Volcanoes

Although eruptions are not frequent, volcanoes remain an active hazard in the state and could impact public safety and the economy in the future.

“California is the most geologically diverse state in the nation. We are known for our earthquakes, landslides and flood hazards. But our nearly forgotten hazard is our volcanoes.”Dr. John Parrish, State Geologist of California

Volcanic Areas in California

Active and Potentially Active Volcanoes in California

• Medicine Lake
• Mount Shasta
• Lassen Peak
• Clear Lake
• Long Valley (Inyo, Mono, Mammoth)
• Coso Peak

Volcano Resources

Explore key volcano resources

Volcano monitoring and activity

• California Volcano Observatory

Volcano hazards and risk information

• USGS Volcano Hazard Program

Volcanic ash and aviation impacts

• NOAA Volcanic Ash Advisory Centers

Monitoring and Observatories

• Alaska Volcano Observatory
• California Volcano Observatory
• Cascades Volcano Observatory
• Yellowstone Volcano Observatory

Research and Hazard Information

• USGS Volcano Hazard Program
• NOAA Volcanic Ash Advisory Centers