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Geodetic slip model of the 3 September 2016 M (sub w) 5.8 Pawnee, Oklahoma, earthquake; evidence for fault-zone collapse

Frederick F. Pollitz, Charles Wicks, Martin Schoenball, William L. Ellsworth and Mark Murray
Geodetic slip model of the 3 September 2016 M (sub w) 5.8 Pawnee, Oklahoma, earthquake; evidence for fault-zone collapse
Seismological Research Letters (May 2017) 88 (4): 983-993

Abstract

The 3 September 2016 M (sub w) 5.8 Pawnee earthquake in northern Oklahoma is the largest earthquake ever recorded in Oklahoma. The coseismic deformation was measured with both Interferometric Synthetic Aperture Radar and Global Positioning System (GPS), with measureable signals of order 1 cm and 1 mm, respectively. We derive a coseismic slip model from Sentinel-1A and Radarsat 2 interferograms and GPS static offsets, dominated by distributed left-lateral strike slip on a primary west-northwest-east-southeast-trending subvertical plane, whereas strike slip is concentrated near the hypocenter (5.6 km depth), with maximum slip of approximately 1 m located slightly east and down-dip of the hypocenter. Based on systematic misfits of observed interferogram line-of-sight (LoS) displacements, with LoS based on shear-dislocation models, a few decimeters of fault-zone collapse are inferred in the hypocentral region where coseismic slip was the largest. This may represent the postseismic migration of large volumes of fluid away from the high-slip areas, made possible by the creation of a temporary high-permeability damage zone around the fault.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 88
Serial Issue: 4
Title: Geodetic slip model of the 3 September 2016 M (sub w) 5.8 Pawnee, Oklahoma, earthquake; evidence for fault-zone collapse
Affiliation: U. S. Geological Survey, Menlo Park, CA, United States
Pages: 983-993
Published: 20170503
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 40
Accession Number: 2017-043776
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N36°00'00" - N36°34'60", W97°00'00" - W96°30'00"
Secondary Affiliation: Stanford University, USA, United StatesNew Mexico Institute of Mining and Technology, USA, United States
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
Program Name: USGSOPNon-USGS publications with USGS authors
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