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Tsunami-generated boulder ridges in Lake Tahoe, California-Nevada

James G. Moore, Richard A. Schweickert, Joel E. Robinson, Mary M. Lahren and Christopher A. Kitts
Tsunami-generated boulder ridges in Lake Tahoe, California-Nevada
Geology (Boulder) (November 2006) 34 (11): 965-968


An array of east-trending ridges 1-2 m high and up to 2 km long occurs on the Tahoe City shelf, a submerged wave-cut bench <15 m deep in the northwest sector of the lake. The shelf is just north of the amphitheater of the giant subaqueous 10 km (super 3) McKinney Bay landslide, which originated on the west wall of Lake Tahoe. Images from a submersible camera show that the ridges are composed of loose piles of boulders and cobbles that lie directly on poorly consolidated, fine-bedded lake beds deposited in an ancestral Lake Tahoe. Dredge hauls from landslide distal blocks, as well as from the walls of the re-entrant of the landslide, recovered similar lake sediments. The McKinney Bay landslide generated strong currents, which rearranged previous glacial-derived debris into giant ripples creating the boulder ridges. The uncollapsed part of the sediment bench, including the Tahoe City shelf, poses a hazard because it may fail again, producing a landslide and damaging waves.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 34
Serial Issue: 11
Title: Tsunami-generated boulder ridges in Lake Tahoe, California-Nevada
Affiliation: U. S. Geological Survey, Menlo Park, CA, United States
Pages: 965-968
Published: 200611
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 17
Accession Number: 2006-091343
Categories: Quaternary geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N38°55'60" - N39°13'60", W120°10'00" - W119°57'00"
Secondary Affiliation: University of Nevada, Nevada 89557, USA, United StatesSanta Clara University, Robotic Systems Laboratory, 500 El Camino Real, Santa Clara, California 95053, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200651
Program Name: USGSOPNon-USGS publications with USGS authors
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