California Volcano Observatory


Filter Total Items: 77
Date published: 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 monitoring system have been implemented which allow us to focus on unrest specifically related to our volcanoes and volcanic regions.

Date published: April 13, 2020

Clearing up the volcanic history at Clear Lake

A group of scientists at CalVO have recently begun a new investigation of the Clear Lake Volcanic Field (CLVF), a seismically and geothermally active volcanic system located just ~150 km (93 miles) north of the San Francisco Bay Area.

Date published: March 31, 2020

Hydrologist Steve Ingebritsen retires after 40 years

Dr. Steve Ingebritsen retires this week from the USGS after a stellar career spanning four decades.

Date published: March 24, 2020

California Volcano Observatory Operations during COVID-19

California Volcano Observatory monitoring activities continue as normal; scientists and staff following precautionary safety measures.

Date published: February 3, 2020

M4.4 "Sierra Block" earthquake west of Mammoth Lakes

At 10:36:54 PST (18:36:54 UTC on) 1 February, a M4.4 earthquake occurred under McGee Mountain near Toms Place, CA, at a depth of 10 km.

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.