. Upcoming publications for Medicine Lake, Mount Shasta, Lassen Peak, Long Valley and Mammoth Mountain will provide easy to follow and informative field trips. The new collection of guidebooks can be found at the USGS Publications Warehouse and summarizes decades of advances in understanding volcanic and tectonic processes of western North America.