Map of pre-1980 Mount St. Helens volcano and adjacent area.
St. Helens, United States, 1989
Figure 19 in: Crandell, D.R. (1989). Gigantic debris avalanche of Pleistocene age from ancestral Mount Shasta Volcano, California, and debris-avalanche hazard zonation. U.S. Geological Survey, Bulletin 1861, 32 p. https://doi.org/10.3133/b1861
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.
Crandell, D.R. (1989). Gigantic debris avalanche of Pleistocene age from ancestral Mount Shasta Volcano, California, and debris-avalanche hazard zonation. U.S. Geological Survey, Bulletin 1861, 32 p. https://doi.org/10.3133/b1861Map Set
https://doi.org/10.3133/b1861
Other Maps In Set:
Map Data
Map ID 641 Hazard Process(es) Debris avalanches 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 Volcano and surrounding area Publication Format Figure in a hazard assessment or mitigation plan Zonation Method(s) Scenario modeling Zonation Model(s) Energy cone or line (Heim 1932; Sheridan 1979; Sheridan & Malin 1983) Scenario(s) Considered Analog volcano(es); Size, VEI, or intensity Hazard Zone Label(s) Scenario name Probability Definition(s) No probability definition was discernable from the map 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) Simple or sketch map Basemap overlay(s) Diemsionality Planimetric (2D or map) view Color Scheme Symbols and/or lines only