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Wang Weiping, Yang Jiansi, Peng Chaoyong, Zheng Yu, Xu Zhiqiang, Jiang Xudong. 2019: Velocity structures and aftershock distribution in the source region of the 2017 Jiuzhaigou MS7.0 earthquake. Acta Seismologica Sinica, 41(1): 1-12. DOI: 10.11939/jass.20180058
Citation: Wang Weiping, Yang Jiansi, Peng Chaoyong, Zheng Yu, Xu Zhiqiang, Jiang Xudong. 2019: Velocity structures and aftershock distribution in the source region of the 2017 Jiuzhaigou MS7.0 earthquake. Acta Seismologica Sinica, 41(1): 1-12. DOI: 10.11939/jass.20180058
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Velocity structures and aftershock distribution in the source region of the 2017 Jiuzhaigou MS7.0 earthquake

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

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  • Received Date: April 25, 2018
  • Revised Date: September 05, 2018
  • Available Online: January 16, 2019
  • Published Date: December 31, 2018
    Graphical Abstract
    • Abstract
  • Using the arrival times from the aftershocks of 2017 Jiuzhaigou MS7.0 （MW6.5） earthquake, the P- and S-wave velocity structures in the source region and its adjacent area are obtained by means of the body wave tomography method. The results show that the aftershocks, characterized by NNW-striking, SW-trending and a high dip angle, are mainly concentrated on one side of the low-velocity anomalies at the intersection of high- and low-velocity anomalies. The P- and S-wave velocity structures reveal the differences of crustal property on both sides of the seismogenic fault: the hanging-wall is a high-velocity zone with strong rigidity while the footwall is a low-velocity zone with weak rigidity. According to the distribution of aftershocks and the seismic velocity structure, it can be inferred ultimately that the 2017 Jiu-zhaigou MS7.0 earthquake occurred on the lower interface of the upper crust, following with the rupture propagated in a dramatically deformed area in the upper crust and terminated near the depth of 25 km, and the seismogenic fault has the property of low-velocity hanging-wall and high-velocity footwall.
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