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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Map Set

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/ofr95497
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)
Volcanic Alert Level System

Go to Global Volcanism Program page for St. Helens →