利用接收函数研究鄂尔多斯东缘地壳上地幔结构  

Detecting Crustal and Upper Mantle Structures of the Eastern Margin of the Ordos Using Receiver Functions

作　　者：黄韬[1] 米宁[1] 王良书[1] 徐鸣洁[1] 李华[1] 于大勇[1] 

机构地区：[1]南京大学地球科学与工程学院,南京210093

出　　处：《高校地质学报》2011年第4期569-576,共8页Geological Journal of China Universities

基　　金：国家自然科学重点项目基金(40634021)

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—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,从鄂尔多斯至渤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,抬升8～10km,且其Moho面的上隆和新生代地堑的凹陷呈镜像关系。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 about 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 8-10 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.

关 键 词：接收函数 阵列反卷积 地壳上地幔结构 

分 类 号：P553[天文地球—构造地质学]