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Map showing one-year probability of accumulation of 1 centimeter

By Volcano Hazards Program 2013 (approx.)
Map showing one-year probability of accumulation of 1 centimeter
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Detailed Description

Map showing one-year probability of accumulation of 1 centimeter (0.4 inch) or more of tephra from eruptions of volcanoes in the Cascade Range.

Sources/Usage

Public Domain.