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.
(USGS Photo by William E. Scott, Cascades Volcano Observatory).
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