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Source mechanism of strong aftershocks (M s⩾5.6) of the 2008/05/12 Wenchuan earthquake and the implication for seismotectonics

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Abstract

Dozens of >M5, hundreds of >M4, and much more >M3 aftershocks occurred after the 2008/05/12 Wenchuan earthquake, which were well recorded by permanent and portable seismic stations. After relocated with P arrival, the >M3 aftershocks show two trends of distribution, with most of the aftershocks located along the north-east strike consistent with Longmenshan fault system, yet there is a north-west trend around the epicenter. It seems that substantially more aftershocks occur in regions with crystalline bedrocks. Then we collected waveform data from National Digital Seismograph Network and regional seismograph network of China, and employed “Cut and Paste” method to obtain focal mechanisms and depths of the big aftershocks (M⩾5.6). While most of those aftershocks show thrust mechanism, there are some strike slip earthquakes in the northern-most end of the rupture. Focal mechanisms show that the events located on the southern part of central Beichuan-Yingxiu Fault (BY) are mainly thrust earthquakes, which is consistent with initial mechanism of the main shock rupture. In the north part the aftershocks along the BY are also dominated by thrust slip, which is quite different from the right slip rupture of the main shock. Around Qingchuan-Pingwu Fault, the focal mechanisms are dominated by right-slip rupture with large depths (∼18 km). So we suspected that in the north part the main shock might rupture on two faults: Beichuan Fault and Qingchuan-Pingwu Fault. The complex pattern of aftershock mechanisms argues for presence of a complicated fault system in the Longmenshan area.

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Authors and Affiliations

  1. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, 430077, China

    Yong Zheng

  2. Institute of Geophysics, Chinese Earthquake Administration, Beijing, 100086, China

    Yong Zheng & ShengJi Wei

  3. Institute of Earthquake Science, Chinese Earthquake Administration, Beijing, 100086, China

    HongSheng Ma

  4. Earthquake Administration of Jiangxi Province, Nanchang, 330039, China

    Jian Lü

  5. School of Earth and Space Science, University of Science and Technology of China, Hefei, 230026, China

    SiDao Ni

  6. Earthquake Administration of Jiangsu Province, Nanjing, 210014, China

    YingChun Li

Authors
  1. Yong Zheng
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  2. HongSheng Ma
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  3. Jian Lü
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  4. SiDao Ni
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Correspondence to HongSheng Ma.

Additional information

Supported by Knowledge Innovation Project of Chinese Academy of Sciences (Grant Nos. KZCX3-SW-153, KZCX2-YW-116-1), National Natural Science Foundation of China (Grant No. 40604004), and National Basic Technology R & D Program (Grant No. 2006BAC01B02-01-02).

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Zheng, Y., Ma, H., Lü, J. et al. Source mechanism of strong aftershocks (M s⩾5.6) of the 2008/05/12 Wenchuan earthquake and the implication for seismotectonics. Sci. China Ser. D-Earth Sci. 52, 739–753 (2009). https://doi.org/10.1007/s11430-009-0074-3

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  • DOI: https://doi.org/10.1007/s11430-009-0074-3

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