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Alaska Bathymetry: Central Gulf of Alaska Geological Features (pg 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

Geological Features of Central Gulf of Alaska

Fairweather Fault Zone

A trace of the Fairweather Fault Zone was found in the soundings from Survey H04529, a 1925 small-scale (1:100,000) smooth sheet (A), off of Yakobi and Chichagof Islands, just south of Cross Sound. The fault zone is imaged as an east facing scarp (cliff face) and a western uplifted structural block (plateau or ridge) about 25 km long. Shallower soundings in the north (B), center (C) and south (D) show the rough outline of the uplifted structural block.

The explanation of the Fairweather Fault Zone's presence in the area, provided by Peter Haeussler Research Geologist, US Geological Survey, (personal communication, 2011), is corroborated by a single-beam echosounder pass across the structure (E) collected during the 2005 GOA trawl survey (Raring 2007).

fairweather fault zone

Raring, N.W. 2007. Report to industry: Fishing log for the 2005 bottom trawl survey of the Gulf of Alaska. AFSC Processed Rep. 2007-03, 211 p. Alaska Fish. Sci. Cent., Natl. Mar, Fish. Serv., NOAA 7600 Sand Point Way NE, Seattle WA 98115.




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