USGS Multimedia Gallery
Title: Geologic Studies on Sitkinak Island, Alaska
A tidal marsh bank exposed during low tide on Sitkinak Island, Alaska. The bank reveals ledges of alternating peat and silt. Abrupt uplift and subsidence during large megathrust earthquakes is interpreted to be the cause of the alternating layers.
Location: Sitkinak Island, AK, USA
Date Taken: 7/2011
Photographer: Rich Briggs
Usage: This image is public domain/of free use unless otherwise stated. Please refer to the USGS Copyright section for how to credit the photo.
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