U.S. Geological Survey

Slide 50

50. Photograph taken just after earthquake in 1886 showing a typical craterlet. Depth of craterlet is about 1 m; width is about 2 to 3 m. The white material around the craterlet is vented sand. The black wall of the craterlet is humate-enriched sand (the A-horizon) that was located at and near the ground surface at the time of the earthquake.


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THUMBNAIL INDEX

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Last revised November 24, 1998

For more information, contact Stephen F. Obermeier