Abstract: The deep seismic sounding data set obtained from the west section of northwest trending wide angle reflection and refraction Xianghe-Beijing-Zhulu profile have been studied by means of two dimensional processing,calculation as well as synrhetical interpretations,and rhe basic features of crust mantle velocity structure and deep tectonics about this range are determined.The resulrs show that the crust mantle velocity structures present both lateral and radial hetergeneity in different range. The deep crust mantle tectonics appears evidently layered structures and the Moho discontinuity slops down from east to west.The crust thickness,which is 32～33km in Xianghe east,sharply reaches 39～40km in Xishan mountain area of west Beijing and south Huailai as well as Zhulu. In Beijing,its thickness is about 36.5km and in west Xianghe exists deep fault stretching to the Moho interface.

Key words: Seismic sounding, Crust mantle structure, Velocity structure, Beijing

摘要： 通过对北西向的宁河-北京-涿鹿宽角反射/折射剖面西段测深资料的二维处理、计算以及综合解释研究,获得了该段壳幔速度结构和深部构造的基本特征。结果表明:不同区域的壳幔速度结构在纵向和横向上均具有明显的非均匀性,壳幔深部构造呈现明显的层状结构和东浅西深的倾斜状态,地壳厚度由香河以东的32～33km向西至北京西部的西山山区、怀来南部以及涿鹿迅速加深至39～40km,其中北京为36.5km左右,并且在香河的西侧存在着延伸至M界面的深断裂。

关键词: 地震测深, 壳幔构造, 速度结构, 北京