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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

Our bathymetry editing resulted in the first detailed imaging of several noteworthy geological features including banks, earthquake faults and probable glacial moraines. Interesting examples of these geological features include the Kayak Trough depressions, Fairweather Fault Zone, relic marine terraces around Middleton Island, and faults off Kodiak Island.

kayak trough

Kayak Trough

The depressions within Kayak Trough, a glacial feature composed of a flat floor bordered by steep edges along its inland margins, are about 70 m deep on the eastern side and about 20 m deep on the western side. These depressions are remnants of a deeper Kayak Trough, the center of which has been filled with sediment (Sean Gulick, Research Assoc. Prof., Institute for Geophysics, Jackson School of Geosciences, Univ. Texas at Austin, personal communication, 2012; Worthington et al. 2008) from the Copper River (Jeager et al., 1998). Currents may play an important role in forming (scouring) and maintaining these depressions (Sean Gulick, personal communication, 2012).

References
Jaeger, J.M., C.A. Nittrouer, N.D. Scott, and J.D. Milliman. 1998. Sediment accumulation along a glacially impacted mountainous coastline: north-east Gulf of Alaska. Basin Research 10: 155-173.

Worthington, L., Gulick, S., Pavlis, T., Bruns, R., Mann, P., Localized deformation zones in the offshore leading edge of the Yakutat microplate, Gulf of Alaska Active Tectonics and Seismic Potential of Alaska, edited by J.T. Freymueller, P.J. Haeussler, R.L. Wesson, G. Ekström, Geophysical Monograph Series, Volume 179, 350 pp., ISBN 978-0-87590-444-3, 2008.

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