地震是地下岩体大规模失稳破裂的扩展过程,尽管在地震孕育的全 过程中,可能有多种物理化学过程的参与,但临震前一刻,最终必须转化为应力的变化表现出来,因此,把握地壳内控制破裂失稳扩展的力学条件,对地震预报具 Earthquakes are an expanding process of large-scale instability and rupture of underground rock mass. Although there may be a variety of physical and chemical processes involved in the whole process of earthquake geology, the changes that eventually have to be transformed into stress before earthquakes are manifested , Grasp the crustal instability within the control of the expansion of the mechanical conditions of earthquake prediction