Skip to main content
U.S. flag

An official website of the United States government

Geologic Studies on Sitkinak Island, Alaska

Detailed Description

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.


Public Domain.