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Volume 28 Issue 6
Dec.  2015
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Journal of Southwest Jiaotong University  > 2015  >  28(6): 1055-1060,1073.
LI Ping, BO Jingshan, YUAN Yifan, XIAO Ruijie, LIU Hongshuai. Effects of Jiuxiang Fracture on Abnormal Intensity in Hanyuan during Wenchuan Earthquake[J]. Journal of Southwest Jiaotong University, 2015, 28(6): 1055-1060,1073. doi: 10.3969/j.issn.0258-2724.2015.06.011
Citation: LI Ping, BO Jingshan, YUAN Yifan, XIAO Ruijie, LIU Hongshuai. Effects of Jiuxiang Fracture on Abnormal Intensity in Hanyuan during Wenchuan Earthquake[J]. Journal of Southwest Jiaotong University, 2015, 28(6): 1055-1060,1073. doi: 10.3969/j.issn.0258-2724.2015.06.011
shu

Effects of Jiuxiang Fracture on Abnormal Intensity in Hanyuan during Wenchuan Earthquake

doi: 10.3969/j.issn.0258-2724.2015.06.011
  • Received Date: 18 Oct 2014
  • Publish Date: 25 Dec 2015
    Abstract
  • In order to explore the causes for abnormal intensity occurring in Hanyuan Town during the Wenchuan earthquake, a typical two-dimensional model for seismic response analyses was established based on the scientific investigation and site reconnaissance of earthquake damages in Hanyuan Town and the seismogeologic and topographic maps, and the effects of Jiuxiang fracture on abnormal seismic damage in Hanyuan Town were analyzed by the finite difference method and the transmitting boundary theory. The research results show that there is a certain effect of Jiuxiang fracture on abnormal intensity in Hanyuan Town, and the ground motion may be amplified significantly in the band of 4 to 8 Hz, the peak ground motion acceleration being increased about 9%. This frequency band is the same as the vibration frequency of buildings in Hanyuan Town. Damages can be aggravated by the increased surface ground motion and resonance effect, this is one of the main reasons of high abnormal intensity in Hanyuan Town. So a non-causative fault has certain amplification effect on surface ground motion, the effect should be considered in project location and anti-seismic designs.

     

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