Structural transect of the western Transverse Ranges, California: Implications for lithospheric kinematics and seismic risk evaluation

Abstract

Research Article| August 01, 1988 Structural transect of the western Transverse Ranges, California: Implications for lithospheric kinematics and seismic risk evaluation Jay Namson; Jay Namson 1ARCO Oil and Gas Company, 2300 Plano Parkway, Plano, Texas 75075 Search for other works by this author on: GSW Google Scholar Thom Davis Thom Davis 23937 Roderick Road, Los Angeles, California 90065 Search for other works by this author on: GSW Google Scholar Geology (1988) 16 (8): 675–679. https://doi.org/10.1130/0091-7613(1988)016<0675:STOTWT>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 Jay Namson, Thom Davis; Structural transect of the western Transverse Ranges, California: Implications for lithospheric kinematics and seismic risk evaluation. Geology 1988;; 16 (8): 675–679. doi: https://doi.org/10.1130/0091-7613(1988)016<0675:STOTWT>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 A retrodeformable cross section that integrates surface and subsurface data across the western Transverse Ranges, California, illustrates an actively developing fold and thrust belt that began forming at 2-3 Ma. High-level thrusts are interpreted to root in a mid-crustal detachment at 12-15 km depth, which coincides with the maximum depth of earthquakes. The cross section documents 53 km of convergence above the mid-crustal detachment; dividing this by the time since onset of deformation yields convergence rates of 17.6-26.5 mm/yr. The high-density lithospheric anomaly beneath the Transverse Ranges is related to subduction of lower crust and lithosphere below the mid-crustal detachment to balance the shallow crustal shortening. Thrust ramps coincide with zones of high seismicity in the Transverse Ranges; this suggests that ramp regions have the highest potential for compressive earthquake events: e.g., the recent Whittier Narrows earthquake of October 1, 1987 (M1 = 5.9), occurred along the eastern part of a ramp zone. 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.