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Title: Imaging Stress and Faulting Complexity Through Earthquake Waveform Similarity

Abstract

While the rupture processes of nearby earthquakes are often highly similar, characterizing the differences can provide insight into the complexity of the stress field and fault network in which the earthquakes occur. Here we perform a comprehensive analysis of earthquake waveform similarity to characterize rupture processes in the vicinity of Ridgecrest, California. We quantify how similar each earthquake is to neighboring events through cross correlation of full waveforms. The July 2019 Ridgecrest mainshocks impose a step reduction in earthquake similarity, which suggests variability in the residual stress field and activated fault structures on length scales of hundreds of meters or less. Interestingly, among these aftershocks, we observe coherent spatial variations of earthquake similarity along the mainshock rupture trace, and document antisimilar aftershock pairs with waveforms that are nearly identical but with reversed polarity. These observations provide new, high-resolution constraints on stress transfer and faulting complexity throughout the Ridgecrest earthquake sequence.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
OSTI Identifier:
1604008
Alternate Identifier(s):
OSTI ID: 1592202
Report Number(s):
LA-UR-19-30627
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 47; Journal Issue: 1; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; earth sciences; earthquake similarity; waveform cross correlation; crustal stress; fault structure; slip mechanism

Citation Formats

Trugman, Daniel Taylor, Ross, Zachary E., and Johnson, Paul Allan. Imaging Stress and Faulting Complexity Through Earthquake Waveform Similarity. United States: N. p., 2020. Web. doi:10.1029/2019GL085888.
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Trugman, Daniel Taylor, Ross, Zachary E., & Johnson, Paul Allan. Imaging Stress and Faulting Complexity Through Earthquake Waveform Similarity. United States. doi:https://doi.org/10.1029/2019GL085888
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Trugman, Daniel Taylor, Ross, Zachary E., and Johnson, Paul Allan. Fri . "Imaging Stress and Faulting Complexity Through Earthquake Waveform Similarity". United States. doi:https://doi.org/10.1029/2019GL085888. https://www.osti.gov/servlets/purl/1604008.
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@article{osti_1604008,
title = {Imaging Stress and Faulting Complexity Through Earthquake Waveform Similarity},
author = {Trugman, Daniel Taylor and Ross, Zachary E. and Johnson, Paul Allan},
abstractNote = {While the rupture processes of nearby earthquakes are often highly similar, characterizing the differences can provide insight into the complexity of the stress field and fault network in which the earthquakes occur. Here we perform a comprehensive analysis of earthquake waveform similarity to characterize rupture processes in the vicinity of Ridgecrest, California. We quantify how similar each earthquake is to neighboring events through cross correlation of full waveforms. The July 2019 Ridgecrest mainshocks impose a step reduction in earthquake similarity, which suggests variability in the residual stress field and activated fault structures on length scales of hundreds of meters or less. Interestingly, among these aftershocks, we observe coherent spatial variations of earthquake similarity along the mainshock rupture trace, and document antisimilar aftershock pairs with waveforms that are nearly identical but with reversed polarity. These observations provide new, high-resolution constraints on stress transfer and faulting complexity throughout the Ridgecrest earthquake sequence.},
doi = {10.1029/2019GL085888},
journal = {Geophysical Research Letters},
number = 1,
volume = 47,
place = {United States},
year = {2020},
month = {1}
}
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DOI:  https://doi.org/10.1029/2019GL085888
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