| On Shear-wave Splitting in Tangshan Region |
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| 作者姓名： | Sun Yong and Zheng SihuaSeismological Bureau of Liaoning Province Shenyang China Center for Analysis and Prediction SSB Beijing China |
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| 作者单位： | Sun Yong and Zheng SihuaSeismological Bureau of Liaoning Province，Shenyang 110031，China Center for Analysis and Prediction，SSB，Beijing 100036，China |
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| 摘 要： | Shear-wave splitting in Tangshan region is studied by using digital seismic data.Analyzing 3-component digital seismic data in Tangshan strong ground motion array,it is found that almost all earthquakes occurred during 1982 to 1984 have significant shear-wave splitting.The polarization directions of faster shear waves in 7 stations are near EW,which are consistent with the axis of maximum principal compressive stress obtained from earthquake fault mechanisms and geodetic surveys.The crack densities of the 7 stations are roughly estimated,0.019 for TS01,TS02 and TS15,0.015 for TS03,TS07 and TS18 and 0.024 for TS19,by using the average time delay of slow shear-wave at the 7 stations.
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On Shear-wave Splitting in Tangshan Region |
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| Sun Yong and Zheng SihuaSeismological Bureau of Liaoning Province,Shenyang ,China Center for Analysis and Prediction,SSB,Beijing ,China.On Shear-wave Splitting in Tangshan Region[J].Earthquake Research in China,1995(2). |
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| Authors: | Sun Yong and Zheng SihuaSeismological Bureau of Liaoning Province Shenyang China Center for Analysis and Prediction SSB Beijing China |
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| Institution: | Sun Yong and Zheng SihuaSeismological Bureau of Liaoning Province,Shenyang 110031,China Center for Analysis and Prediction,SSB,Beijing 100036,China |
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| Abstract: | Shear-wave splitting in Tangshan region is studied by using digital seismic data.Analyzing 3-component digital seismic data in Tangshan strong ground motion array,it is found that almost all earthquakes occurred during 1982 to 1984 have significant shear-wave splitting.The polarization directions of faster shear waves in 7 stations are near EW,which are consistent with the axis of maximum principal compressive stress obtained from earthquake fault mechanisms and geodetic surveys.The crack densities of the 7 stations are roughly estimated,0.019 for TS01,TS02 and TS15,0.015 for TS03,TS07 and TS18 and 0.024 for TS19,by using the average time delay of slow shear-wave at the 7 stations. |
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| Keywords: | S-wave fission Tangshan China |
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