Figure
15.
Tephra hazard map for Mt. St. Helens. A. Wind direction data
for the area. B. Expected tephra thickness in the three hazard
zones downwind of the volcano based on tephra falls of 1, 0.1 and
0.01 km3. C. Tephra hazard zones. Adapted from Crandell and
Mullineaux (1978).
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