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Title: Spatial and Temporal Variations in the Moment Tensor Solutions of the 2008 Wenchuan Earthquake Aftershocks and Their Tectonic Implications

Abstract

Following the mainshock of the 2008 M8 Wenchuan Earthquake, there were more than 300 M L ≥ 4.0 aftershocks that occurred between 12 May 2008 and 8 September 2010. We analyzed here the broadband waveforms for these events and found 160 events with sufficient signal-to-noise levels to invert for seismic moment tensors. Considering the length of the activated fault and the distances to the recording stations, four velocity models were employed to account for variability in crustal structure. The moment tensor solutions show considerable variations with a mixture of mainly reverse and strike-slip mechanisms and a small number of normal events and ambiguous events. We analyzed the spatial and temporal distribution of the aftershocks and their mechanism types to characterize the structure and the deformation occurring in the Longmen Shan fold and thrust belt. Our results suggest that the stress is very complex at the Longmen Shan fault zone. The moment tensors have both a spatial segmentation with two major categories of the moment tensor of thrust and strike slip; and a temporal pattern that the majority of the aftershocks gradually migrated to thrust-type events. The variability of aftershock mechanisms is a strong indication of significant tectonic release and stressmore » reorganization that activated numerous small faults in the system.« less

Authors:
ORCiD logo [1];  [2];  [3];  [1];  [1]; ORCiD logo [4];  [1]; ORCiD logo [5]
  1. Beijing Earthquake Agency (China)
  2. Univ. of California, Berkeley, CA (United States). Berkeley Seismological Lab.
  3. China Univ. of Petroleum, Beijing (China). Unconventional Natural Gas Inst.
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Macquarie Univ., North Ryde, NSW (Australia). ARC Centre of Excellence from Core to Crust Fluid Systems; Univ. of Western Australia, Perth, WA (Australia). Centre for Exploration Targeting; Geological Survey of Western Australia, East Perth, WA (Australia)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Beijing Earthquake Agency (China); China Univ. of Petroleum, Beijing (China)
Sponsoring Org.:
USDOE; National Natural Science Foundation of China (NNSFC); China Earthquake Administration (CEA); China Scholarship Council
OSTI Identifier:
1513154
Report Number(s):
LLNL-JRNL-771048
Journal ID: ISSN 0278-7407; 960868
Grant/Contract Number:  
AC52-07NA27344; 41604045; 41474087; XH16004Y
Resource Type:
Accepted Manuscript
Journal Name:
Tectonics
Additional Journal Information:
Journal Volume: 37; Journal Issue: 3; Journal ID: ISSN 0278-7407
Publisher:
Wiley/American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; aftershock sequence; moment tensor solution; broadband waveforms; Wenchuan earthquake

Citation Formats

Lin, X., Dreger, D., Ge, H., Xu, P., Wu, M., Chiang, A., Zhao, G., and Yuan, H. Spatial and Temporal Variations in the Moment Tensor Solutions of the 2008 Wenchuan Earthquake Aftershocks and Their Tectonic Implications. United States: N. p., 2018. Web. doi:10.1002/2017TC004764.
Lin, X., Dreger, D., Ge, H., Xu, P., Wu, M., Chiang, A., Zhao, G., & Yuan, H. Spatial and Temporal Variations in the Moment Tensor Solutions of the 2008 Wenchuan Earthquake Aftershocks and Their Tectonic Implications. United States. doi:10.1002/2017TC004764.
Lin, X., Dreger, D., Ge, H., Xu, P., Wu, M., Chiang, A., Zhao, G., and Yuan, H. Sat . "Spatial and Temporal Variations in the Moment Tensor Solutions of the 2008 Wenchuan Earthquake Aftershocks and Their Tectonic Implications". United States. doi:10.1002/2017TC004764. https://www.osti.gov/servlets/purl/1513154.
@article{osti_1513154,
title = {Spatial and Temporal Variations in the Moment Tensor Solutions of the 2008 Wenchuan Earthquake Aftershocks and Their Tectonic Implications},
author = {Lin, X. and Dreger, D. and Ge, H. and Xu, P. and Wu, M. and Chiang, A. and Zhao, G. and Yuan, H.},
abstractNote = {Following the mainshock of the 2008 M8 Wenchuan Earthquake, there were more than 300 ML ≥ 4.0 aftershocks that occurred between 12 May 2008 and 8 September 2010. We analyzed here the broadband waveforms for these events and found 160 events with sufficient signal-to-noise levels to invert for seismic moment tensors. Considering the length of the activated fault and the distances to the recording stations, four velocity models were employed to account for variability in crustal structure. The moment tensor solutions show considerable variations with a mixture of mainly reverse and strike-slip mechanisms and a small number of normal events and ambiguous events. We analyzed the spatial and temporal distribution of the aftershocks and their mechanism types to characterize the structure and the deformation occurring in the Longmen Shan fold and thrust belt. Our results suggest that the stress is very complex at the Longmen Shan fault zone. The moment tensors have both a spatial segmentation with two major categories of the moment tensor of thrust and strike slip; and a temporal pattern that the majority of the aftershocks gradually migrated to thrust-type events. The variability of aftershock mechanisms is a strong indication of significant tectonic release and stress reorganization that activated numerous small faults in the system.},
doi = {10.1002/2017TC004764},
journal = {Tectonics},
number = 3,
volume = 37,
place = {United States},
year = {2018},
month = {3}
}

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Figures / Tables:

Table 1 Table 1: Comparison of Wenchuan aftershock moment tensor results. H(cat) is the source depth from the China National Seismic Network, CEA. H(MT) is the modeled source depth from inversion.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.