| 宁夏及邻近地区中强地震前后小震综合断层面解分析 |
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| 引用本文： | 陈素改,李光振.宁夏及邻近地区中强地震前后小震综合断层面解分析[J].华北地震科学,1994,12(2):33-43. |
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| 作者姓名： | 陈素改 李光振 |
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| 作者单位： | 河北省地震局 石家庄050021
(陈素改)，河北省地震局 石家庄050021(李光振) |
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| 摘 要： | 我们对宁夏及邻近地区中强地震前后小震综合断层面解进行了不同时间段及分区的研究，研究结果表明宁夏几次强地震前，小震综合断层面解的Ｐ轴取向有明显的变化，有的偏离区域正常构造庆力场的Ｐ轴主压应力场的方向，有的求不出结果。震前显示异常的最长时间近四年之久。显然，前的这种变化对预报未来中强地震的发生是有参考意义的。同时还表明，中强地震后区域应力场有调整过程。
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| 关 键 词： | 构造应力场 综合断层面解 地震前兆 |
THE SYNTHETICAL STRESS FIELD ANALYSIS OF SMALL EARTHQUAKES BEFORE AND AFTER MODERALTELY STRONG EARTHQUAKES IN NINGXIA AND ITS ADJACENT AREAS |
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| Chen Sugai Li Guangzhen.THE SYNTHETICAL STRESS FIELD ANALYSIS OF SMALL EARTHQUAKES BEFORE AND AFTER MODERALTELY STRONG EARTHQUAKES IN NINGXIA AND ITS ADJACENT AREAS[J].North China Earthquake Sciences,1994,12(2):33-43. |
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| Authors: | Chen Sugai Li Guangzhen |
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| Abstract: | The studies in this paper have.showed that before and after several moderately strong shocks in Ningxia, the strikes of P (main pressure stress) axes have changed distinctly, deviating from the strikes of P axes in normal structural stress field or drawing no conclusions. The longest anomaly before earthquakes can last as long as 4 years. So it is obvious that the variation before shocks can be a significant clew for the moderately strong earthquakes prediction |
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| Keywords: | structural stress field synthetical fault plane solution background stress field seismic precursory stress field |
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