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引言 苏联学者首先报道了在某些强震前,由小震断层面解确定的压应力轴方向发生变化的实例。他们的实例表明,强震前压应力轴的方向变化可分为两个阶段:在大于震源区范围内,震前较长时间(第一阶段)压应力轴分布方向逐渐朝大区域应力场方向收缩;临震前(第二阶段)出现第二次取向,而重新取向后的方向与主震压应力轴方向一致,震后压应力轴方向又变为分散。
Introduction Soviet scholars first reported examples of changes in the direction of the compressive stress axis determined by the solution of a small fault before some strong earthquakes. Their examples show that the direction of the compressive stress axis before strong earthquakes can be divided into two phases: in the region larger than the source region, the distribution direction of the compressive stress axis gradually increases toward the direction of the stress field in large regions Contraction; before the earthquake (second phase) appears the second orientation, and the direction of the reorientation with the main shock compressive stress axis direction, after the earthquake compressive stress axis direction has become dispersed.