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Serial ruptures of the San Andreas fault, Carrizo Plain, California, revealed by three-dimensional excavations

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Serial ruptures of the San Andreas fault, Carrizo Plain, California, revealed by three-dimensional excavations

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dc.contributor.author Jing, Liu Zeng
dc.contributor.author Klinger, Yann
dc.contributor.author Sieh, Kerry
dc.contributor.author Rubin, Charles M.
dc.contributor.author Seitz, Gordon
dc.date.accessioned 2012-09-06T03:15:27Z
dc.date.available 2012-09-06T03:15:27Z
dc.date.copyright 2006
dc.date.issued 2012-09-06
dc.identifier.citation Jing, L. Z., Klinger, Y., Sieh, K., Rubin, C. M., & Seitz, G. (2006). Serial ruptures of the San Andreas fault, Carrizo Plain, California, revealed by three-dimensional excavations. Journal of Geophysical Research, 111.
dc.identifier.issn 0148–0227
dc.identifier.uri http://hdl.handle.net/10220/8476
dc.description.abstract It is poorly known if fault slip repeats regularly through many earthquake cycles. Well-documented measurements of successive slips rarely span more than three earthquake cycles. In this paper, we present evidence of six sequential offsets across the San Andreas fault at a site in the Carrizo Plain, using stream channels as piercing lines. We opened a latticework of trenches across the offset channels on both sides of the fault to expose their subsurface stratigraphy. We can correlate the channels across the fault on the basis of their elevations, shapes, stratigraphy, and ages. The three-dimensional excavations allow us to locate accurately the offset channel pairs and to determine the amounts of motion for each pair. We find that the dextral slips associated with the six events in the last millennium are, from oldest to youngest, ≥5.4 ± 0.6, 8.0 ± 0.5, 1.4 ± 0.5, 5.2 ± 0.6, 7.6 ± 0.4 and 7.9 ± 0.1 m. In this series, three and possibly four of the six offset values are between 7 and 8 m. The common occurrence of 7–8 m offsets suggests remarkably regular, but not strictly uniform, slip behavior. Age constraints for these events at our site, combined with previous paleoseismic investigations within a few kilometers, allow a construction of offset history and a preliminary evaluation of slip- and time-predictable models. The average slip rate over the span of the past five events (between A.D. 1210 and A.D. 1857.) has been 34 mm/yr, not resolvably different from the previously determined late Holocene slip rate and the modern geodetic strain accumulation rate. We find that the slip-predictable model is a better fit than the time-predictable model. In general, earthquake slip is positively correlated with the time interval preceding the event. Smaller offsets coincide with shorter prior intervals and larger offset with longer prior intervals.
dc.format.extent 33 p.
dc.language.iso en
dc.relation.ispartofseries Journal of geophysical research
dc.rights © 2006 American Geophysical Union. This paper was published in Journal of Geophysical Research and is made available as an electronic reprint (preprint) with permission of American Geophysical Union. The paper can be found at the following official URL: http://dx.doi.org/10.1029/2004JB003601. 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.
dc.subject DRNTU::Science::Geology::Volcanoes and earthquakes.
dc.title Serial ruptures of the San Andreas fault, Carrizo Plain, California, revealed by three-dimensional excavations
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1029/2004JB003601
dc.description.version Published version

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