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St. Helens, United States
Official, Figure in hazard assessment
Zones of volcanic risk at Mount St. Helens February 1982
Figure 4 in: Newhall, C.G. (1982). A method for estimating intermediate- and long-term risks from volcanic activity, with an example from Mount St. Helens, Washington. U.S. Geological Survey, Open-File Report 82-396, 59 p. doi: 10.3133/ofr82396

St. Helens, United States
Official, Figure in hazard assessment
Zones of volcanic risk at Mount St. Helens June 1980
Figure 2 in: Newhall, C.G. (1982). A method for estimating intermediate- and long-term risks from volcanic activity, with an example from Mount St. Helens, Washington. U.S. Geological Survey, Open-File Report 82-396, 59 p. doi: 10.3133/ofr82396

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