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Title: Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2016GL072348· OSTI ID:1351639
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1]
  1. Lawrence Livermore National Laboratory Livermore California USA
  2. Weston Geophysical Corporation Lexington Massachusetts USA
  3. University of California Berkeley California USA
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Abstract We develop a new methodology for determining earthquake stress drop and apparent stress values via spectral ratio asymptotic levels. With sufficient bandwidth, the stress ratio for a pair of events can be directly related to these low‐ and high‐frequency levels. This avoids the need to assume a particular spectral model and derive stress drop from cubed corner frequency measures. The method can be applied to spectral ratios for any pair of closely related earthquakes and is particularly well suited for coda envelope methods that provide good azimuthally averaged, point‐source measures. We apply the new method to the 2011 Prague and 2016 Pawnee earthquake sequences in Oklahoma. The sequences show stress scaling with size and depth, with the largest events having apparent stress levels near 1 MPa and smaller and/or shallower events having systematically lower stress values.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1351639
Alternate ID(s):
OSTI ID: 1351641; OSTI ID: 1410068
Report Number(s):
LLNL-JRNL-714167
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 44 Journal Issue: 7; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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58 GEOSCIENCES
earthquake apparent stress
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Oklahoma seismicity