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自从沙道夫斯基等人观测到中亚某些强震前压应力轴取向发生90°转动以来,许忠淮等研究了唐山地震前后京、津、唐、张地区应力场的方向特征,没有发现唐山大震前后应力轴取向的显著改变。华祥文研究了类似的问题,结果表明,1958—1971年期间京、津周围地区并没有形成统一的孕震应力场,自1972年开始才形成了一个与华北地区区域应力场方向大体一致的孕震应力场,但震前并未观测到平均应力轴取向发生转动。根据阚荣举等人的结论,龙陵地震前平均压应力轴的取向发生45°的转动,但是根据他的结
Since the observation by Sandodwinski et al. Of 90 ° rotation of the compressive stress axis orientation before some strong earthquakes in Central Asia, Xuzhong Huai et al. Studied the directional characteristics of stress fields in Beijing, Tianjin, Tang and Zhang before and after the Tangshan earthquake. Tangshan Significant changes of stress axis orientation before and after large earthquakes. Huaxiangwen studied similar problems. The results showed that there was no uniform stress field of geocentrism formed around Beijing and Tianjin in 1958-1971. Since 1972, there has been only one pregnancy that is generally consistent with the regional stress field in North China Shock stress field, but not observed before the earthquake axis direction of the average stress rotation. According to Kan Rongju et al’s conclusion, the average compressive stress axis of the Longling earthquake occurred before the rotation of 45 °, but according to his knot