Ash/Tephra Fall
Ash/Tephra Fall
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Volcano Hazards in the Cascade Range
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 WA, OR, and ID.
Tephra Fall Is a Widespread Volcanic Hazard
Falling ash, even in low concentrations, can disrupt human activities hundreds of miles downwind, and drifting clouds of fine ash can endanger jet aircraft thousands of miles away.