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Lü Miaomiao, Ding Zhifeng, Xu Xiaoming, Li Dahu, Ye Qingdong, Zheng Chen. 2015: Relocations and focal mechanism solutions characteristics of 2012 Yiliang MS5.7 and MS5.6 earthquake sequence. Acta Seismologica Sinica, 37(6): 885-898. DOI: 10.11939/jass.2015.06.001
Citation: Lü Miaomiao, Ding Zhifeng, Xu Xiaoming, Li Dahu, Ye Qingdong, Zheng Chen. 2015: Relocations and focal mechanism solutions characteristics of 2012 Yiliang MS5.7 and MS5.6 earthquake sequence. Acta Seismologica Sinica, 37(6): 885-898. DOI: 10.11939/jass.2015.06.001
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Relocations and focal mechanism solutions characteristics of 2012 Yiliang MS5.7 and MS5.6 earthquake sequence

  • 1.

    Seismic Observation and Geophysical Imaging Laboratory, China Earthquake Administration, Beijing 100081, China

  • 2.

    Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

  • 3.

    Earthquake Administration of Sichuan Province, Chengdu 610041, China

  • 4.

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

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  • Received Date: March 09, 2015
  • Revised Date: May 19, 2015
  • Published Date: October 31, 2015
    Graphical Abstract
    • Abstract
  • Based on the recordings of 17 portable seismographs of ChinArray deployed in Yunnan-Guizhou region, the Yiliang MS5.7 and MS5.6 earthquakes happened on September 7, 2012 and the aftershocks with ML≥1.0 were relocated by double-difference hypocenter location algorithm (hypoDD), and then the focal mechanism solutions of earthquakes (MS≥4.0) were determined by CAP (cut and paste) method. Our results show that the Yiliang MS5.7 mainshock is located at (27.509°N, 103.971°E) with initial rupture depth of 9.7 km. The best double-couple solutions for the Yiliang MS5.7 earthquake have one nodal plane with strike 251°, dip 66°, rake 150°, and another plane with strike 354°, dip 63° and rake 27°. The Yiliang MS5.6 mainshock is relocated at (27.563°N, 104.034°E) with initial rupture depth of 10.0 km, and the mechanism solutions of two nodal planes are 235°, 39°, 147° and 352°, 70°, 56°, respectively. The fault geometry, aftershock distribution characteristics, focal mechanism solutions and the tectonic stress field are in good consistency. Combining with the characteristic of fault kinematic, seismicity and the geological structure, we infer that Yiliang MS5.7 and MS5.6 earthquakes occurred on the NE-striking Shimen fault which is the leading edge of Zhaotong fracture. The shallow focal depth of Yiliang earthquake and the energy release occurred in shallow crust are the major reasons for serious damage in the hypocentral region.
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    • References (39)
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