汤阴地堑及邻区的壳幔结构与地震危险性
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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，汤阴地堑及邻区可能存在发震危险
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.
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.
引文
1赵景珍，刘永泉．等．豫北地区中强地震构造背景探讨．地震地质，1984，6（2）：17～142赵景珍，顾梦林，等，汤阴地堑及其邻区大地形变，重力变化与最新地壳运动．地震地质，1986，8（2）：61～673孙武城，祝治平，等．中国地壳上地幔勘探成果．北京：地震出版社，：20～1234张成科，赵金仁，等．豫北及其外围地区地壳上地幔结构研究．地震地质，1994，243～2535任青芳，张成科，等．荷泽地区地壳结构特征与地震．华北地震科学，1992，45～51
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