1970年后的大约十年间,各国地震学家先后提出了几种不同的前兆 假设:DD模式,IPE模式、“红肿”模式、组合模式、膨胀—蠕动模式等。当前,国际上主要沿着两个方向发展。一方面是对上述模式中的理论问题进行更深入的探讨。例如,地壳条件下微裂缝稳态扩展的机制和失稳准则;形变局部化的条件和行为; Seventy years after 1970, seismologists from all over the world put forward several different kinds of precursor hypotheses one after another: DD mode, IPE mode, “swollen” mode, combined mode, expansion-peristaltic mode and so on. At present, the development mainly takes place in two directions in the world. On the one hand, it is a more in-depth discussion of the theoretical issues in the above model. For example, the mechanism and instability criteria for the steady-state propagation of microcracks under crustal conditions; the conditions and behavior of localized deformations;