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Department of Geological Sciences
Arizona State University
P.O. Box 1404
Tempe, Arizona 82587-1404
jeri.young{at}asu.edu;
ramon.Arrowsmith{at}asu.edu;
bgootee{at}asu.edu
(J.J.Y., J R.A., B.G.)
Istituto Nazionale di Geofisica e Vulcanologia
Via di Vigna Murata 605
00143, Rome, Italy
colini{at}ingv.it
(L.C.)
Department of Environmental Analysis and Design and
Analysis
University of California, Irvine
Irvine, California 92697-7070
lgrant{at}uci.edu
(L.B.G.)
A paleoseismic study conducted along the Cholame segment of the San Andreas
fault provides evidence for three earthquakes and the amount of lateral offset
for the most recent event (1857 Fort Tejon earthquake). Excavations at the Las
Yeguas (LY4) site include five fault-perpendicular, two parallel, and several
hand-dug trenches. Abruptly truncated sand and silt layers that are not
correlative across the fault zone constrain the timing of the penultimate
event (L2) between cal. A.D. 1030-1300 and 1390-1460. Vertical offset,
shearing, and fracturing of silty sand and gravel units that overlie L2 and
historical artifacts that bracket the timing of the MRE (L1) provide evidence
that the most recent ground-rupturing event, L1, occurred between cal. A.D.
1390-1460 and 
1865. L1 is likely the 1857 Fort Tejon earthquake. Tectonic
silt-filled fractures that dissect historic gray-tan silt and sand suggest a
ground shaking or a triggered slip event (L0), which occurred after L1.
Three-dimensional excavation of an alluvial fan edge (unit 4) indicates that
3.0 ± 0.70 m of near-fault brittle slip occurred during the 1857
earthquake at this site.
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Displacement across the Cholame Segment of the San Andreas Fault between 1855 and 1893 from Cadastral Surveys Bulletin of the Seismological Society of America, October 1, 2002; 92(7): 2659 - 2669.
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