Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (6): 1894-1903.doi: 10.13278/j.cnki.jjuese.201706306

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Upper Crustal Velocity Structure in Qianguo M5.8 Earthquake Region

Lu Yanhong, Wu Zhaoying, Ding Guang, Fu Qi, Zhang Fan   

  1. Earthquake Administration of Jilin Province, Changchun 130117, China
  • Received:2017-03-07 Online:2017-11-26 Published:2017-11-26
  • Supported by:
    Supported by Science and Technology Development Plan of Jilin Province, China(20150204002SF, 20130204052SF)

Abstract: For further studying seismic activity of Qianguo in Jilin Province,we collected 405 seismic events recorded by 17 permanent and temporary stations from October 2013 to February 2015, and total 2 218 high-quality P wave arrival times and 2 166 high-quality S wave arrival times. We used double-difference tomography method to invert the upper crust P and S wave velocity structure in Qianguo region (in the region of epicentral distance range of 0-200 km). The tomography results show that the velocity structure beneath thestudy area exhibits an obvious feature of stratification, the P wave velocity varies from 5.8 km/s to 7.2 km/s,and the S wave velocity is from 3.4 km/s to 4.0 km/s, with a small change on the vP/vS ratio. A low velocity zone beneath thestudy area is found with a trend of NE direction and a nearly vertical steep dip angle, and it extends as deep as 15 km. The earthquake cluster is located in the low P wave and low S wave velocity region corresponding to a low vP/vS ratio;so we suggest that the tectonic intensity of this region is weak, and prone toearthquake under the influence of the stress field derived from the subduction of Western Pacific slab.

Key words: Qianguo seismic zone, double-difference tomography, velocity structure, upper crustal

CLC Number: 

  • P631.4
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