Evidence for eight great earthquake-subsidence events detected with ground-penetrating radar, Willapa barrier, Washington

Research Article| February 01, 1996 Evidence for eight great earthquake-subsidence events detected with ground-penetrating radar, Willapa barrier, Washington Richard A. Meyers; Richard A. Meyers 1Department of Geography, University of Calgary, Calgary, Alberta T2N 1N4, Canada Search for other works by this author on: GSW Google Scholar Derald G. Smith; Derald G. Smith 1Department of Geography, University of Calgary, Calgary, Alberta T2N 1N4, Canada Search for other works by this author on: GSW Google Scholar Harry M. Jol; Harry M. Jol 2Department of Geography, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada Search for other works by this author on: GSW Google Scholar Curt D. Peterson Curt D. Peterson 3Department of Geology, Portland State University, P.O. Box 751, Portland, Oregon 97207 Search for other works by this author on: GSW Google Scholar Author and Article Information Richard A. Meyers 1Department of Geography, University of Calgary, Calgary, Alberta T2N 1N4, Canada Derald G. Smith 1Department of Geography, University of Calgary, Calgary, Alberta T2N 1N4, Canada Harry M. Jol 2Department of Geography, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada Curt D. Peterson 3Department of Geology, Portland State University, P.O. Box 751, Portland, Oregon 97207 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 (2): 99–102. https://doi.org/10.1130/0091-7613(1996)024<0099:EFEGES>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 Email Permissions Search Site Citation Richard A. Meyers, Derald G. Smith, Harry M. Jol, Curt D. Peterson; Evidence for eight great earthquake-subsidence events detected with ground-penetrating radar, Willapa barrier, Washington. Geology 1996;; 24 (2): 99–102. doi: https://doi.org/10.1130/0091-7613(1996)024<0099:EFEGES>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 new approach to detect Holocene subduction-zone earthquakes combines the results from ground-penetrating radar (GPR), Vibracores, and accelerator mass spectrometry (AMS) dates from a barrier spit located west of Willapa Bay, southwest Washington. GPR data show a 10-m-thick facies of beach sand within which we identify, and Vibracores confirm, beach-parallel, wave-eroded, buried scarps mantled with multiple beds of magnetite. The eight GPR-detected buried scarps are interpreted to be eroded by minor transgressions caused by instantaneous barrier subsidence during earthquakes associated with the Juan de Fuca plate subducting under the North American plate. Of these scarps, four have been AMS dated at 300, 1110, 2540, and 4250 (radiocarbon) yr B.P. No datable material has yet been found for the other four radar-detected scarps, but we interpolate and extrapolate dates of 1800, 3400, 5000, and 5800 yr B.P. 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.