Whitewater Rafting Trips in California

08/20/2025

https://www.facebook.com/690224203/posts/10162954655334204/?mibextid=wwXIfr

05/21/2025

03/30/2025

Vote for the Colorado River now!

03/24/2025

Make your first round bracket pick for American Rivers River Madness! First round voting ends March 22.

03/22/2025

Vote for the Tuolumne River now!

03/09/2025

All volcanoes in California were at normal background levels of activity last week. https://www.usgs.gov/programs/VHP/volcano-updates (Scroll down for details)

How many active volcanoes are there in California? The answer might surprise you!

California has eight volcanic areas which the USGS California Volcano Observatory monitors: Mount Shasta, Medicine Lake, the Lassen Volcanic Center, the Clear Lake Volcanic Field, the Long Valley Region (including Mammoth Mountain), Mono-Inyo Craters, the Coso Volcanic Field, and Salton Buttes. Each of these volcanoes has erupted in the last few thousand years AND has magma somewhere in its plumbing system, meaning it could erupt again in the future. The last eruption in California was even caught on film in 1915 (https://www.youtube.com/watch?v=nZD9K4q55jk)!

Currently, all of California's volcanoes are quiet. But as we know from dozens of other eruptions the USGS has responded to, there's always a chance they could reawaken. That's why the USGS California Observatory, together with scientists from our four other observatories, maintains extensive monitoring networks on these volcanoes, and continues to do crucial research into their geology and hazards. Check out the monitoring map and geologic history at https://www.usgs.gov/observatories/calvo!

-----------------------------------------------------------
Recent observations: Earthquakes >M1 were observed at the Clear Lake Volcanic Field, the Coso Volcanic Field, and Salton Buttes. Typical moderate levels of seismicity were present in The Geysers south of Clear Lake and in the Sierra Nevada range south of the Long Valley Caldera.