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GEOREF RECORD

Century-long average time intervals between earthquake ruptures of the San Andreas Fault in the Carrizo Plain, California

Sinan O. Akciz, Lisa Grant Ludwig, J. Ramon Arrowsmith and Olaf Zielke
Century-long average time intervals between earthquake ruptures of the San Andreas Fault in the Carrizo Plain, California
Geology (Boulder) (September 2010) 38 (9): 787-790

Abstract

Paleoseismological data constrain the age, location, and associated magnitude of past surface-rupturing earthquakes; these are critical parameters for developing and testing fault behavior models and characterizing seismic hazard. We present new earthquake evidence and radiocarbon analyses that refine the chronology of the six most recent earthquakes that ruptured the south-central San Andreas fault in the Carrizo Plain (California, United States) at the Bidart Fan site. Modeled 95 percentile ranges of the earthquakes prior to the A.D. 1857 earthquake are A.D. 1631-1823, 1580-1640, 1510-1612, 1450-1475, and 1360-1452. The average time interval between the last six earthquakes that ruptured the San Andreas fault in the Carrizo Plain is 88+ or -41 yr. This is less than the time since the most recent A.D. 1857 earthquake, less than all reported average intervals of prehistoric earthquakes along the entire San Andreas fault, and significantly shorter than the 235 yr average used in recent seismic hazard evaluations. The new chronological data combined with recent slip studies imply that the magnitudes of the earthquakes that ruptured the southern San Andreas fault in the Carrizo Plain since ca. A.D. 1360 were variable, and suggest that the widely held view of rare but great surface rupturing earthquakes along this portion of the southern San Andreas fault should be reevaluated.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 38
Serial Issue: 9
Title: Century-long average time intervals between earthquake ruptures of the San Andreas Fault in the Carrizo Plain, California
Affiliation: University of California, Irvine, Program in Public Health, Irvine, CA, United States
Pages: 787-790
Published: 201009
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 26
Accession Number: 2010-077589
Categories: SeismologyQuaternary geologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010222
Illustration Description: illus. incl. sect., 1 table, sketch map
N35°04'60" - N35°30'00", W120°00'00" - W119°45'00"
Secondary Affiliation: Arizona State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201041
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