ON THE CHARACTERISTICS OF THE PHASE OF SOLID TIDAL STRESS FOR DIFFERENT TYPES OF EAR- THQUAKE SEQUENCES OCCURRED IN THE CONTINENT OF CHINA

In this paper, the characteristics of phase distribution of solid tidal stress for 131 strong earthquake sequences occurred in the continent of China have been studied.The results obtained about the maximum tidal shear stress are as follows: there is an apparent optimal distribution of phase of the main shock for the earthquake sequence of the single-shock type and main-shock type, but the optimal phase of the main shock of the single-shock type is significantly higher than that of the main-shock type; in the earthquake sequence of the swarm-shock type, it is easily observed that some apparent clusters can be distinguished, and the phases of the sequence which consists of the main earthquake in each cluster tend to decrease orderly; the phase of late strong aftershocks of various types of earthquake sequences are also of optimal distribution.The composite characteristics of the phases of the maximum tidal shear stress and tidal hydrostatic stress of different earthquake sequences have definite physical significance, which is also an intended effect of the stress path of A type and B type loading processes in rock acoustic emission experiments in our problem.