一、引言由于全球的及区域的构造运动,或其它因素,地壳中一些部位可能受到较强的地应力作用,逐渐积累应变能,最终导致地壳岩层的变形、失稳、破坏而发生地震.搞好地震预报,一方面需研究不同地区地壳的应力、应变状态与介质性质;另一方面还需依据岩石破 I. INTRODUCTION Due to the global and regional tectonic movements and other factors, some parts of the crust may be subject to strong in-situ stress and gradually accumulate strain energy, which eventually leads to the occurrence of earthquakes in the deformation, instability and destruction of crustal strata. Good earthquake prediction, on the one hand need to study different regions of the crustal stress, strain state and the nature of the media; on the other hand also need to rock broken