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Southeast wall of the eastern Ukinrek Maar crater. The rhythmically layered, dark gray material visible in the wall consists of more than 15 m (50 ft) of phreatomagmatic tephra. The 1977 tephra sits on an exposure of glacial till capping ash-flow deposits from Ugashik Caldera. The lake has filled the original crater to a depth of more than 30 m (100 ft). In the distance at very top of photograph are debris-avalanche hummocks from an unknown source near the current site of Peulik volcano. Photograph by C. Neal, U.S. Geological Survey, June 4, 1990.

Southeast wall of the eastern Ukinrek Maar crater. The rhythmically layered, dark gray material visible in the wall consists of more than 15 m (50 ft) of phreatomagmatic tephra. The 1977 tephra sits on an exposure of glacial till capping ash-flow deposits from Ugashik Caldera. The lake has filled the original crater to a depth of more than 30 m (100 ft). In the distance at very top of photograph are debris-avalanche hummocks from an unknown source near the current site of Peulik volcano. Photograph by C. Neal, U.S. Geological Survey, June 4, 1990.

Date: Jun 4th, 1990
Volcano(es): Ukinrek Maars
Photographer: Neal, C. A.
URL: avo.alaska.edu/image/view/426
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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