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Ni Hongyu, Shen Xiaoqi, Hong Dequan, Li Junhui, Zheng Haigang, Zhao Peng. 2015: Characteristics of the ML3.9 Jinzhai, Anhui, earthquake swarm sequence in 2014. Acta Seismologica Sinica, 37(6): 925-936. DOI: 10.11939/jass.2015.06.004
Citation: Ni Hongyu, Shen Xiaoqi, Hong Dequan, Li Junhui, Zheng Haigang, Zhao Peng. 2015: Characteristics of the ML3.9 Jinzhai, Anhui, earthquake swarm sequence in 2014. Acta Seismologica Sinica, 37(6): 925-936. DOI: 10.11939/jass.2015.06.004
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Characteristics of the ML3.9 Jinzhai, Anhui, earthquake swarm sequence in 2014

  • 1.

    Earthquake Administration of Anhui Province, Hefei 230031, China

  • 2.

    National Geophysical Observatory at Mengcheng, Anhui Mengcheng 230026, China

  • 3.

    First Crust Monitoring and Application Center, China Earthquake Administration, Tianjin 300180, China

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  • Received Date: April 22, 2015
  • Revised Date: August 30, 2015
  • Published Date: October 31, 2015
    Graphical Abstract
    • Abstract
  • This paper relocated the ML3.9 Jinzhai, Anhui, earthquake sequence in 2014 with double-difference earthquake location algorithm firstly, and then calculated the focal mechanisms of stronger earthquakes of the swarm by using Snoke and CAP methods, respectively. Finally, the spatio-temporal evolutionary characteristics of source parameters were analyzed. The results show that the Jinzhai earthquake swarm sequence was distributed in the dense scope of 2 km×2 km without predominant direction. The focal depth is very shallow, being 3-7 km. In addition, the focal mechanisms of larger earthquakes are basically consistent with each other. The strikes of two nodal planes are separately along the direction of NW and NNE, and the dips of two nodal planes are very high, suggesting the Jinzhai earthquake swarm sequence was caused by strike-slip faulting under the action of horizontally compressed nearly in E-W direction and horizontally extended nearly in N-S direction.
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