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Coulomb stress interactions during the M (sub w) 5.8 Pawnee sequence

Colin Pennington and Xiaowei Chen
Coulomb stress interactions during the M (sub w) 5.8 Pawnee sequence
Seismological Research Letters (May 2017) 88 (4): 1024-1031

Abstract

We investigate the stress interaction between the Watchorn, Labette, and Sooner Lake fault systems and the effect of precursory activities on the 3 September 2016 M (sub w) 5.8 Pawnee earthquake. We obtain fault-plane solutions for earthquakes with sufficient azimuthal coverage using the HASH algorithm, and then perform coulomb stress analysis on both seismogenic faults and individual nodal planes. Our results found that the three M (sub w) > or =3.0 foreshocks exerted a cumulative coulomb stress change increase of 0.68-1.98 bars at the mainshock hypocenter and also promoted failure for most aftershocks within 2 km of the mainshock. The coulomb stress change of 5 bars exerted by the mainshock also promoted failure for most aftershocks within the conjugate fault system. The results suggest that earthquake interaction should be fully considered in hazard assessment for induced seismicity.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 88
Serial Issue: 4
Title: Coulomb stress interactions during the M (sub w) 5.8 Pawnee sequence
Affiliation: University of Oklahoma, Sarkeys Energy Center, Norman, OK, United States
Pages: 1024-1031
Published: 20170503
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 28
Accession Number: 2017-043781
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N33°30'00" - N37°00'00", W99°00'00" - W95°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201724
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