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GEOREF RECORD

Late Quaternary sediment-accumulation rates within the inner basins of the California continental borderland in support of geologic hazard evaluation

William R. Normark, Mary M. McGann and Ray W. Sliter
Late Quaternary sediment-accumulation rates within the inner basins of the California continental borderland in support of geologic hazard evaluation (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: 117-139

Abstract

An evaluation of the geologic hazards of the inner California Borderland requires determination of the timing for faulting and mass-movement episodes during the Holocene. Our effort focused on basin slopes and turbidite systems on the basin floors for the area between Santa Barbara and San Diego, California. Dating condensed sections on slopes adjacent to fault zones provides better control on fault history where high-resolution, seismic-reflection data can be used to correlate sediment between the core site and the fault zones. This study reports and interprets 147 radiocarbon dates from 43 U.S. Geological Survey piston cores as well as 11 dates from Ocean Drilling Program Site 1015 on the floor of Santa Monica Basin. One hundred nineteen dates from 39 of the piston cores have not previously been published. Core locations were selected for hazard evaluation, but despite the nonuniform distribution of sample locations, the dates obtained for the late Quaternary deposits are useful for documenting changes in sediment-accumulation rates during the past 30 ka. Cores from basins receiving substantial sediment from rivers, i.e., Santa Monica Basin and the Gulf of Santa Catalina, show a decrease in sediment supply during the middle Holocene, but during the late Holocene after sea level had reached the current highstand condition, rates then increased partly in response to an increase in El Nino-Southern Oscillation events during the past 3.5 ka.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 454
Title: Late Quaternary sediment-accumulation rates within the inner basins of the California continental borderland in support of geologic hazard evaluation
Title: Earth science in the urban ocean; the Southern California continental borderland
Author(s): Normark, William R.McGann, Mary M.Sliter, Ray W.
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: 117-139
Published: 2009
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 54
Accession Number: 2009-074426
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 7 tables, sketch maps
N32°30'00" - N34°30'00", W121°00'00" - W117°00'00"
Secondary Affiliation: Bedford Institute of Oceanography, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200940
Program Name: USGSOPNon-USGS publications with USGS authors
Program Name: ODPOcean Drilling Program
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