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Wei Zigen, Chu Risheng, Yang Xiaolin, Xie Jun, Tian Zhonghua, Ling Yuan, Dong Feifei. 2019: Crustal structure and seismic activity in the Hanzhong basin and its adjacent areas. Acta Seismologica Sinica, 41(4): 445-458. DOI: 10.11939/jass.20180145
Citation: Wei Zigen, Chu Risheng, Yang Xiaolin, Xie Jun, Tian Zhonghua, Ling Yuan, Dong Feifei. 2019: Crustal structure and seismic activity in the Hanzhong basin and its adjacent areas. Acta Seismologica Sinica, 41(4): 445-458. DOI: 10.11939/jass.20180145
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Crustal structure and seismic activity in the Hanzhong basin and its adjacent areas

  • 1.

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

  • 2.

    State Key Laboratory of Geodesy and Earth’s Dynamics，Wuhan 430077，China

  • 3.

    Shaanxi Earthquake Agency，Xi’an 710068，China

  • 4.

    Institute of Geology，Chinese Academy of Geological Sciences，Beijing 100037，China

  • 5.

    Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China

  • 6.

    Key Laboratory of Earth and Planetary Physics，Chinese Academy of Sciences，Beijing 100029，China

  • 7.

    Jiangxi Earthquake Agency，Nanchang 330039，China

More Information
  • Received Date: December 16, 2018
  • Revised Date: January 28, 2019
  • Available Online: July 25, 2019
  • Published Date: June 30, 2019
    Graphical Abstract
    • Abstract
  • In order to explore the deep dynamic mechanism and seismogenic structural characteristics in the Hanzhong basin, this paper used the ambient noise tomography, joint inversion of the multi-frequency receiver function and surface wave, and the time-depth conversion method of Ps phase from the Moho to image the crustal S-wave velocity and thickness in the Hanzhong basin and its adjacent areas. Then, we further analyzed the relationship between the crustal structure and seismic activity in the studied region. The results show that the sedimentary thickness and velocity of shallow surface are different in different areas of the Hanzhong basin; in some areas of the studied region Moho surface varies gently with a Ps/P ratio less than 0.2. There are few earthquakes in the Hanzhong basin, and the earthquake distribution within 10 km around the basin is mainly controlled by faults. The upper and lower interfaces of the focal depth （4−16 km） correspond to the bottom of the low-velocity region and the top of the high-velocity region, respectively. The uneven sedimentary thickness and gradual crust-mantle transitional zone obtained in this paper are closely related to the triple junction tectonic position of the Hanzhong basin among the Qinling tectonic belt, the Dabashan folded belt and the Tibetan Plateau. The crustal structure and seismicity characteristics obtained in this paper can provide useful information for the study on the deep dynamic mechanism and seismogenic environment in the Hanzhong basin.
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