Hazards
Hazards
Volcano hazards in the Cascade Range.
Volcano Hazards in the Cascade Range
Volcano Hazards in the Cascade Range
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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.
Lahars – The Most Threatening Volcanic Hazard in the Cascades
Lahars, along with debris flows and debris avalanches, are masses of rock, mud and water that travel rapidly downslope and downstream under the action of gravity.
Excess Sediment Accumulation Causes Flooding in the Cascades
Release of excessive sediment from volcanically disturbed watersheds can persist for decades and greatly extend the duration of an eruption's damaging effects
Debris Avalanches Occur at Many Cascade Volcanoes
Massive slope collapse is natural part of the life cycle of Cascade volcanoes.
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.
Lava Flows, Domes, and Pyroclastic Flows Build Cascade Volcanoes
Cascade Range stratovolcanoes are built as repeated eruptions accumulate hundreds of overlapping lava flows, lava domes, and layers of rock rubble from pyroclastic flows.