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Li Yan’e, Wang Linying, Zheng Xuyao. 2014: Restudy of the variation of vP/vS before and after the Wenchuan earthquake. Acta Seismologica Sinica, 36(3): 425-432. DOI: 10.3969/j.issn.0253-3782.2014.03.008
Citation: Li Yan’e, Wang Linying, Zheng Xuyao. 2014: Restudy of the variation of vP/vS before and after the Wenchuan earthquake. Acta Seismologica Sinica, 36(3): 425-432. DOI: 10.3969/j.issn.0253-3782.2014.03.008
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Restudy of the variation of vP/vS before and after the Wenchuan earthquake

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

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  • Received Date: February 05, 2013
  • Revised Date: December 24, 2013
  • Published Date: April 30, 2014
    Graphical Abstract
    • Abstract
  • Based on the seismic phase data recorded by Sichuan Digital Network from 1990 to 2012, this paper analyzes the variation of wave velocity ratio vP/vS before and after the 2008 Wenchuan MS8.0 earthquake by using Wadati method of single station and multi-earthquake. We carefully winnow the date and select 13 stations with relatively abundant and continuous data. The results show that the wave velocity ratio obviously decreased at four stations before the Wenchuan earthquake in the western side of middle-northern Longmenshan fault, which lasts for almost seven years; while the ratio did not show abnormal varaiton at the other nine stations. The position of the four stations with anomalous wave velocity ratio are consistent with Wenchuan earthquake seismogenic zone, providing sufficient evidence for whether the temporal variation process of crustal media characteristics exists before the Wenchuan earthquake.
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    • References (8)
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