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Global Volcanism Program | Image GVP-02917

The 2 x 3.5 km horseshoe-shaped crater at Mount St. Helens is typical of scarps formed by massive landslides. On 18 May 1980 the upper 400 m of the summit was removed, leaving the crater open to the N. This event was the world's largest landslide during historical time. The missing portion of the volcano transitioned into the debris avalanche deposits filling the North Fork Toutle River below the volcano. Photo by Terry Leighley, 1981 (U.S. Geological Survey).

The 2 x 3.5 km horseshoe-shaped crater at Mount St. Helens is typical of scarps formed by massive landslides. On 18 May 1980 the upper 400 m of the summit was removed, leaving the crater open to the N. This event was the world's largest landslide during historical time. The missing portion of the volcano transitioned into the debris avalanche deposits filling the North Fork Toutle River below the volcano.

Photo by Terry Leighley, 1981 (U.S. Geological Survey).

Creative Commons Icon This image is made available as a Public Domain Work, but proper attribution is appreciated.

Keywords: debris avalanche | landslide scarp | crater


St. Helens