Research Article| September 01, 2010 Uncertainties in slip-rate estimates for the Mission Creek strand of the southern San Andreas fault at Biskra Palms Oasis, southern California W.M. Behr; W.M. Behr † 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA †E-mail: behr@usc.edu Search for other works by this author on: GSW Google Scholar D.H. Rood; D.H. Rood 2Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94550, USA Search for other works by this author on: GSW Google Scholar K.E. Fletcher; K.E. Fletcher 3Department of Earth and Planetary Science, University of California, 307 McCone Hall, Berkeley, California 94720-4767, USA Search for other works by this author on: GSW Google Scholar N. Guzman; N. Guzman 4Department of Earth Sciences, California State University, 18111 Nordhoff Street, Northridge, California 91330, USA Search for other works by this author on: GSW Google Scholar R. Finkel; R. Finkel 2Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94550, USA Search for other works by this author on: GSW Google Scholar T.C. Hanks; T.C. Hanks 5U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA Search for other works by this author on: GSW Google Scholar K.W. Hudnut; K.W. Hudnut 6U.S. Geological Survey, 525 South Wilson Avenue, Pasadena, California 91106, USA Search for other works by this author on: GSW Google Scholar K.J. Kendrick; K.J. Kendrick 6U.S. Geological Survey, 525 South Wilson Avenue, Pasadena, California 91106, USA Search for other works by this author on: GSW Google Scholar J.P. Platt; J.P. Platt 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA Search for other works by this author on: GSW Google Scholar W.D. Sharp; W.D. Sharp 7Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709, USA Search for other works by this author on: GSW Google Scholar R.J. Weldon; R.J. Weldon 8Department of Geological Sciences, 1272 University of Oregon, Eugene, Oregon 97403, USA Search for other works by this author on: GSW Google Scholar J.D. Yule J.D. Yule 4Department of Earth Sciences, California State University, 18111 Nordhoff Street, Northridge, California 91330, USA Search for other works by this author on: GSW Google Scholar Author and Article Information W.M. Behr † 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA D.H. Rood 2Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94550, USA K.E. Fletcher 3Department of Earth and Planetary Science, University of California, 307 McCone Hall, Berkeley, California 94720-4767, USA N. Guzman 4Department of Earth Sciences, California State University, 18111 Nordhoff Street, Northridge, California 91330, USA R. Finkel 2Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, California 94550, USA T.C. Hanks 5U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025, USA K.W. Hudnut 6U.S. Geological Survey, 525 South Wilson Avenue, Pasadena, California 91106, USA K.J. Kendrick 6U.S. Geological Survey, 525 South Wilson Avenue, Pasadena, California 91106, USA J.P. Platt 1Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA W.D. Sharp 7Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, California 94709, USA R.J. Weldon 8Department of Geological Sciences, 1272 University of Oregon, Eugene, Oregon 97403, USA J.D. Yule 4Department of Earth Sciences, California State University, 18111 Nordhoff Street, Northridge, California 91330, USA †E-mail: behr@usc.edu Publisher: Geological Society of America Received: 02 Feb 2009 Revision Received: 24 Aug 2009 Accepted: 26 Aug 2009 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2010 Geological Society of America GSA Bulletin (2010) 122 (9-10): 1360–1377. https://doi.org/10.1130/B30020.1 Article history Received: 02 Feb 2009 Revision Received: 24 Aug 2009 Accepted: 26 Aug 2009 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation W.M. Behr, D.H. Rood, K.E. Fletcher, N. Guzman, R. Finkel, T.C. Hanks, K.W. Hudnut, K.J. Kendrick, J.P. Platt, W.D. Sharp, R.J. Weldon, J.D. Yule; Uncertainties in slip-rate estimates for the Mission Creek strand of the southern San Andreas fault at Biskra Palms Oasis, southern California. GSA Bulletin 2010;; 122 (9-10): 1360–1377. doi: https://doi.org/10.1130/B30020.1 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 SocietyGSA Bulletin Search Advanced Search Abstract This study focuses on uncertainties in estimates of the geologic slip rate along the Mission Creek strand of the southern San Andreas fault where it offsets an alluvial fan (T2) at Biskra Palms Oasis in southern California. We provide new estimates of the amount of fault offset of the T2 fan based on trench excavations and new cosmogenic 10Be age determinations from the tops of 12 boulders on the fan surface. We present three alternative fan offset models: a minimum, a maximum, and a preferred offset of 660 m, 980 m, and 770 m, respectively. We assign an age of between 45 and 54 ka to the T2 fan from the 10Be data, which is significantly older than previously reported but is consistent with both the degree of soil development associated with this surface, and with ages from U-series geochronology on pedogenic carbonate from T2, described in a companion paper by Fletcher et al. (this volume). These new constraints suggest a range of slip rates between ∼12 and 22 mm/yr with a preferred estimate of ∼14–17 mm/yr for the Mission Creek strand of the southern San Andreas fault. Previous studies suggested that the geologic and geodetic slip-rate estimates at Biskra Palms differed. We find, however, that considerable uncertainty affects both the geologic and geodetic slip-rate estimates, such that if a real discrepancy between these rates exists for the southern San Andreas fault at Biskra Palms, it cannot be demonstrated with available data. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
