华北地区地壳密度变化特征的初步研究  

CHARACTERASTICS OF CRUSTAL DENSITYCHANGE IN NORTH CHINA

作　　者：申重阳[1] 吴云[1] 秦小军[1] 孙少安[1] 

机构地区：[1]中国地震局地震研究所,武汉430071

出　　处：《大地测量与地球动力学》2003年第1期29-34,共6页Journal of Geodesy and Geodynamics

基　　金：国家 973计划项目 (G19980 40 70 3)资助

摘　　要：利用重力与水准资料计算研究了华北地区的背景单层密度变化和 1985～ 1992年单层密度时变图像特征。结果显示 :①研究区背景地壳密度变化在承德至北京附近呈向西舌形结构 ,地壳物质总体具有向西不均匀运移趋势 ;②地壳密度时变主要显示三河至唐山存在相对高值异常 ,与背景地壳密度变化差异明显 ;③研究区地壳密度时变与活动断裂带明显相关 ,地震活动与地壳密度变化的高梯变和等值线拐弯有关。On the basis of the repeated gravity and leveling data in North China (the capital circle), the background density changes and the single layer density changes in the period from 1988 to 1992 are computed. The results show that ①the background density changes from Chengde to Beijing take on a configuration of tongue towards the west and the crust matter,as a whole, has westwords trend of inhomogeneous movement; ②The time variations of crustal density are different from the background changes, and it is found that the relatively high anomaly is between Sanhe and Tangshan; ③The time changes of crustal density are obviously related with the active fault zone, the seismic activity is related with the high gradient of the time variations of crustal density and the bending of its isoline.

关 键 词：华北地区 重力 水准 密度 地壳 地震活动 大地测量 GPS 

分 类 号：P315.72[天文地球—地震学] P542[天文地球—固体地球物理学]