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Three Sisters, Oregon
Eruptive History During the Past 15,000 Years


Volcanic activity in the Three Sisters region and other Central Oregon volcanoes during the past 15,000 years.

Bars indicate approximate age of events or age ranges of several events. Arrow indicates that ages of eruptions are poorly known and may predate 15,000 years ago by several thousand years.

-- Excerpt from: W.E. Scott, R.M. Iverson, S.P. Schilling, and B.J. Fischer, 2001,
Volcano Hazards in the Three Sisters Region, Oregon: U.S. Geological Survey Open-File Report 99-437

Graphic, Three Sisters Vicinity Eruptive History During Past 15,000 Years

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04/23/08, Lyn Topinka