2011年12月，第17卷，第4期，569-576页 Decemher 2011,Vol.17，No.4,p.569-576
高校地质学报
Geological Journal of China Universities
利用接收函数研究鄂尔多斯东缘地壳上地慢结构
黄韬，米宁，王良书“，徐鸣洁，李华，于大勇
南京大学地球科学与工程学院，南京210093
摘要：由1876个远震三分量P波地震图组成的数据集，取自布置于鄂尔多斯一太行山一线的宽频带流动台站。通过阵列反卷积方法，得到地下界面响应的接收函数，并通过共转换点偏移叠加得到地下结构的图像。图像显示，从帮尔多斯至游海湾盆地地壳厚度总体上逐渐变薄，Moho面总体呈小角度向西倾斜。鄂尔多斯块体中部地壳最厚，达到52km，向东到鄂尔多斯边缘，地壳厚度减小至43km。太行山至渤海湾盆地地壳厚度从45km减小至37km。山西地堑下方Moho面上隆，和两边的
Moho面相比，升8~10km，且其Moho面的上隆和新生代地堑的凹陷量镜像关系。关键词：接收函数，阵列反卷积，地壳上地慢结构
中图分类号：P553
文献标识码：A
文章编号：1006-7493（2011）04-0569-08
Detecting Crustaland UpperMantle Structures of theEasternMargin of the
OrdosUsingReceiverFunctions
HUANG Tao, MI Ning, WANG Liang-shu', XU Ming-jie, LI Hua, YU Da-yong
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China
Abstract: A data set of 1876 three-component, P wave seismograms from 22 stations deployed at Ordos and Taihang mountains was collected to investigate crust and upper mantle structure of that area. By using the array deconvolution method, the vertical, radial, and tangential receiver functions of all events are obtained. All radial receiver functions are then migrated to produce a seismic image. The image shows that from Ordos to Bohai Bay basin, the crust becomes thinner from ahout 52 km to 37 km, and the Moho generally dips to the west at a small angle. In central part of Ordos basin, the crust is thickest, reaching 52 km; at the eastern edge of Ordos, the thickness decreases to 43 km. From Taihang Mountain to Bohai Bay basin, the thickness of the crust changes from 45 km to 37 km. Under the Shanxi Graben, the Moho suddenly uplifts by approximately 810 km in comparison to that of both sides, and the rise of the Moho and the depression of the surface show a mirror-image relationship.
Key words: receiver function; array deconvolution; crustal and upper mantle structure Corresponding author: Wang Liangshu, Professor; E-mail: Iswang@nju.edu.cn
1
引言
华北克拉通形成于新太古代一古元古代，是
中国最古老的大陆克拉通，也是世界上最古老的收稿日期：2011-0506；修回日期：2011-0527
基金项目：国国家自然科学重点项月基金（40634021）
克拉通之一（Songetal.，1996）。华北克拉通板块自晚中生代以来经多期构造运动改造，地壳结构的整体性已经被破坏，形成了与构造应力相关的、地壳结构明显不同的分块构造特征，主要分
作者简介：黄蜡，男，1985年生，地球物理专业硕土研究生；E-mail:nju_huangtao@126.com
"通讯作者：王良书，男，教授，博导，主要从事深部地球物理探测研究：E-mail:Iswang@nju.edu.en