Late Quaternary slip history of the Mill Creek strand of the San Andreas fault in San Gorgonio Pass, southern California: The role of a subsidiary left-lateral fault in strand switching

Research Article| May 01, 2015 Late Quaternary slip history of the Mill Creek strand of the San Andreas fault in San Gorgonio Pass, southern California: The role of a subsidiary left-lateral fault in strand switching K.J. Kendrick; K.J. Kendrick † 1U.S. Geological Survey, Earthquake Science Center, Pasadena, California 91106, USA †E-mail: kendrick@usgs.gov. Search for other works by this author on: GSW Google Scholar J.C. Matti; J.C. Matti 2U.S. Geological Survey, Geology, Minerals, Energy, and Geophysics Science Center, Tucson, Arizona 85719, USA Search for other works by this author on: GSW Google Scholar S.A. Mahan S.A. Mahan 3U.S. Geological Survey, Crustal Geophysics and Geochemistry Science Center, Denver, Colorado 80225, USA Search for other works by this author on: GSW Google Scholar Author and Article Information K.J. Kendrick † 1U.S. Geological Survey, Earthquake Science Center, Pasadena, California 91106, USA J.C. Matti 2U.S. Geological Survey, Geology, Minerals, Energy, and Geophysics Science Center, Tucson, Arizona 85719, USA S.A. Mahan 3U.S. Geological Survey, Crustal Geophysics and Geochemistry Science Center, Denver, Colorado 80225, USA †E-mail: kendrick@usgs.gov. Publisher: Geological Society of America Received: 26 Mar 2014 Revision Received: 27 Aug 2014 Accepted: 14 Nov 2014 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2015 Geological Society of America GSA Bulletin (2015) 127 (5-6): 825–849. https://doi.org/10.1130/B31101.1 Article history Received: 26 Mar 2014 Revision Received: 27 Aug 2014 Accepted: 14 Nov 2014 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation K.J. Kendrick, J.C. Matti, S.A. Mahan; Late Quaternary slip history of the Mill Creek strand of the San Andreas fault in San Gorgonio Pass, southern California: The role of a subsidiary left-lateral fault in strand switching. GSA Bulletin 2015;; 127 (5-6): 825–849. doi: https://doi.org/10.1130/B31101.1 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 The fault history of the Mill Creek strand of the San Andreas fault (SAF) in the San Gorgonio Pass region, along with the reconstructed geomorphology surrounding this fault strand, reveals the important role of the left-lateral Pinto Mountain fault in the regional fault strand switching. The Mill Creek strand has 7.1–8.7 km total slip. Following this displacement, the Pinto Mountain fault offset the Mill Creek strand 1–1.25 km, as SAF slip transferred to the San Bernardino, Banning, and Garnet Hill strands. An alluvial complex within the Mission Creek watershed can be linked to palinspastic reconstruction of drainage segments to constrain slip history of the Mill Creek strand. We investigated surface remnants through detailed geologic mapping, morphometric and stratigraphic analysis, geochronology, and pedogenic analysis. The degree of soil development constrains the duration of surface stability when correlated to other regional, independently dated pedons. This correlation indicates that the oldest surfaces are significantly older than 500 ka. Luminescence dates of 106 ka and 95 ka from (respectively) 5 and 4 m beneath a younger fan surface are consistent with age estimates based on soil-profile development. Offset of the Mill Creek strand by the Pinto Mountain fault suggests a short-term slip rate of ∼10–12.5 mm/yr for the Pinto Mountain fault, and a lower long-term slip rate. Uplift of the Yucaipa Ridge block during the period of Mill Creek strand activity is consistent with thermochronologic modeled uplift estimates. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.