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Submarine landslides of the Southern California Borderland

Homa J. Lee, H. Gary Greene, Brian D. Edwards, Michael A. Fisher and William R. Normark
Submarine landslides of the Southern California Borderland (in Earth science in the urban ocean; the Southern California continental borderland, Homa J. Lee (editor) and William R. Normark (editor))
Special Paper - Geological Society of America (2009) 454: 251-269

Abstract

Conventional bathymetry, sidescan-sonar and seismic-reflection data, and recent, multibeam surveys of large parts of the Southern California Borderland disclose the presence of numerous submarine landslides. Most of these features are fairly small, with lateral dimensions less than approximately 2 km. In areas where multibeam surveys are available, only two large landslide complexes were identified on the mainland slope-Goleta slide in Santa Barbara Channel and Palos Verdes debris avalanche on the San Pedro Escarpment south of Palos Verdes Peninsula. Both of these complexes indicate repeated recurrences of catastrophic slope failure. Recurrence intervals are not well constrained but appear to be in the range of 7500 years for the Goleta slide. The most recent major activity of the Palos Verdes debris avalanche occurred roughly 7500 years ago. A small failure deposit in Santa Barbara Channel, the Gaviota mud-flow, was perhaps caused by an 1812 earthquake. Most landslides in this region are probably triggered by earthquakes, although the larger failures were likely conditioned by other factors, such as oversteepening, development of shelf-edge deltas, and high fluid pressures. If a subsequent future landslide were to occur in the area of these large landslide complexes, a tsunami would probably result. Runup distances of 10 m over a 30-km-long stretch of the Santa Barbara coastline are predicted for a recurrence of the Goleta slide, and a runup of 3 m over a comparable stretch of the Los Angeles coastline is modeled for the Palos Verdes debris avalanche.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 454
Title: Submarine landslides of the Southern California Borderland
Title: Earth science in the urban ocean; the Southern California continental borderland
Author(s): Lee, Homa J.Greene, H. GaryEdwards, Brian D.Fisher, Michael A.Normark, William R.
Author(s): Lee, Homa J.editor
Author(s): Normark, William R.editor
Affiliation: U. S. Geological Survey, Menlo Park, CA, United States
Affiliation: U. S. Geological Survey, Menlo Park, CA, United States
Pages: 251-269
Published: 2009
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 74
Accession Number: 2009-074433
Categories: OceanographyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: sects., sketch maps
N32°00'00" - N34°00'00", W120°30'00" - W117°30'00"
Secondary Affiliation: Bedford Institute of Oceanography, CAN, CanadaMoss Landing Marine Laboratories, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200940
Program Name: USGSOPNon-USGS publications with USGS authors
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