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Contour map of the estimated annual probability of the accumulation of 1 cm or more of tephra in the northwestern United States at eruptions at 13 major volcanic centers in the Cascades Range

Cascades Range (regional, USA only), United States, 1987

Plate 4 in: Hoblitt, R. P., Miller, C. D., & Scott, W. E. (1987). Volcanic hazards with regard to siting nuclear-power plants in the Pacific Northwest. U.S. Geological Survey, Open-File Report 87-297. https://doi.org/10.3133/ofr87297



This map was produced by an official agency, but is NOT the most recent, most complete, or main operational map. For the current operational hazard map, please consult the proper institutional authorities.


Click on image for full-size map. If link seems broken, try the archived version.

Map Set

Hoblitt, R. P., Miller, C. D., & Scott, W. E. (1987). Volcanic hazards with regard to siting nuclear-power plants in the Pacific Northwest. U.S. Geological Survey, Open-File Report 87-297. https://doi.org/10.3133/ofr87297
https://doi.org/10.3133/ofr87297

Other Maps In Set:

Map Data

Map ID3381
Hazard Process(es)Tephra fall
Hazard Zone PresentationSingle hazard: A single hazard process is represented on a main map panel
Temporal ScaleBackground, or long-term, map
Spatial ScaleRegional
Publication FormatPoster-style map insert in hazard assessment
Zonation Method(s)Geologic history
Zonation Model(s)
Scenario(s) ConsideredSeason or weather; Source location or direction
Hazard Zone Label(s)Numeric probability
Probability Definition(s)Annual numeric probability
PurposeLand-use planning: Intended to inform citing of facilities, building restrictions, resource management, and infrastructure development
AudienceLand-use planners, city planners, government officials, etc.
Language(s)English
Basemap(s)Street map
Basemap overlay(s)
DiemsionalityPlanimetric (2D or map) view
Color SchemeSymbols and/or lines only