我国大陆孕震环境的不均匀性与地震前兆的复杂性

THE HETEROGENEITY OF THE EARTHQUAKE -GENERATING ENVIRONMENTS OF CONTINENTAL EARTHQUAKE IN CHINA AND THE COMPLEXITY OF THEIR SEISMIC PRECURSORS

文章研究了地体环境与地震活动的不均匀性、构造物理条件与地震活动的不均匀性、地球动力学条件与地震活动动态发展的不均匀性、震源类型的差异、地震前兆的地区性以及中国大陆地震前兆的基本特征等与地震前兆复杂性的关系,认为地震前兆复杂性有其深刻的物理成因基础,其产生的基本原因源自从地质构造环境到震源介质,不同尺度、不同层次和孕震过程不同阶段物理条件的不均匀性。 构造地震的孕育是一个过程,是在大区域孕震系统中长时间内发生的过程,从实际观测到的复杂的广义地震前兆中区分构造前兆和震源前兆,进而探索地震孕育的可能的物理过程和解决地震预报问题是有效的途径。

The paper discusses the relationship between the heterogeneity of seismic activity and terrace condition, between the heterogeneity of seismicity and tectonophysical conditions, as well as that between the heterogeneity of the dynamic development of seismicity and geodynamic conditions. Besides, the relation of the complexity of seismic precursors to difference of types of seismic sources, regionality and principal features of seismic precursors of continental earthquakes in China have also been discussed. It is suggested that the complexity of seismic precursors has its profound physical basis of generation. It can be attributed basically to the heterogeneity of the physical conditions of geologic-structural environment and seismic source medium that occurred in different scales, different level and different stages of seismic generation. The generation of tectonic earthquakes is a process that occurs in a long period in a large regional earthquake-generating system. The distinction between the tectonic precursors and seismic source precursors from the practically observed complex and generalized seismic precursors is a effective approach to the study of the physical process of earthquake generation as well as to earthquake prediction.