Global Volcanism Program | Image GVP-03104

South Sister, seen here from the south, still contains a preserved summit crater although glaciers have eroded the flanks. Holocene eruptions have occurred from flank vents. Photo by Dan Miller, 1977 (U.S. Geological Survey).

South Sister, seen here from the south, still contains a preserved summit crater although glaciers have eroded the flanks. Holocene eruptions have occurred from flank vents.

Photo by Dan Miller, 1977 (U.S. Geological Survey).

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Keywords: stratovolcano | erosion

Three Sisters