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Volcano hazards in the Three Sisters Region, Oregon

Three Sisters, United States, 2001

Plate 1 in: Scott, W.E., Iverson, R., Schilling, S.P. & Fisher, B.J. (2001). Volcano Hazards in the Three Sisters Region, Oregon. U.S. Geological Survey, Open-File Report 99-437, 14 p., 1 plate. https://doi.org/10.3133/ofr99437



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 Data

Map ID601
Hazard Process(es)Ballistics; Debris avalanches; Distal hazards; Lahars; Lava flows; PDCs; Proximal hazards; Regional hazards; Tephra fall; Vent-opening hazards
Hazard Zone PresentationGrouped by location (e.g. proximal/distal zones) on a main map and series of insets
Temporal ScaleBackground, or long-term, map
Spatial ScaleVolcano and surrounding area
Publication FormatPoster-style map insert in hazard assessment
Zonation Method(s)Geologic history; Scenario modeling
Zonation Model(s)Energy cone or line (Heim 1932; Sheridan 1979; Sheridan & Malin 1983); LAHARZ or modified version (such as PFZ) (Iverson et al. 1998; Schilling 1998; Schilling 2014); Unnamed tephra model [Hoblitt et al. (1987); Hoblitt & Scott (2011)] (Hoblitt et al. 1987; Hoblitt & Scott 2011)
Scenario(s) ConsideredAnalog volcano(es); Composition; Size, VEI, or intensity; Source location or direction
Hazard Zone Label(s)Hazard process name; Location or source name; Numeric probability; Scenario name
Probability Definition(s)Annual numeric probability; Qualitative relative probability (e.g. high-medium-low)
PurposeMultiple: intended for multiple purposes including general hazard awareness, planning, and crisis management
AudienceMultiple audiences (usually the public, civil authorities, and land-use planners)
Language(s)English
Basemap(s)Contour lines
Basemap overlay(s)Street map
DiemsionalityPlanimetric (2D or map) view
Color SchemeDark to Light (color)
Volcanic Alert Level System
Go to Global Volcanism Program page for Three Sisters →