Late Quaternary deformation, Saddle Mountains anticline, south-central Washington

Research Article| December 01, 1996 Late Quaternary deformation, Saddle Mountains anticline, south-central Washington M. W. West; M. W. West 1Michael W. West & Associates, Inc., P.O. Box 696, Castle Rock, Colorado 80104 Search for other works by this author on: GSW Google Scholar F. X. Ashland; F. X. Ashland 1Michael W. West & Associates, Inc., P.O. Box 696, Castle Rock, Colorado 80104 Search for other works by this author on: GSW Google Scholar A. J. Busacca; A. J. Busacca 2W. 300 Mohr Street, Palouse, Washington 99161 Search for other works by this author on: GSW Google Scholar G. W. Berger; G. W. Berger 3Quaternary Sciences Center, Desert Research Institute, Reno, Nevada 89506 Search for other works by this author on: GSW Google Scholar M. E. Shaffer M. E. Shaffer 46837 N.E. New Brooklyn Road, Bainbridge Island, Washington 98110 Search for other works by this author on: GSW Google Scholar Author and Article Information M. W. West 1Michael W. West & Associates, Inc., P.O. Box 696, Castle Rock, Colorado 80104 F. X. Ashland 1Michael W. West & Associates, Inc., P.O. Box 696, Castle Rock, Colorado 80104 A. J. Busacca 2W. 300 Mohr Street, Palouse, Washington 99161 G. W. Berger 3Quaternary Sciences Center, Desert Research Institute, Reno, Nevada 89506 M. E. Shaffer 46837 N.E. New Brooklyn Road, Bainbridge Island, Washington 98110 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1996) 24 (12): 1123–1126. https://doi.org/10.1130/0091-7613(1996)024<1123:LQDSMA>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation M. W. West, F. X. Ashland, A. J. Busacca, G. W. Berger, M. E. Shaffer; Late Quaternary deformation, Saddle Mountains anticline, south-central Washington. Geology 1996;; 24 (12): 1123–1126. doi: https://doi.org/10.1130/0091-7613(1996)024<1123:LQDSMA>2.3.CO;2 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 Grabens and beheaded streams above a subjacent thrust fault illuminate late Quaternary deformation on the north limb of the Saddle Mountains anticline, Yakima fold belt, Washington. Geologic mapping and trenches excavated across a scarp on the north flank of a 13-km-long graben and a ± 5-m-high scarp north of the graben, confirm that deformation is related to coseismic slip on the underlying Saddle Mountains fault. Graben development began ca. 100 ka and continued into the Holocene. At least 6.5 m of vertical displacement in a ca. 20–40 ka paleosol yields minimum normal fault slip rates of 0.16–0.33 mm/yr. Assuming that normal slip in the hanging wall above the daylighting fault tip is related to primary reverse slip on the fault, resolution of throw on the 30°-dipping Saddle Mountains fault yields minimum slip of 13 m and minimum slip rates of 0.33–0.65 mm/yr, 2.3–9.4 times greater than slip rates used in a recent seismic hazard analysis for the Hanford Reservation. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.