Codependent histories of the San Andreas and San Jacinto fault zones from inversion of fault displacement rates

Abstract

Research Article| November 01, 2004 Codependent histories of the San Andreas and San Jacinto fault zones from inversion of fault displacement rates Richard A. Bennett; Richard A. Bennett 1Department of Geosciences, University of Arizona, 1040 East 4th Street, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Anke M. Friedrich; Anke M. Friedrich 2Institute of Geosciences, University of Potsdam, Postfach 60 15 53, 14415 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Kevin P. Furlong Kevin P. Furlong 3Department of Geosciences, Pennsylvania State University, 542 Deike Building, University Park, Pennsylvania 16082, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Richard A. Bennett 1Department of Geosciences, University of Arizona, 1040 East 4th Street, Tucson, Arizona 85721, USA Anke M. Friedrich 2Institute of Geosciences, University of Potsdam, Postfach 60 15 53, 14415 Potsdam, Germany Kevin P. Furlong 3Department of Geosciences, Pennsylvania State University, 542 Deike Building, University Park, Pennsylvania 16082, USA Publisher: Geological Society of America Received: 03 May 2004 Revision Received: 19 Jul 2004 Accepted: 23 Jul 2004 First Online: 03 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (11): 961–964. https://doi.org/10.1130/G20806.1 Article history Received: 03 May 2004 Revision Received: 19 Jul 2004 Accepted: 23 Jul 2004 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Richard A. Bennett, Anke M. Friedrich, Kevin P. Furlong; Codependent histories of the San Andreas and San Jacinto fault zones from inversion of fault displacement rates. Geology 2004;; 32 (11): 961–964. doi: https://doi.org/10.1130/G20806.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The displacement histories of the San Jacinto and southernmost San Andreas fault zones are constrained by offset data with ages in the range of 5 Ma to 5 ka. Apparent discrepancies between long- and short-term average displacement rates can be reconciled with a time-variable rate model. In this model, the displacement rate on the San Andreas decelerated from ∼35 mm/yr at 1.5 Ma to as low as 9 ± 4 mm/yr by 90 ka. Over this same time period, the rate on the San Jacinto fault zone accelerated from an initial value of zero to a rate of 26 ± 4 mm/yr. The data also imply that the rate of the San Andreas fault accelerated since ca. 90 ka, from ∼9 mm/yr to the modern rate of 27 ± 4 mm/yr, whereas the San Jacinto decelerated from 26 ± 4 mm/yr to the modern rate of 8 ± 4 mm/yr. The time scale of these changes is significantly longer than the earthquake cycle, but shorter than time scales characteristic of lithospheric-scale dynamics. The emergence of the San Jacinto fault zone ca. 1.5 Ma coincided with the development of a major restraining bend in the San Andreas fault zone, suggesting that the formation of new subparallel faults could be driven by conditions that inhibit displacement on preexisting faults. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.