Abstract
Research Article| August 01, 1998 Fore-arc migration in Cascadia and its neotectonic significance Ray E. Wells; Ray E. Wells 1U.S. Geological Survey, M.S. 975, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Craig S. Weaver; Craig S. Weaver 2U.S. Geological Survey at University of Washington, Box 351650, Seattle, Washington 98195 Search for other works by this author on: GSW Google Scholar Richard J. Blakely Richard J. Blakely 3U.S. Geological Survey, M.S. 989, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information Ray E. Wells 1U.S. Geological Survey, M.S. 975, 345 Middlefield Road, Menlo Park, California 94025 Craig S. Weaver 2U.S. Geological Survey at University of Washington, Box 351650, Seattle, Washington 98195 Richard J. Blakely 3U.S. Geological Survey, M.S. 989, 345 Middlefield Road, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1998) 26 (8): 759–762. https://doi.org/10.1130/0091-7613(1998)026<0759:FAMICA>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 Ray E. Wells, Craig S. Weaver, Richard J. Blakely; Fore-arc migration in Cascadia and its neotectonic significance. Geology 1998;; 26 (8): 759–762. doi: https://doi.org/10.1130/0091-7613(1998)026<0759:FAMICA>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 Neogene deformation, paleomagnetic rotations, and sparse geodetic data suggest the Cascadia fore arc is migrating northward along the coast and breaking up into large rotating blocks. Deformation occurs mostly around the margins of a large, relatively aseismic Oregon coastal block composed of thick, accreted seamount crust. This 400-km-long block is moving slowly clockwise with respect to North America about a Euler pole in eastern Washington, thus increasing convergence rates along its leading edge near Cape Blanco, and creating an extensional volcanic arc on its trailing edge. Northward movement of the block breaks western Washington into smaller, seismically active blocks and compresses them against the Canadian Coast Mountains restraining bend. Arc-parallel transport of fore-arc blocks is calculated to be up to 9 mm/yr, sufficient to produce damaging earthquakes in a broad deformation zone along block margins. 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.
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