Surface Deformation of North‐Central Oklahoma Related to the 2016Mw 5.8 Pawnee Earthquake from SAR Interferometry Time Series
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Research Article| May 03, 2017 Surface Deformation of North‐Central Oklahoma Related to the 2016 Mw 5.8 Pawnee Earthquake from SAR Interferometry Time Series Eric J. Fielding; Eric J. Fielding aJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109 U.S.A., eric.j.fielding@jpl.nasa.gov Search for other works by this author on: GSW Google Scholar Simran S. Sangha; Simran S. Sangha bDepartment of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, California 90095‐1567 U.S.A. Search for other works by this author on: GSW Google Scholar David P. S. Bekaert; David P. S. Bekaert aJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109 U.S.A., eric.j.fielding@jpl.nasa.gov Search for other works by this author on: GSW Google Scholar Sergey V. Samsonov; Sergey V. Samsonov cCanada Centre for Mapping and Earth Observation, Natural Resources Canada, 560 Rochester Street, Ottawa, Ontario, Canada K1A 0E4 Search for other works by this author on: GSW Google Scholar Jefferson C. Chang Jefferson C. Chang dOklahoma Geological Survey, University of Oklahoma, 100 East Boyd Street, N131, Norman, Oklahoma 73019 U.S.A. Search for other works by this author on: GSW Google Scholar Author and Article Information Eric J. Fielding aJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109 U.S.A., eric.j.fielding@jpl.nasa.gov Simran S. Sangha bDepartment of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, California 90095‐1567 U.S.A. David P. S. Bekaert aJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109 U.S.A., eric.j.fielding@jpl.nasa.gov Sergey V. Samsonov cCanada Centre for Mapping and Earth Observation, Natural Resources Canada, 560 Rochester Street, Ottawa, Ontario, Canada K1A 0E4 Jefferson C. Chang dOklahoma Geological Survey, University of Oklahoma, 100 East Boyd Street, N131, Norman, Oklahoma 73019 U.S.A. Publisher: Seismological Society of America First Online: 15 Sep 2017 Online Issn: 1938-2057 Print Issn: 0895-0695 © Seismological Society of America Seismological Research Letters (2017) 88 (4): 971–982. https://doi.org/10.1785/0220170010 Article history First Online: 15 Sep 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Eric J. Fielding, Simran S. Sangha, David P. S. Bekaert, Sergey V. Samsonov, Jefferson C. Chang; Surface Deformation of North‐Central Oklahoma Related to the 2016 Mw 5.8 Pawnee Earthquake from SAR Interferometry Time Series. Seismological Research Letters 2017;; 88 (4): 971–982. doi: https://doi.org/10.1785/0220170010 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 SocietySeismological Research Letters Search Advanced Search ABSTRACT The 3 September 2016 Mw 5.8 Pawnee earthquake shook a large area of north‐central Oklahoma and was the largest instrumentally recorded earthquake in the state. We processed Synthetic Aperture Radar (SAR) from the Copernicus Sentinel‐1A and Sentinel‐1B and Canadian RADARSAT‐2 satellites with interferometric SAR analysis for the area of north‐central Oklahoma that surrounds Pawnee. The interferograms do not show phase discontinuities that would indicate surface ruptures during the earthquake. Individual interferograms have substantial atmospheric noise caused by variations in radar propagation delays due to tropospheric water vapor, so we performed a time‐series analysis of the Sentinel‐1 stack to obtain a more accurate estimate of the ground deformation in the coseismic time interval and the time variation of deformation before and after the earthquake. The time‐series fit for a step function at the time of the Pawnee shows about 3 cm peak‐to‐peak amplitude of the coseismic surface deformation in the radar line of sight with a spatial pattern that is consistent with fault slip on a plane trending east‐southeast. This fault, which we call the Sooner Lake fault, is parallel to the west‐northwest nodal plane of the U.S. Geological Survey National Earthquake Information Center moment tensor solution. We model the fault plane by fitting hypoDD‐relocated aftershocks aligned in the same trend. Our preferred slip model on this assumed fault plane, allowing only strike‐slip motion, has no slip shallower than 2.3 km depth, an area of moderate slip extending 7 km along strike between 2.3 and 4.5 km depth (which could be due to aftershocks and afterslip), and larger slip between 4.5 and 14 km depth extending about 12 km along strike. The large slip below the 4.5 km depth of our relocated hypocenter indicates that the coseismic rupture propagated down‐dip. The time‐series results do not show significant deformation before or after the earthquake above the high atmospheric noise level within about 40 km of the earthquake rupture. 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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