Volume 44 Issue 4
Aug.  2022
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Feng B,Zhu L Y,Hui H,Wang W Q,Chai X C,Ji D J. 2022. Joint iterative inversion of tectonic stress field and fault identification in Yingjiang area. Acta Seismologica Sinica,44(4):619−631 doi: 10.11939/jass.20210027
Citation: Feng B,Zhu L Y,Hui H,Wang W Q,Chai X C,Ji D J. 2022. Joint iterative inversion of tectonic stress field and fault identification in Yingjiang area. Acta Seismologica Sinica44(4):619−631 doi: 10.11939/jass.20210027

Joint iterative inversion of tectonic stress field and fault identification in Yingjiang area

doi: 10.11939/jass.20210027
  • Received Date: 2021-02-23
  • Rev Recd Date: 2021-08-17
  • Available Online: 2022-06-27
  • Publish Date: 2022-08-16
  • There has always been a problem in inversion of tectonic stress field by focal mechanism solution, it is impossible to determine which nodel plane is the correct seismogenic fault plane. The joint iterative stress inversion method can effectively avoid the error caused by incorrect fault selection by identifying the fault instability. In this paper, the focal mechanism solutions of five groups of earthquake sequences in Yingjiang and its adjacent areas are collected, and the tectonic stress field in this area is inversed. The results show that, in Yingjiang area, the main compressive stress is NNE, and the main tensile stress is ESE, which is basically consistent with the previous research results. However, the local stress field is not completely consistent. The strike of the principal stress axis along the Sudian fault extends from north to south, and the angle gradually shifts to the north. In the southwest of Yingjiang, the strike of the principal stress tends to the East, which may be related to the transverse extension of the Dayingjiang fault. In addition, the strike, dip angle, slip angle and friction coefficient of the main seismogenic fault nodal planes of the focal mechanism solutions of five groups of earthquake sequences are identified by stress field inversion. This provides a valuable reference for the future seismic and crustal dynamic changes research in this region.

     

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