| 北部湾6.1,6.2级地震序列的环境应力场 |
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| 引用本文： | 李仕升,李柳英.北部湾6.1,6.2级地震序列的环境应力场[J].华南地震,1999,19(2):25-31. |
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| 作者姓名： | 李仕升 李柳英 |
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| 作者单位： | 广西壮族自治区地震局!南宁530022 |
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| 摘 要： | 应用Ｐ波初动半周期直接测定环境剪应力值的方法，测定了北部湾６．１，６．２级地震前后中小地震的环境剪应力值τ０，由此分析了北部湾地震过程的环境应力场特征。结果表明，北部湾６．１级地震后平均剪应力值较高，达１８ＭＰａ左右；６．２级地震及两次５级余震后剪应力值下降很快，降至目前的６ＭＰａ左右。在此基础上对北部湾地震活动趋势作了初步分析。
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| 关 键 词： | 应力场 震源过程 环境剪应力 北部湾 地震序列 |
Ambient stress field of the M 6 1 and 6 2 earthquakes sequence in Beibuwan |
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| Yang Shisheng,Li Liuying.Ambient stress field of the M 6 1 and 6 2 earthquakes sequence in Beibuwan[J].South China Journal of Seismology,1999,19(2):25-31. |
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| Authors: | Yang Shisheng Li Liuying |
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| Abstract: | In this paper, the ambient shear stress values of the middle and the small earthquakes around the M 6 1 and 6 2 earthquakes in Beibuwan are determined by using the method of the P-wave first impulse half period. Therefore, the ambient stress field characteristics in Beibuwan earthquakes sequence are analyzed. The results show that the ambient shear stress average value is about 18 MPa after the M 6 1 earthquake in Beibuwan ,and the value decrease rapidly to 6 0 MPa after the M 6 2 and two M 5 0 earthquakes. Based on these, the tendency of seismic activity in the future in Beibuwan is estimated |
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| Keywords: | Stress field Source process Ambient shear stress Beibuwan earthquake |
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