震源硬化模型的理论、实验及观测事实依据

从前兆异常共性特征、有关分析及岩石实验等方面，论证了震源硬化模型的科学性和合理性。指出强震震源将经历弹性形变、介质硬化、破裂成核和破裂失稳４个阶段。震源应力－应变扰动范围仅为震就度的１／２，不可能波及到几百公里之外，而７级强震前兆异常范围至少５００ｋｍ，因此前兆异常与地震都是区域应力场作用的结果和表现，前兆异常是测点附近浅层岩体产生裂隙、形变、位移的结果。地震是震源区岩石快速破裂的结果，它们同场共

Evidence of theory, test and observation for source hardening model

From the results of precursory generality, relevant theoretical analysis and rock test, the science and reasonableness of the source-hardening model are discussed in this paper. It is pointed out that the source of strong earthquake experiences four stages of elastic deformation, media hardening, fracturing nucleation and in stabilizing.The distur- bance range of source stress and strain is only half of the source size, which can not affect several hundred km away, but at least 500 km for precursory anomaly before a M7 earth- quake. Therefore, the precursory anomalies and earthquakes are all the results and expressions of action of regional stress fields. The precursory anomalies are the results of fissure, deformation and displacement generating from shallow rock body around the observational points. The earthquakes are the results of quick fracture of rocks around the source areas. Their occurrences in the same field are not the reciprocal causation. The hardening of media around source is the main cause generating quiescence of moderate and small shocks within the source areas in the medium and short stages t non precursory anomaly, seismic gaps, as well as precursory anomaly migrating from periphery to the center.