File:Southeast wall eastern Ukinrek Maar crater 1990.jpg

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Summary

Description
English: "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.

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."
Date
Source http://www.avo.alaska.edu/image_full.php?id=426
Author C. Neal, U.S. Geological Survey

Licensing

Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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4 June 1990

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current23:34, 23 January 2009Thumbnail for version as of 23:34, 23 January 20091,024 × 701 (164 KB)Gump Stump{{Information |Description={{en|1="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 gla

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