Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences
Abstract
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.
- Authors:
-
[1];
[2];
[3];
[1]
- Lawrence Livermore National Laboratory Livermore California USA
- Weston Geophysical Corporation Lexington Massachusetts USA
- University of California Berkeley California USA
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1351639
- Alternate Identifier(s):
- OSTI ID: 1351641; OSTI ID: 1410068
- Report Number(s):
- LLNL-JRNL-714167
Journal ID: ISSN 0094-8276
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Published Article
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Name: Geophysical Research Letters Journal Volume: 44 Journal Issue: 7; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; earthquake apparent stress; earthquake scaling; Oklahoma seismicity
Citation Formats
Walter, William R., Yoo, Seung‐Hoon, Mayeda, Kevin, and Gök, Rengin. Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences. United States: N. p., 2017.
Web. doi:10.1002/2016GL072348.
Walter, William R., Yoo, Seung‐Hoon, Mayeda, Kevin, & Gök, Rengin. Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences. United States. https://doi.org/10.1002/2016GL072348
Walter, William R., Yoo, Seung‐Hoon, Mayeda, Kevin, and Gök, Rengin. Fri .
"Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences". United States. https://doi.org/10.1002/2016GL072348.
@article{osti_1351639,
title = {Earthquake stress via event ratio levels: Application to the 2011 and 2016 Oklahoma seismic sequences},
author = {Walter, William R. and Yoo, Seung‐Hoon and Mayeda, Kevin and Gök, Rengin},
abstractNote = {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.},
doi = {10.1002/2016GL072348},
journal = {Geophysical Research Letters},
number = 7,
volume = 44,
place = {United States},
year = {Fri Apr 14 00:00:00 EDT 2017},
month = {Fri Apr 14 00:00:00 EDT 2017}
}
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