Global Volcanism Program | Image GVP-02761
Glacier Peak, seen here from the summit of Mt. Pugh to the west, is located in the Glacier Peak Wilderness Area. It has produced voluminous eruptions that deposited thick pyroclastic flow and lahar deposits that blocked drainages, diverting the courses of the Suiattle and Swauk rivers northward into the Skagit River valley.
Photo by Lee Siebert, 1972 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.