Abstract: In this paper.1-D and 2-D ray tracing and travel time fits as well as calcdation of the synthetic seismograms are performed from the DSS data obtained on Heze～Changzhi and Zhengzhou～Jinan profiles respectively. The velocity structure of the crust and upper mantle wasdetermined. The result shows that the velocity structure of the crust and upper mantle is imhomogeneous apparently in vertical and lateral directions. The rift is well-developed in the shallowercrust,and corresponds to the obvious relief of deep crust interface and the velocity contours. Insouthern part of North China depression,there are two local convexes on the background of theupwiiling upper mantle. Their highest positions correspond basically to the Dongpu depressionand Tangyin graben in the shallow crust.The depth of Moho discontinuity is about 31 and 34km, respectively.

Key words: Seismic sounding, 2－D ray tracing, Velocity structure, Crust and upper mantle, Henan

摘要： 利用菏泽～长治和郑州～济南深地震测深剖面资料,进行了一维、二维射线追踪走时拟合与合成地震图计算,获得了该区地壳上地幔速度结构。结果表明,地壳上地幔速度结构在纵向和横向上具有明显的不均一性。浅部断裂较发育,对应其地壳深部界面和速度等值线起伏变化较明显。在华北坳陷区南部上地幔隆起的背景上存在两个局部凸起,凸起最高处与浅部的东濮凹陷、汤阴地堑基本对应,M面埋深分别约31km和34km.

关键词: 地震测深, 二维射线追踪, 速度结构, 地壳上地幔, 河南