亚欧地震系的地震构造特征

亚欧大陆区地震以浅震为主,散布成面,其地震频度、b值和复发视周期等均与环太平洋地震系显著不同,称其为亚欧大陆地震系.按地震的强弱和疏密的分区以及密集的排列,可分出地震的区、带.中蒙、伊阿巴、地中海三个地震区东西连接横贯大陆.它们又以经向中轴线分左右半区,在地震的多少、地震带的走向和地震机制等方面均表现左右反对称的关系.关于大陆地震的动力问题,本文强调惯性力等体力的主因地位.     

全球地震构造系统与地球的非对称性

本文主要讨论全球地震构造系统与现今地球非对称动力系统的关系。全球地震构造可划分为三个非对称系统:环太平洋地震构造系,洋脊地震构造系,北大陆地震构造系。地球非对称性还表现为南、北半球的非对称,大西洋半球与太平洋半球的非对称和经向构造东、西两侧的非对称。全球非对称动力系统可能由经向对流、纬向对流和由地球转速变化产生的惯性流组成,它们构成了地球非对称性的动力学背景,并控制了全球地震构造系统的格局。     

GLOBAL SEISMOTECTONIC SYSTEMS AND THE EARTH''''S ASYMMETRY

This paper mainly discusses the relation between global seismotectonic systems and asymmetric geodynamic systems. Global seismotectonic systems may be divided into three asymmetric I-Scale systems: the circum-Pacific seismotectonic system, the oceanic ridge seismotectonic system, and the continental seismotectonic system in the Northern Hemiaphere. Global asymmetry is also indicated by the asymmetry between the Southern and Northern Hemispheres, the asymmetry between the Atlantic and Pacific Hemispheres, and the asymmetry between the east and west of meridioual tectonics. Global asymmetric geodynamic systems may be composed of meridional convection, latitudinal convection, and inertia flow resulting from the variation of the Earth's rotational velocity. These geodynamic systems constitute the dynamic background of global asymmetry and control the frameworks of global seismotectonic systems.