Tom Brigham and Game McGimsey of the U.S. Geological Survey climbing party reaching the east
rim of the summit caldera on 4,766-m (15,636 ft)-high Mount
Churchill, site of two of the most voluminous explosive
eruptions in North America in the past 2,000 years. Blocky
debris in the photo consists of pumice and lithic fragments
ejected 1,250 years ago. This deposit forms the eastern
lobe of the White River Ash. Photo by G. Dubois, U.S.
Geological Survey, May 20, 1990.
Image courtesy of AVO / U.S. Geological Survey.
Please cite the photographer and the Alaska Volcano Observatory/U.S. Geological Survey when using this image.
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