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Guo Zhi, Gao Xing, Lu Zhen. 2020: Relocation and focal mechanism inversion for the Changning，Sichuan，earthquake on 7 June 2019. Acta Seismologica Sinica, 42(3): 245-255. DOI: 10.11939/jass.20190132
Citation: Guo Zhi, Gao Xing, Lu Zhen. 2020: Relocation and focal mechanism inversion for the Changning，Sichuan，earthquake on 7 June 2019. Acta Seismologica Sinica, 42(3): 245-255. DOI: 10.11939/jass.20190132
shu

Relocation and focal mechanism inversion for the Changning，Sichuan，earthquake on 7 June 2019

  • 1.

    Institute of Geology，China Earthquake Administration，Beijing 100029，China

  • 2.

    Institute of Geographic Sciences and Natural Resources Research，Chinese Academy of Sciences，Beijing 100101，China

  • 3.

    State Key Laboratory of Resources and Environmental Information System，Chinese Academy of Sciences，Beijing 100101，China

  • 4.

    The Second Monitoring and Application Center，China Earthquake Administration，Xi’an 710054，China

More Information
  • Received Date: August 01, 2019
  • Revised Date: March 25, 2020
  • Available Online: August 16, 2020
  • Published Date: July 20, 2020
    Graphical Abstract
    • Abstract
  • In this study, we apply the double-difference relocation technique and W-phase method to relocate the 2019 Changning, Sichuan, earthquake sequence, and to determine the focal mechanisms of the M＞4.5 aftershocks using the seismic data provided by the Earthquake Catalog System and China Earthquake Networks Center. The relocated epicentral locations of Changning earthquake sequence show a NW-striking dominant narrow belt in the predominant epicentral depth range of 5−10 km with a near vertical seismogenic fault plane. The focal parameters for the main shock of 17 June, 2019 Sichuan Changning earthquake are: strike 12°, dip 50°, strike 139° for the nodal plane Ⅰ , and strike 131°, dip 59°, strike 48° for the nodal plane Ⅱ , focal depth is 7.5 km and moment magnitude is MW5.74. Moreover, the M＞4.5 aftershocks show a similar focal mechanism to the main shock. Combined analyses of the relocated epicentral location, focal mechanisms and tectonic settings suggest that the seismogenic fault of 17 June 2019 Changning main shock could be related to the thrust fault developed in north-eastern wing of NW-SE-striking Changning-Shuanhe anticline.
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