| 唐山地区剪切波分裂研究 |
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| 引用本文： | 孙勇,郑斯华.唐山地区剪切波分裂研究[J].中国地震,1993,9(1):60-67. |
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| 作者姓名： | 孙勇 郑斯华 |
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| 作者单位： | 辽宁省地震局，国家地震局分析预报中心 中国沈阳 110031，中国北京 100036 |
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| 摘 要： | 本文利用唐山地区的数字化地震资料,研究了唐山地区的剪切波分裂现象。通过对唐山强地面运动台网中七个台的三分向数字化记录资料的研究发现,1982—1984年发生的大部分地震都有较明显的S波分裂现象。七个台站的初至分裂S波的极化方向都在近东西方向,这与该地区的主压应力场方向相一致。各台慢S波延时的平均值在0.005—0.008s/km之间,由此可以粗略地估计得到各个台站的裂纹密度为:0.019(TS01,TS02,TS15),0.015(TS03,TS07,TS18)和0.024(T19)。
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| 关 键 词： | 地震 剪切波 应力 唐山地区 |
On Shear-wave Splitting in Tangshan Region |
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| Sun Yong.On Shear-wave Splitting in Tangshan Region[J].Earthquake Research in China,1993,9(1):60-67. |
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| Authors: | Sun Yong |
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| Abstract: | Shear-wave splitting in Tangshan region is studied by using digital weismic data. Analysing 3-com-ponent digital seismic data in Tangshan strong ground motion array, it is found that almost all earthquakes occurring from 1982 to 1984 have significant shear-wave splitting. The polarization directions of faster S-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 relatively reliable delay times of splitting shear-waves. |
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| Keywords: | Shear-wave splitting Polarization direction Delay times Direction of the maximum principal compressive stress Tangshan region |
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