Internal structure of the San Andreas fault at Parkfield, California

Research Article| April 01, 1997 Internal structure of the San Andreas fault at Parkfield, California Martyn J. Unsworth; Martyn J. Unsworth 1Geophysics Program, University of Washington Seattle, Washington 98195 Search for other works by this author on: GSW Google Scholar Peter E. Malin; Peter E. Malin 2Department of Geology, Duke University, Durham, North Carolina 27708 Search for other works by this author on: GSW Google Scholar Gary D. Egbert; Gary D. Egbert 3College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331 Search for other works by this author on: GSW Google Scholar John R. Booker John R. Booker 1Geophysics Program, University of Washington Seattle, Washington 98195 Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (4): 359–362. https://doi.org/10.1130/0091-7613(1997)025<0359:ISOTSA>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Martyn J. Unsworth, Peter E. Malin, Gary D. Egbert, John R. Booker; Internal structure of the San Andreas fault at Parkfield, California. Geology 1997;; 25 (4): 359–362. doi: https://doi.org/10.1130/0091-7613(1997)025<0359:ISOTSA>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 Magnetotelluric and seismic reflection surveys at Parkfield, California, show that the San Andreas fault zone is characterized by a vertical zone of low electrical resistivity. This zone is ≈500 m wide and extends to a depth of ≈4000 m. The low electrical resistivity is attributed to high porosity of saline fluids present in the highly fractured fault zone. The occurrence of microearthquakes and creep in the low resistivity zone is consistent with suggestions that seismicity at Parkfield is fluid driven. 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.