从地壳运动角度分析大陆强震机理的一种物理方法  

A Physical Method of Analyzing the Continental Strong Earthquake Mechanism from Crustal Movement

作　　者：申重阳[1] 吴云[1] 甘家思[1] 

机构地区：[1]中国地震局地震研究所,中国武汉430071

出　　处：《中国地震》2001年第1期70-81,共12页Earthquake Research in China

基　　金：国家 973计划项目!资助 (G1 9980 4 0 70 3 )

摘　　要：为了从地壳运动角度利用重复大地测量数据分析大陆强震机理 ,提出了利用反映地壳内部密度变化或时变的物理量来分析强震发生的密度变化机理的一种物理方法 :(1)介绍了地球内部密度时变的一般理论和单层密度时变理论 ,提出了分步迭代算法 ;(2 )简要分析了断层位错引起的单层密度变化效应 ;(3)分析了 1996年丽江 7级地震前震区南部地壳密度时变 (变化 )的特征 ;(4 )初步探讨了强震孕育过程中可能的地壳内部密度时变 (变化 )前兆模式或发震机制。In order to analyze the continental strong earthquake mechanism on crustal movement from the repeated geodetic data,this paper has provided a physical method which analyzed the strong earthquake mechanism of the density changes by use of the physical magnitute reflecting the time changes of crustal density (TCCD or TCD):①The theory on the time changes of earth's interior density and single layer density has been introduced,and its algorithm of steping iteration is provided;②The effect of the single layer density's changes raised by fault dislocation is simply studied;③Before Lijiang earthquake ( M L=7 0,1996). The character of TCCD at the south area of the seismic region has been studied;④The strong earthquake precursor or causal mechanism of TCCD is discussed preliminarily.

关 键 词：地壳运动 强震机理 密度变化 物理方法 发展机制 

分 类 号：P315.2[天文地球—地震学]