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Prehistoric large earthquakes produced by slip on the San Andreas fault at Pallett Creek, California

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Prehistoric large earthquakes produced by slip on the San Andreas fault at Pallett Creek, California

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Title: Prehistoric large earthquakes produced by slip on the San Andreas fault at Pallett Creek, California
Author: Sieh, Kerry
Copyright year: 1978
Abstract: Late Holocene marsh deposits composing a terrace about 55 km northeast of Los Angeles, California, contain geologic evidence of many large seismic events produced by slip on the San Andreas fault since the sixth century A .D. I excavated several trenches into the deposits in order to study this evidence. The principal indicators of past events are (1) sandblows and other effects of liquefaction, (2) the termination of secondary faults at distinct levels within the stratigraphic section, and (3) sedimentary deposits and faulted relationships along the main fault. The effects upon the marsh deposits of six of the eight prehistoric events are comparable to those of the great (Me = 8 1/4 +) 1857event, which is the youngest of the nine events disturbing the strata and is associated with about 4 1/2 m of right lateral slip nearby. Two large events may be smaller than this. Radiocarbon dates indicate that the events occurred in the nineteenth,eighteenth,fifteenth, thirteenth, late twelfth, tenth, ninth, seventh,and sixth centuries A .D. Recurrence intervals average 160 years but vary from 1/2 century to about 3 centuries. The dates may indicate a fairly systematic pattern of occurrence of large earthquakes.
Subject: DRNTU::Science::Geology::Volcanoes and earthquakes.
Type: Journal Article
Series/ Journal Title: Journal of geophysical research
Rights: © 1978 the American Geophysical Union. This paper was published in Journal of Geophysical Research and is made available as an electronic reprint (preprint) with permission of the American Geophysical Union. The paper can be found at the following official DOI: http://dx.doi.org/10.1029/JB083iB08p03907. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Version: Published version

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