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Miocene–Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA

2017; Geological Society of America; Volume: 130; Issue: 3-4 Linguagem: Inglês

10.1130/b31783.1

1943-2674

Lydia Staisch, Harvey M. Kelsey, Brian L. Sherrod, Andreas Möller, James B. Paces, Richard J. Blakely, Richard Styron,

High-pressure geophysics and materials

Research Article| October 10, 2017 Miocene–Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA Lydia Staisch; Lydia Staisch † 1Geology, Minerals, Energy, and Geophysics Science Center, U.S. Geological Survey, Menlo Park, California 94025, USA2Earthquake Science Center, U.S. Geological Survey, University of Washington, Seattle, Washington 98195, USA †lstaisch@usgs.gov Search for other works by this author on: GSW Google Scholar Harvey Kelsey; Harvey Kelsey 3Department of Geology, Humboldt State University, Arcata, California 95521, USA Search for other works by this author on: GSW Google Scholar Brian Sherrod; Brian Sherrod 2Earthquake Science Center, U.S. Geological Survey, University of Washington, Seattle, Washington 98195, USA Search for other works by this author on: GSW Google Scholar Andreas Möller; Andreas Möller 4Department of Geology, University of Kansas, Lawrence, Kansas 66045, USA Search for other works by this author on: GSW Google Scholar James Paces; James Paces 5Geoscience and Environmental Change Science Center, U.S. Geological Survey, Denver, Colorado 80225, USA Search for other works by this author on: GSW Google Scholar Richard Blakely; Richard Blakely 1Geology, Minerals, Energy, and Geophysics Science Center, U.S. Geological Survey, Menlo Park, California 94025, USA Search for other works by this author on: GSW Google Scholar Richard Styron Richard Styron 6Earth Analysis, Seattle, Washington 98105, USA7Global Earthquake Model Foundation, Pavia 27100, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Lydia Staisch † 1Geology, Minerals, Energy, and Geophysics Science Center, U.S. Geological Survey, Menlo Park, California 94025, USA2Earthquake Science Center, U.S. Geological Survey, University of Washington, Seattle, Washington 98195, USA Harvey Kelsey 3Department of Geology, Humboldt State University, Arcata, California 95521, USA Brian Sherrod 2Earthquake Science Center, U.S. Geological Survey, University of Washington, Seattle, Washington 98195, USA Andreas Möller 4Department of Geology, University of Kansas, Lawrence, Kansas 66045, USA James Paces 5Geoscience and Environmental Change Science Center, U.S. Geological Survey, Denver, Colorado 80225, USA Richard Blakely 1Geology, Minerals, Energy, and Geophysics Science Center, U.S. Geological Survey, Menlo Park, California 94025, USA Richard Styron 6Earth Analysis, Seattle, Washington 98105, USA7Global Earthquake Model Foundation, Pavia 27100, Italy †lstaisch@usgs.gov Publisher: Geological Society of America Received: 27 Feb 2017 Revision Received: 05 Jul 2017 Accepted: 16 Aug 2017 First Online: 10 Oct 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2017 Geological Society of America GSA Bulletin (2018) 130 (3-4): 411–437. https://doi.org/10.1130/B31783.1 Article history Received: 27 Feb 2017 Revision Received: 05 Jul 2017 Accepted: 16 Aug 2017 First Online: 10 Oct 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Lydia Staisch, Harvey Kelsey, Brian Sherrod, Andreas Möller, James Paces, Richard Blakely, Richard Styron; Miocene–Pleistocene deformation of the Saddle Mountains: Implications for seismic hazard in central Washington, USA. GSA Bulletin 2017;; 130 (3-4): 411–437. doi: https://doi.org/10.1130/B31783.1 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 Yakima fold province, located in the backarc of the Cascadia subduction zone, is a region of active strain accumulation and deformation distributed across a series of fault-cored folds. The geodetic network in central Washington has been used to interpret large-scale N-S shortening and westward-increasing strain; however, geodetic data are unable to resolve shortening rates across individual structures in this low-strain-rate environment. Resolving fault geometries, slip rates, and timing of faulting in the Yakima fold province is critically important to seismic hazard assessment for nearby infrastructure and population centers.The Saddle Mountains anticline is one of the most prominent Yakima folds. It is unique within the Yakima fold province in that the syntectonic strata of the Ringold Formation are preserved and provide a record of deformation and drainage reorganization. Here, we present new stratigraphic columns, U-Pb zircon tephra ages, U-series caliche ages, and geophysical modeling that constrain two line-balanced and retrodeformed cross sections. These new constraints indicate that the Saddle Mountains anticline has accommodated 1.0–1.3 km of N-S shortening since 10 Ma, that shortening increases westward along the anticline, and that the average slip rate has increased 6-fold since 6.8 Ma. Provenance analysis suggests that the source terrane for the Ringold Formation was similar to that of the modern Snake River Plain. Using new slip rates and structural constraints, we calculate the strain accumulation time, interpretable as a recurrence interval, for earthquakes on the Saddle Mountains fault and find that large-magnitude earthquakes could rupture along the Saddle Mountains fault every 2–11 k.y. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.