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Review of the origin of the Braid Scarp near the Pebble prospect, southwestern Alaska

Open-File Report 2011-1028

By:
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Abstract

A linear geomorphic scarp, referred to as the 'Braid Scarp,' lies about 5 kilometers north of Iliamna Lake, Alaska, and has been identified as a possible seismically active fault. We examined the geomorphology of the area and an 8.5-meter-long excavation across the scarp. We conclude that the scarp was formed by incision of a glacial outwash braid plain into a slightly older outwash plain as ice stagnated in the region during deglaciation 11-15 thousand years ago. We found no evidence for active faulting along the scarp.

Geospatial Extents

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Review of the origin of the Braid Scarp near the Pebble prospect, southwestern Alaska
Series title:
Open-File Report
Series number:
2011-1028
Year Published:
2011
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Alaska Science Center
Description:
iii, 14 p.
Number of Pages:
14
Country:
United States
Additional Online Files(Y/N):
N