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Annual probability of 1 cm or more of tephra accumulation in WA and...

By Volcano Hazards Program 1905 (approx.)
Annual probability of 1 cm or more of tephra accumulation in Washin...
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Annual probability of 1 cm or more of tephra accumulation in Washington and Oregon from major Cascade volcanoes; Mount Adams is particularly at risk due to its location downwind of Mount St. Helens.