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Cascades Volcano Observatory

Find U.S. Volcano

The U.S. Geological Survey's Cascades Volcano Observatory strives to serve the national interest by helping people to live knowledgeably and safely with volcanoes in Washington, Oregon, and Idaho. 



Tonga’s Hunga eruption produced the most intense lightning ever recorded


Mount Rainier reminds us that September is National Preparedness Month


USGS Offers Emergency Managers a New Tool to Assess Lahar Hazards at Mount Rainier