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Foreshock Seismicity Suggests Gradual Differential Stress Increase in the Months Prior to the 3 September 2016 M w 5.8 Pawnee Earthquake

2017; Seismological Society of America; Volume: 88; Issue: 4 Linguagem: Inglês

10.1785/0220170007

1938-2057

J. I. Walter, J. C. Chang, P. Dotray,

Seismic Waves and Analysis

Research Article| May 03, 2017 Foreshock Seismicity Suggests Gradual Differential Stress Increase in the Months Prior to the 3 September 2016 Mw 5.8 Pawnee Earthquake Jacob I. Walter; Jacob I. Walter aOklahoma Geological Survey, University of Oklahoma, 100 E. Boyd, Norman, Oklahoma 73019‐0628 U.S.A., jwalter@ou.educAlso at the Institute for Geophysics, University of Texas at Austin, 10100 Burnet Road, Building 196, Austin, Texas 78758 U.S.A. Search for other works by this author on: GSW Google Scholar Jefferson C. Chang; Jefferson C. Chang aOklahoma Geological Survey, University of Oklahoma, 100 E. Boyd, Norman, Oklahoma 73019‐0628 U.S.A., jwalter@ou.edudAlso at the ConocoPhillips School of Geology and Geophysics, University of Oklahoma, 100 E. Boyd Street, Norman, Oklahoma 73109 U.S.A. Search for other works by this author on: GSW Google Scholar Peter J. Dotray Peter J. Dotray bInstitute for Geophysics, University of Texas at Austin, 10100 Burnet Road, Building 196, Austin, Texas 78758 U.S.A. Search for other works by this author on: GSW Google Scholar Author and Article Information Jacob I. Walter aOklahoma Geological Survey, University of Oklahoma, 100 E. Boyd, Norman, Oklahoma 73019‐0628 U.S.A., jwalter@ou.educAlso at the Institute for Geophysics, University of Texas at Austin, 10100 Burnet Road, Building 196, Austin, Texas 78758 U.S.A. Jefferson C. Chang aOklahoma Geological Survey, University of Oklahoma, 100 E. Boyd, Norman, Oklahoma 73019‐0628 U.S.A., jwalter@ou.edudAlso at the ConocoPhillips School of Geology and Geophysics, University of Oklahoma, 100 E. Boyd Street, Norman, Oklahoma 73109 U.S.A. Peter J. Dotray bInstitute for Geophysics, University of Texas at Austin, 10100 Burnet Road, Building 196, Austin, Texas 78758 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): 1032–1039. https://doi.org/10.1785/0220170007 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 Jacob I. Walter, Jefferson C. Chang, Peter J. Dotray; Foreshock Seismicity Suggests Gradual Differential Stress Increase in the Months Prior to the 3 September 2016 Mw 5.8 Pawnee Earthquake. Seismological Research Letters 2017;; 88 (4): 1032–1039. doi: https://doi.org/10.1785/0220170007 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 was the largest earthquake in Oklahoma history. To determine the relationship with nearby seismic activity and whether there were any precursory foreshocks to the event, we analyze a dataset comprising regional seismometers throughout Oklahoma, including the Oklahoma Geological Survey statewide network. We use a matched‐filter technique to identify potential missing earthquakes before and after the mainshock. This technique utilizes cataloged waveforms as templates that, when correlated against continuous waveforms, are able to identify repeating or nearby earthquakes. As shown in other studies, the aftershocks roughly fall along an east‐southeast‐trending linear belt that illuminates a previously unknown fault. We utilize the augmented seismicity catalog to draw two main conclusions. From standard statistical seismological methods, we deduce that the b‐value decreased prior to the Pawnee mainshock; previous work suggests that b‐value and differential stress are anticorrelated. The b‐value result suggests the differential stress along the fault that eventually ruptured was gradually increasing in the few months leading up to the mainshock. During the aftershock period, we infer an Omori–Utsu p‐value close to 1, typical for most tectonic events. Although the prolonged seismicity in the months leading up to the event may be a hallmark of induced earthquakes and may help decipher induced earthquakes from natural earthquakes, the rate of aftershocks is indistinguishable from natural tectonic earthquakes though deficient in larger aftershocks. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.