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GEOREF RECORD

Recent rupture history of the San Andreas Fault southeast of Cholame in the northern Carrizo Plain, California

Elizabeth M. Stone, Lisa B. Grant and J. Ramon Arrowsmith
Recent rupture history of the San Andreas Fault southeast of Cholame in the northern Carrizo Plain, California
Bulletin of the Seismological Society of America (April 2002) 92 (3): 983-997

Abstract

We conducted a paleoseismic study on the San Andreas fault (SAF) southeast of Cholame, California, to investigate the record of earthquakes along an 80-km paleoseismic data gap between Parkfield and the Carrizo Plain. At the LY4 site, located 37.5 km southeast of Highway 46 along the SAF, we excavated a fault perpendicular trench on the distal end of an alluvial fan that emanates from the Temblor Mountains to the northeast. We found evidence of three and possibly four ruptures recorded within the stratigraphy. The only age constraints are radiocarbon dates on a paleosol three units (50 cm) below the oldest event horizon and the presence of recently introduced exotic pollen species in an upper unit. The radiocarbon dates indicate there have been at least three surface-rupturing events at the LY4 site since cal. A.D. 1058-1291. Exotic (historic) pollen in the top of a unit possibly cut by the youngest event suggests that an earthquake affected at the LY4 site close to A.D. 1873-1874.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 92
Serial Issue: 3
Title: Recent rupture history of the San Andreas Fault southeast of Cholame in the northern Carrizo Plain, California
Affiliation: Arizona State University, Department of Geological Sciences, Tempe, AZ, United States
Pages: 983-997
Published: 200204
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 32
Accession Number: 2002-061882
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, geol. sketch maps
N35°43'60" - N35°43'60", W120°16'00" - W120°16'00"
Secondary Affiliation: University of California at Irvine, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200220
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