California Volcano Observatory


Filter Total Items: 84
Date published: November 4, 2019

CalVO announces Dr. Andy Calvert as new Scientist-in-Charge

After 36 years with the USGS and 7 years as the Scientist-in-Charge of CalVO, Dr. Margaret (Maggie) Mangan will be stepping down from leading the Observatory. Her successor is Dr. Andrew (Andy) Calvert, a USGS Menlo Park scientist since 2001 and a member of CalVO since its inception in 2012. 

Date published: August 27, 2019

New names at Newberry drawn from CalVO geologist's mapping

In June 2019, the U.S. Board on Geographic Names approved twenty-five new formal geographic names at Newberry Volcano in central Oregon. The names were proposed by Julie Donnelly-Nolan, a Research Geologist with the Volcano Science Center of the USGS in Menlo Park, CA.

Date published: July 10, 2019

Earthquake swarm south of Coso Volcanic Field continues with declining intensity. We continue to monitor

The seismic activity that started on the evening of July 5 at the southern margin of Coso Volcanic Field in Inyo County, California continues at a rate of about 600 M1.0 or greater earthquakes per day.

Date published: July 6, 2019

Earthquake swarm south of Coso Volcanic Field related to tectonic, not volcanic, activity. We continue to monitor.

An earthquake swarm started on the evening of July 5 at the southern margin of Coso Volcanic Field in Inyo County, California.

Date published: May 6, 2019

The National Volcano Early Warning System (NVEWS) will help USGS better monitor nation’s most dangerous volcanoes

In September 2004, USGS scientists detected sudden, but unmistakable, signs that Mount St. Helens was waking up. Volcano monitors had picked up the occurrence of hundreds of small earthquakes and other signals that the volcano’s crater floor had begun to rise. Within a week, several eruptions blasted clouds of ash into the atmosphere, and soon after, a new lava dome emerged in the crater.

Date published: May 3, 2019

CalVO researchers collaborate with Yellowstone Volcano Observatory to determine rhyolite lava eruption intervals in caldera

In addition to studying volcanic processes and their associated hazards in California and Nevada, scientists at the California Volcano Observatory also collaborate with other volcano observatories to work on volcanic processes throughout the United States.

Date published: April 2, 2019

Voluminous Pleistocene basalt flows in northern California erupted within a few hundred years of each other

Scientists at the volcano observatories of the U.S. Geological Survey pay close attention to volcanoes of the Cascade Range, Alaskan Peninsula and Aleutian Arc.

Date published: March 7, 2019

New geochronology reveals the volcanic history of Mono Craters

The Mono Craters, a line of volcanic domes and craters south of Mono Lake in eastern California, represent the youngest rhyolitic volcanoes in the western United States.

Date published: February 25, 2019

New report details what's in harm's way near California's volcanoes

The potential for damaging earthquakes, landslides, floods, tsunamis, and wildfires is widely recognized in California.

Date published: February 7, 2019

USGS Director visits CalVO

During a tour of western USGS offices, Director James F. Reilly II visited the CalVO offices and operations center in Menlo Park, CA.

Date published: December 21, 2018

We continue to monitor and report on volcanic activity during any lapse in appropriations

During the current federal government shutdown, the Volcano Hazard Program and all five U.S. Volcano Observatories will continue to issue updates, warnings, and notifications through the usual channels, including websites, email, and social media.