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You might envision a stratovolcano as one massive cone with a single summit crater. But in reality, volcanoes are complex constructions that may have...

Volcanoes in California (and everywhere!) are often covered with vegetation, including thick forests. Fortunately, the USGS can use laser technology...

One of the three main ways that California Volcano Observatory scientists monitor the state’s threatening volcanoes is by sampling the gases that are...

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...

USGS Volcanic Threat Assessment updates the 2005 rankings.

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...

This month, our Volcano Watch articles are exploring U.S. Geological Survey (USGS) volcano observatories and their connections to Hawai‘i. This week...

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...