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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强震前表现出异常形态：（1）主压应力方向离开平均值顺时针（向东）偏转的角度增大；（2）单台记录的P波初动符号在中强震前趋于一致，（3）主压应力P轴的仰角在中强震前有所增大。
Using the initial moving sign of a single small earthquake to solve the complex earthquakes of small earthquakes in Ningxia and its adjacent areas for six months, it is found that the principal compressive stress direction shows anomalous morphology before the moderate-strong earthquakes: (1) The principal compressive stress direction is away from the average The clockwise (eastward) deflection angle increases; (2) The single recorded P-wave precursory sign tends to be consistent before moderate-strong earthquakes, and (3) the elevation angle of principal compressive stress P- Increase.