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Science 20 October 1995:
Vol. 270. no. 5235, pp. 447 - 450
DOI: 10.1126/science.270.5235.447
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Reports
Cosmogenic Ages for Earthquake Recurrence Intervals and Debris
Flow Fan Deposition, Owens Valley, California
Paul R. Bierman (1),
Alan R. Gillespie,
Marc W. Caffee
Model exposure ages (beryllium-10, aluminum-26) of boulders on an
offset debris flow fan yield an earthquake recurrence interval between
5800 and 8000  Be: Al years for a strand of
the Owens Valley fault in California, which last ruptured in an
earthquake of moment magnitude >7.5 in 1872. Cosmogenic age estimates
for this and several nearby fan surfaces flanking the eastern Sierra
Nevada are consistent with stratigraphic relations and suggest that
these surfaces were abandoned after 1000, 8000, and 21,000
Be:Al years ago. The wide scatter and
nonconcordance of Be:Al ages on an older
fan surface suggest that boulder erosion and lowering of the fan
surface there have influenced apparent exposure ages.
P. R. Bierman, Department of Geology, University of Vermont,
Burlington, VT 05405, USA.
A. R. Gillespie, Department of Geological Sciences, University of
Washington, Seattle, WA 98195, USA.
M. W. Caffee, Center for Accelerator Mass Spectrometry, Lawrence
Livermore National Laboratory, Livermore, CA 94550, USA.
(1) To whom correspondence should be addressed.
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