Map of Washington and Oregon showing the percentage probability of accumulation of ten or more centimeters (four or more inches) of tephra from a large eruptions of Mount St. Helens.
St. Helens, United States, 1995
Figure 2 in: Wolfe, E.W. & Pierson, T.C. (1995). Volcanic-Hazard Zonation for Mount St. Helens, Washington, 1995. U.S. Geological Survey, Open-File Report 95-497, 12 p., 1 plate. https://doi.org/10.3133/ofr95497
This map was produced by an official agency, but may not be the most recent, most complete, or main operational map.
For the current operational hazard map, please consult the proper institutional authorities.
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Wolfe, E.W. and Pierson, T.C. (1995). Volcanic-Hazard Zonation for Mount St. Helens, Washington, 1995. U.S. Geological Survey, Open-File Report 95-497, 12 p., 1 plate. https://doi.org/10.3133/ofr95497Map Set
https://doi.org/10.3133/ofr95497
Other Maps In Set:
Map Data
Map ID 1114 Hazard Process(es) Tephra fall Hazard Zone Presentation Single hazard: A single hazard process is represented on a main map panel Temporal Scale Background, or long-term, map Spatial Scale Regional Publication Format Figure in a hazard assessment or mitigation plan Zonation Method(s) Scenario modeling Zonation Model(s) Unnamed tephra model [Hoblitt et al. (1987); Hoblitt & Scott (2011)] (Hoblitt et al. 1987; Hoblitt & Scott 2011) Scenario(s) Considered Analog volcano(es) Hazard Zone Label(s) Numeric probability Probability Definition(s) Numeric probability Purpose Multiple: intended for multiple purposes including general hazard awareness, planning, and crisis management Audience Multiple audiences (usually the public, civil authorities, and land-use planners) Language(s) English Basemap(s) Administrative boundaries (e.g. county, park, intl.) Basemap overlay(s) Diemsionality Planimetric (2D or map) view Color Scheme Dark to Light (greyscale)