Coulomb Stress Interactions during the Mw 5.8 Pawnee Sequence

Colin Pennington; Xiaowei Chen

doi:10.1785/0220170011

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Research Article| May 03, 2017

Coulomb Stress Interactions during the $M_{w}$ 5.8 Pawnee Sequence

Colin Pennington;

Colin Pennington

^a

Sarkeys Energy Center, The University of Oklahoma, 100 East Boyd Street, RM 710, Norman, Oklahoma 73019 U.S.A., [email protected]

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Xiaowei Chen

^a

Sarkeys Energy Center, The University of Oklahoma, 100 East Boyd Street, RM 710, Norman, Oklahoma 73019 U.S.A., [email protected]

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Author and Article Information

Colin Pennington

^a

Sarkeys Energy Center, The University of Oklahoma, 100 East Boyd Street, RM 710, Norman, Oklahoma 73019 U.S.A., [email protected]

Xiaowei Chen

^a

Sarkeys Energy Center, The University of Oklahoma, 100 East Boyd Street, RM 710, Norman, Oklahoma 73019 U.S.A., [email protected]

Publisher: Seismological Society of America

First Online: 15 Sep 2017

Online ISSN: 1938-2057

Print ISSN: 0895-0695

Seismological Research Letters (2017) 88 (4): 1024–1031.

https://doi.org/10.1785/0220170011

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 $M_{w}$ 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 $M_{w} \geq 3.0$ 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.