汤阴地堑及邻区的壳幔结构与地震危险性  

TANGYIN GRABEN AND CRUST-MANTAL STRUCTURE IN NEAR AREA AND EARTHQUAKE RISK

作　　者：任青芳[1] 张先康[1] 张成科[1] 赵金仁[1] 周雪松[1] 

机构地区：[1]中国地震局地球物理勘探中心

出　　处：《东北地震研究》1998年第3期10-16,共7页Seismological Research of Northeast China

基　　金：国家地震局合同制项目

摘　　要：本文利用荷泽－林县－长治剖面西段和郑州－济南剖面南段深地震测深资料，通过一、二维计算与解释，获得了汤阴地堑及邻区的二维速度结构．结果显示：该区地壳上地幔结构在纵、横向上均具明显的差异，地壳厚度变化大局部存在低速块体，对应汤阴地堑为Ｍ面隆起，隆起高点Ｍ面埋深为３１ｋｍ，向东往浚县隆起区Ｍ面逐渐加深３２ｋｍ，向西往太行山前隆起Ｍ面为一陡变带，至长治附近Ｍ面埋深增至４０ｋｍ．根据华北地区历史地震与深部结构与构造的相关分析认为。Making use of DSS data of two profile,two-dimensional velocity structure for Tangyin graben and its near area has been obtained by means of calculation and interpretation.The results show that crust-upper mantal structure is possessed of obvious difference in longitudinal and transverse direction.The difference appears as follows:crust thick with relatively large variation,the block with low velocity.Tangyin graben shows Mobo upwarp and Moho depth is 31km.According to correlation between historic earthquakes and deep structure,perhaps there exists earthquake risk in Tangyin graben and near area.

关 键 词：地堑 壳幔结构 地震危险性 

分 类 号：P315.2[天文地球—地震学]