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Characteristics of induced/triggered earthquakes during the startup phase of the Guy-Greenbrier earthquake sequence in north-central Arkansas

Paul O. Ogwari, Stephen P. Horton and Scott Ausbrooks
Characteristics of induced/triggered earthquakes during the startup phase of the Guy-Greenbrier earthquake sequence in north-central Arkansas
Seismological Research Letters (May 2016) 87 (3): 620-630

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 approximately 1000 earthquakes having M (sub D) > approximately 2.0, illuminated the approximately 13 km fault. We present an updated catalog of 17,395 earthquakes that is complete between 0< or =M (sub L) < or =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 M (sub D) >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 approximately 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 ( approximately 3 km<z<7.5 km). Earthquake size distribution varies along the fault, with most M (sub L) >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 approximately 1500 m depth).


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 87
Serial Issue: 3
Title: Characteristics of induced/triggered earthquakes during the startup phase of the Guy-Greenbrier earthquake sequence in north-central Arkansas
Affiliation: University of Memphis, Center for Earthquake Research and Information, Memphis, TN, United States
Pages: 620-630
Published: 201605
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 30
Accession Number: 2016-056517
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N35°12'00" - N35°17'60", W92°24'00" - W92°17'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201627
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