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Xu Zhiguo, Liang Shanshan, Sheng Shuzhong, Zhang Guangwei, Zou Liye, Zhou Yuanze. 2020: Relocation and source characteristics of the 2019 Changning MS6.0 earthquake sequence. Acta Seismologica Sinica, 42(4): 377-391. DOI: 10.11939/jass.20190170
Citation: Xu Zhiguo, Liang Shanshan, Sheng Shuzhong, Zhang Guangwei, Zou Liye, Zhou Yuanze. 2020: Relocation and source characteristics of the 2019 Changning MS6.0 earthquake sequence. Acta Seismologica Sinica, 42(4): 377-391. DOI: 10.11939/jass.20190170
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Relocation and source characteristics of the 2019 Changning MS6.0 earthquake sequence

  • 1.

    National Marine Environmental Forecasting Center，Beijing 100081，China

  • 2.

    College of Earth and Planetary Sciences，University of Chinese Academy of Sciences，Beijing 100049，China

  • 3.

    Key Laboratory of Computational Geodynamics，University of Chinese Academy of Seiences，Beijing 100049，China

  • 4.

    China Earthquake Networks Center，Beijing 100045，China

  • 5.

    School of Geophysics and Measurement-control Technology，East China University of Technology，Nanchang 330013，China

  • 6.

    State Key Laboratory of Nuclear Resources and Environment，East china Unversity of Technology，Nanchang 330013，China

  • 7.

    National Institute of Natural Hazards，Beijing 100045，China

More Information
  • Received Date: November 24, 2019
  • Revised Date: March 25, 2020
  • Available Online: August 26, 2020
  • Published Date: July 14, 2020
    Graphical Abstract
    • Abstract
  • The double difference earthquake location algorithm is used to relocate the earthquakes occurred in Changning area of Sichuan Province, which recorded by Sichuan regional network from January 1, 2019 to October 20, 2019, 7030 relocation events were obtained, and showing the clearer spatial distribution of Changning MS6.0 earthquake sequence. The average b-value of Changning focal area is calculated with relocated aftershocks catalog, and the seismicity of the earthquake sequence is analyzed. The focal mechanism solutions and centriod depth of the Changning main shock and 4 aftershocks with MS≥5.0 have been inverted with the local full-waveform inversion method, and the seismotectonics of this earthquake sequence was analyzed preliminarily. The main conclusions are as follow: ① The Sichuan Changning aftershocks distribute in a NW−SE trending, and the aftershocks show a trending of deep in the West and shallow in the East, and the frequency of earthquakes in the western part is much higher than that in the eastern part; ② The spatial distribution of b-value shows obvious compression tectonic environment in the Changning area after the occurrence of the earthquake; ③ The main shock and 4 moderate aftershocks occurred at unusual shallow centroid depths, and their focal plane solutions suggest that earthquakes occurred on thrust faults with slightly different strike; ④ It is speculated that the MS6.0 main shock and moderate aftershocks occurred on the preexisting faults, which subjected from a long-term compression force and the earthquake happened when the stress beyond the elastic limit, or the aftershocks generated on the newly generated faults created by mainshock coseismic rupture in Changning anticline area.
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