地震迁移和破裂发展

前言全球每年平均发生地震约500万次。这些地震绝大多数分布在巨大构造板块接合处:它们是环太平洋带、地中海-喜马拉雅带、大西洋、北冰洋、印度洋及太平洋东侧的中脊地带以及大陆裂谷系。

MIGRATION OF EARTHQUAKES AND THE DEVELOPMENT OF FRACTURES

Earthquakes are not only associated with faults in their spatial distribution but also migrate from place to place according to certain rules in the course of time. It has been established that the spatial distribution reflects the degree of concentration of tectonic stresses and release of strain energy, while the migration of earthquakes indicates the variation of the tectonic stressfield. In general, the spatial distribution of the earthquakes describes the pattern of relative motion between the f aulted-blocks under static condition, while the migration of the earthquakes under dynamic state.In view of the concentration of tectonic stressfield and its variation, the regularity of earthquake migration and its dynamic state were discussed in connection with the characteristical features of seismic activities in China. By some simple model experiments earthquake migration may be compared with the development of the relevant fractures.