云南活动性断裂带的结构变异与孕震体构造的空间关系

中国的强震主要发生在一些板内大型走滑断裂带上，地震的破裂基本上是以走滑型破裂为特征。在这些活动性的走滑断裂带上形成的孕震体构造与该走滑断裂结构在空间的变化有关，并且表现出几种主要的变异形式。结合西南地区地震构造的实例，本文剖析了这几种结构变异形式，阐明了孕震体构造存在的空间机制。本文从地震与构造丛集相关及其所具有的分维特征入手，展开了对孕震区断裂结构变异特征的识别和孕震体空间机制的探讨，表述了一条活动性大断裂必须由若干次级断裂和无数中小断裂的空间组合，才能形成孕震体的必要条件。

SPACE RELATION BETWEEN TECTONIC VARIANT OF ACTIVE FAULT ZONE AND TECTONICS OF SEISMOGENIC BODY IN YUNNAN

The strong earthquakes in China mostly occurred in large intraplate strike-slip faults and seismic rupture is charaterized maily by strike-slip rupture. It has been researched that the seismogenic structures formed in the active strike-slip fault zones are related with variation in space of the strike-slip structures and appear mainly in some main variants. Combined with the seismotectonic examples in Southwest China, this paper analyses these kinds of tectonic variants and interprets space mechanism of seismogenic body. Starting with the relationship between earthquakes and the crowded structures and their fractal features, this paper has studied how to distinguish the the variant characteristics of fracture structures in seismogenic region, discussed the space mechanism of seismogenic body and considers that if a large active fault is consisted of several secondary faults and numerously middle-small faults, the necessary conditions for seismogenic body will be formed. The results obtained in this paper may be significative of understanding the theory of elastic rebound and stick-slip on seismic rupture, the theory of seismic nucleation and the dynamic model of lithosphere and studing reduction of seismic risk region and seismic precursor law.