News

What if we told you that scientists can monitor a volcano's "breathing" 24/7, even through deep winter snow? That's exactly what CalVO's permanent gas...

Debris flows or mudflows that form from volcanic material are called lahars. The word lahar comes from Javanese, the language spoken on the island of...

Photographs can be a huge help in interpreting the mechanics and timelines of volcanic eruptions. For example, he 1914–1917 eruptions of Lassen Peak...

Many of us are used to seeing elongated “veins” in the rocks around us - streaks of minerals that precipitated over time to fill fractures in the...

A historic report on volcanoes in northern California by the volcanologist Howell Williams made a curious claim about Goosenest volcano. 

The USGS California Volcano Observatory is saddened to announce the death of Edward Wesley (Wes) Hildreth III, in a vehicle accident on June 19, 2025...

California's volcanoes may be relatively quiet nowadays, but they're still important places to study and monitor - especially ones that are close to...

Ever wonder what scientists are doing when you see them with strange equipment near hot springs and fumaroles? They're collecting some of nature's...

On January 7, 2025, the President announced the designation of the Sáttítla Highlands National Monument, a more than 200,000-acre area which...

This week, the California Volcano Observatory welcomes its newest Scientist-in-Charge, Phillip (Phil) Dawson!