Global Volcanism Program | Image GVP-02671
These small hills in the foreground of Alaska's Augustine volcano show a morphology common to debris avalanche deposits. The hummocks consist of relatively intact segments of the volcanic edifice that were transported long distances without disaggregating. This debris avalanche traveled roughly 11 km from the summit about 450 years ago.
Photo by Lee Siebert, 1987 (Smithsonian Institution).