Volcano Hazards Program

U.S. Geological Survey
Open-File Report 2007-1221
Version 1.0

Digital Data for Volcano Hazards of the Three Sisters Region, Oregon

By S.P. Schilling, S. Doelger, W.E. Scott, and R.M. Iverson

2008

Data to accompany U.S. Geological Survey Open-File Report 99-437



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[Aerial view from southeast of Three Sisters volcanic center (South, Middle, and North Sister left of center; Broken Top right of center). Light colored areas on south flank of South Sister are 2,000-yr-old lava flows. Much of area on lower flanks of Broken Top is mantled by pumice and ash erupted just prior to emplacement of these lava flows. Photo by William E. Scott, USGS.] Aerial view from southeast of Three Sisters volcanic center (South, Middle, and North Sister left of center; Broken Top right of center). Light colored areas on south flank of South Sister are 2,000-yr-old lava flows. Much of area on lower flanks of Broken Top is mantled by pumice and ash erupted just prior to emplacement of these lava flows. (USGS Photo by William E. Scott, Cascades Volcano Observatory).
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