Global Volcanism Program | Image GVP-05211
During the late Pleistocene or early Holocene Mount Spurr underwent flank collapse, resulting in the 5-6 km crater that opens to the south shown here in 1993. The collapse produced a debris avalanche that traveled at least 25 km from the summit. The snow-covered peak (center) is a post-collapse lava dome. Crater Peak, in front of it, has been the source of frequent Holocene eruptions.
Photo by Christina Neal, 1993 (U.S. Geological Survey, Alaska Volcano Observatory).
This image is made available as a Public Domain Work, but proper attribution is appreciated.