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Influence of Fault Architecture on Induced Earthquake Sequence Evolution Revealed by High-Resolution Focal Mechanism Solutions

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1029/2022jb025040· OSTI ID:1924407
 [1];  [2];  [1];  [3]
  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. University of Oklahoma, Norman, OK (United States); Texas A & M University, College Station, TX (United States)
  3. Boston University, MA (United States)
+ Show Author Affiliations
The increasing seismicity and improved seismic observation network in recent years provide an opportunity to explore factors that influence the triggering processes, spatiotemporal evolution, and maximum magnitude of induced sequences. We map the fault architecture and stress state of four induced sequences in Oklahoma to determine their influence on the seismicity. We systematically relocate the earthquakes and compute hundreds of focal mechanisms of small to medium events (1.0 < M < 5.1) using various techniques, including machine learning, for the Guthrie, Woodward, Cushing, and Fairview sequences. The detailed fault geometry and spatiotemporal evolution of seismicity and stress states reveal different dominant driving forces for each sequence. In Cushing and Fairview (largest event ≥M5.0), the main fault structures are near-vertical narrow strike-slip faults, with most of the small earthquake fault planes optimally oriented. The two sequences exhibit discontinuous temporal migration but strong earthquake self-driven rupture growth. In Guthrie and Woodward (largest event
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); US Geological Society (USGS); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Fossil Energy and Carbon Management (FECM)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1924407
Alternate ID(s):
OSTI ID: 2441386
Report Number(s):
LA-UR--20-28660; LA-UR--22-25971
Journal Information:
Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 11 Vol. 127; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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