| 宁夏及邻近地区中强地震前小区域应力场的方向变化 |
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| 引用本文： | 赵知军.宁夏及邻近地区中强地震前小区域应力场的方向变化[J].内陆地震,1997,11(2):128-135. |
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| 作者姓名： | 赵知军 |
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| 作者单位： | 宁夏回族自治区地震局!银川，750001，宁夏回族自治区地震局!银川，750001，宁夏回族自治区地震局!银川，750001 |
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| 摘 要： | 利用单台小震初动符号求解宁夏及其邻近地区半年时间窗的小震综合断层面解，发现主压应力方向在中经震前表现出异常形态：１．主压应力方向离开平均值顺时针偏的角度增大；２．单台记录的Ｐ波初动符号在中强震前趋于一致；３；主压应务Ｐ轴的仰角在中强震前有所增大。
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| 关 键 词： | 地震前兆 应力场 方向变化 中强震 宁夏 |
DIRECTIONAL CHANGE OF SMALL AREA STRESS FIELD BEFORE MODERATE-STRONG EARTHQUAKES IN NINQXIA AND ITS NEIGHBORING REGIONS |
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| Zhao Zhijun, Liu Xiujing, Ma Heqing.DIRECTIONAL CHANGE OF SMALL AREA STRESS FIELD BEFORE MODERATE-STRONG EARTHQUAKES IN NINQXIA AND ITS NEIGHBORING REGIONS[J].Inland Earthquake,1997,11(2):128-135. |
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| Authors: | Zhao Zhijun Liu Xiujing Ma Heqing |
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| Institution: | Seismological Burcau of Ninxia Hui Autonomous Region Yinchuan 750001 |
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| Abstract: | While using small earthquake first motion signs of single station to solve the syntheticfaultplane solution within half a year in Ningxia and neighboring areas,it is found that the di-rection of principal compressive stress field shows three kinds of abnormal manners: (1 )An-gle increase of principal compressive field direction apart from average value turning coock-wise(towards east); (2)The first motion signs of head waves (P, Pn)recorded by single sta-tion approach the identity ; (3)Some increase in the angle of elevation of principal compressivestress P axis before moderate-strong earthquakes. |
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| Keywords: | Fault plane solution Principal stress orientation P wave first motion Moderate-strong earthquake |
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