Fracture and Regional Stress-Related Upper Crustal Azimuthal Anisotropy in the Vicinity of the 2016 M5.1 Fairview, Oklahoma, Earthquake

Abstract

To examine potential correlations between wastewater injection and spatial-temporal distribution of upper crustal anisotropy, we conduct shear wave splitting analysis using local S waves recorded by six stations in the vicinity of the 2016 M5.1 earthquake. the event is generally considered to have been induced by injection. a total of 405 pairs of high-quality measurements were obtained using local events that occurred in the S-wave window. for raypaths mainly traveling through the fault zone of the M5.1 earthquake, the observed fast orientations are mostly parallel to the faults or the duplex structures and thus may reflect fault induced anisotropy. in contrast, for raypaths not dominantly traveling through the fault zone, E-W fast orientations are pervasively observed which are consistent with the regional maximum compressive stress. Possible temporal variations in the normalized delay time may indicate the process from crack opening under pore pressure originating from the wastewater injection to crack healing.

Department(s)

Geosciences and Geological and Petroleum Engineering

International Standard Serial Number (ISSN)

1949-4645; 1052-3812

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Society of Exploration Geophysicists, All rights reserved.

Publication Date

14 Dec 2023

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