Characteristics of Induced/Triggered Earthquakes during the Startup Phase of the Guy–Greenbrier Earthquake Sequence in North–Central Arkansas

Research Article| April 06, 2016 Characteristics of Induced/Triggered Earthquakes during the Startup Phase of the Guy–Greenbrier Earthquake Sequence in North–Central Arkansas Paul O. Ogwari; Paul O. Ogwari aThe Center for Earthquake Research and Information, The University of Memphis, 3892 Central Avenue, Memphis, Tennessee 38152 U.S.A.opogwari@memphis.eduogwaripaul@gmail.com Search for other works by this author on: GSW Google Scholar Stephen P. Horton; Stephen P. Horton aThe Center for Earthquake Research and Information, The University of Memphis, 3892 Central Avenue, Memphis, Tennessee 38152 U.S.A.opogwari@memphis.eduogwaripaul@gmail.com Search for other works by this author on: GSW Google Scholar Scott Ausbrooks Scott Ausbrooks aThe Center for Earthquake Research and Information, The University of Memphis, 3892 Central Avenue, Memphis, Tennessee 38152 U.S.A.opogwari@memphis.eduogwaripaul@gmail.com Search for other works by this author on: GSW Google Scholar Author and Article Information Paul O. Ogwari aThe Center for Earthquake Research and Information, The University of Memphis, 3892 Central Avenue, Memphis, Tennessee 38152 U.S.A.opogwari@memphis.eduogwaripaul@gmail.com Stephen P. Horton aThe Center for Earthquake Research and Information, The University of Memphis, 3892 Central Avenue, Memphis, Tennessee 38152 U.S.A.opogwari@memphis.eduogwaripaul@gmail.com Scott Ausbrooks aThe Center for Earthquake Research and Information, The University of Memphis, 3892 Central Avenue, Memphis, Tennessee 38152 U.S.A.opogwari@memphis.eduogwaripaul@gmail.com Publisher: Seismological Society of America First Online: 14 Jul 2017 Online Issn: 1938-2057 Print Issn: 0895-0695 © 2016 by the Seismological Society of America Seismological Research Letters (2016) 87 (3): 620–630. https://doi.org/10.1785/0220150252 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Paul O. Ogwari, Stephen P. Horton, Scott Ausbrooks; Characteristics of Induced/Triggered Earthquakes during the Startup Phase of the Guy–Greenbrier Earthquake Sequence in North–Central Arkansas. Seismological Research Letters 2016;; 87 (3): 620–630. doi: https://doi.org/10.1785/0220150252 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 Between August 2010 and June 2011, an intense sequence of induced earthquakes occurred along the Guy–Greenbrier fault in central Arkansas due to fluid injection at nearby waste disposal wells. A previous study by Horton (2012), limited to ∼1000 earthquakes having MD>∼2.0, illuminated the ∼13 km fault. We present an updated catalog of 17,395 earthquakes that is complete between 0≤ML≤4.4 between August 2010 and 20 October 2010, with earthquakes located using an updated 1D velocity model for the region. The inclusion of the small‐magnitude events reveals that seismicity starts below the SRE injection well a month earlier than estimated using only MD>2 events. During this period of time, the seismicity migrated from north to south, enhancing the resolution of three joined sections that form the northern ∼7.3 km portion of the fault, which plunges southward. The seismogenic zone covers the lower portion of the Paleozoic sedimentary layers and extends into the crystalline Precambrian basement (∼3 km<z<7.5 km). Earthquake size distribution varies along the fault, with most ML>3 events constrained within the basement. A b‐value of 1.01 was obtained for the updated catalog during this period, with the b‐value varying between 1.37 and 0.72 for different clusters of events. The seismicity pattern at depth is coincident with structural geologic features observed within the Fayetteville Shale (at ∼1500 m depth). You do not have access to this content, please speak to your institutional administrator if you feel you should have access.