Volume 23 Issue 6
Dec.  2017
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FU Guochao, LÜ Tongyan, SUN Dongxia, et al., 2017. SEISMOGENIC STRUCTURE OF THE Ms7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN. Journal of Geomechanics, 23 (6): 799-809.
Citation: FU Guochao, LÜ Tongyan, SUN Dongxia, et al., 2017. SEISMOGENIC STRUCTURE OF THE Ms7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN. Journal of Geomechanics, 23 (6): 799-809.

SEISMOGENIC STRUCTURE OF THE Ms7.0 EARTHQUAKE ON AUGUST 8, 2017 IN JIUZHAIGOU, SICHUAN

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  • Received: 2017-08-30
  • Published: 2017-12-01
  • An Ms7.0 earthquake struck Jiuzhaigou county at 9:19 pm on August 8, 2017 in Aba Prefecture of Sichuan Province. The epicenter was located in the intersection area of the Huya fault on the east boundary of the Bayan Har block and the Tazang fault on the east section of the East Kunlun fault, with complicated seismotectonic settings. This earthquake caused damages to houses and roads, and landslides collapsed. According to the data of high-resolution satellite image interpretation, the measurement data of tectonic deformation and dating data, it shows that the east section of the Tazang fault has been dominated by left-lateral strike-slip accompanied with thrust faulting; the horizontal sliding rate is about 2.7~4.1 mm/yr, and the vertical sliding rate is about 0.56~0.6 mm/yr. Combined with the distribution of major earthquake and aftershocks and the results of major earthquake source mechanism solution, a three-dimensional seismic structure model is established. The analysis reveals that this earthquake belongs to strike-slip earthquake with the main rupture angle of 57°~77°. It was caused by the eastward push of the Qinghai-Tibet Plateau mass, and the seismogenic fault may be a branch of the Tazang fault. According to the study of historical earthquakes, active faults and deformation observation, the Bayan Kala block has significant strong earthquake tectonic background, and it is necessary to continue to pay attention to the seismic activity and deformation of the boundary of the block.

     

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