Range-front fault scarps of the Sierra El Mayor, Baja California: Formed above an active low-angle normal fault?

Abstract

Research Article| March 01, 1999 Range-front fault scarps of the Sierra El Mayor, Baja California: Formed above an active low-angle normal fault? Gary J. Axen; Gary J. Axen 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90095, USA Search for other works by this author on: GSW Google Scholar John M. Fletcher; John M. Fletcher 2Departamento de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California, Mexico Search for other works by this author on: GSW Google Scholar Eric Cowgill; Eric Cowgill 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90095, USA Search for other works by this author on: GSW Google Scholar Michael Murphy; Michael Murphy 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90095, USA Search for other works by this author on: GSW Google Scholar Paul Kapp; Paul Kapp 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90095, USA Search for other works by this author on: GSW Google Scholar Ian MacMillan; Ian MacMillan 1Department of Earth and Space Sciences, University of California, Los Angeles, California 90095, USA Search for other works by this author on: GSW Google Scholar Ernesto Ramos-Velázquez; Ernesto Ramos-Velázquez 2Departamento de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California, Mexico Search for other works by this author on: GSW Google Scholar Jorge Aranda-Gómez Jorge Aranda-Gómez 3Unidad de Ciencias de la Tierra, Instituto de Geología, Universidad Nacional Autónoma de México, Campus Juriquilla, Querétaro, Querétaro, México Search for other works by this author on: GSW Google Scholar Geology (1999) 27 (3): 247–250. https://doi.org/10.1130/0091-7613(1999)027<0247:RFFSOT>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 Gary J. Axen, John M. Fletcher, Eric Cowgill, Michael Murphy, Paul Kapp, Ian MacMillan, Ernesto Ramos-Velázquez, Jorge Aranda-Gómez; Range-front fault scarps of the Sierra El Mayor, Baja California: Formed above an active low-angle normal fault?. Geology 1999;; 27 (3): 247–250. doi: https://doi.org/10.1130/0091-7613(1999)027<0247:RFFSOT>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 The Cañada David detachment, a west-dipping low-angle normal fault, juxtaposes Pliocene and Pleistocene(?) sedimentary units over sheared bedrock in the Sierra El Mayor, Baja California. Along the west-central range front, the detachment is overlapped by Quaternary alluvial fans that are, in turn, cut by fault scarps up to 7 m high. Map relationships suggest that scarp-forming faults may sole into the detachment at very shallow depth (<200–300 m). Palinspastic restoration of a topographic profile across 15 north-striking scarps suggests that the ratio of net heave to net throw along scarp-forming faults is ∼2, consistent with them soling into a low-angle (∼30°) fault. These 15 scarps may have all formed in one earthquake, with rupture propagation from depth to the near-surface aided by clay gouge along the detachment. The detachment is abandoned in the footwall east of the scarps. 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.