关键词: 接收函数, 鄂尔多斯地块, 山西断陷带, H-κ扫描叠加, 共转换点叠加, 地壳结构

Abstract: Based on the data of teleseismic waveforms recorded by 150 mobile seismic stations in the study area of the central and western part of the North China Craton (107 ° E~117 ° E; 34 ° N ~ 41 ° N) in the past three years, the detailed crustal thickness images in the study area are obtained by using the P-wave receiving function H-κ stacking method and the Common Conversion Point (CCP) stacking method. The results show that the crustal thickness in Ordos block is the medium The Moho surface is relatively flat between 38-45km. The thickness of the crust in Shanxi Rift is between 33 ~44km, the Moho obviously uplifted (4~10 km) directly under the depression in Linfen basin. It is inferred that the formation of Shanxi Rift is closely related to the material movement of the mantle. The Poisson's ratio of the upper mantle material upwelling under the Shanxi Rift is higher than that of the mountains on both sides, and it can be divided into two regions, the north part and the south part, with 38 ° N as the boundary. The average Poisson's ratio of the crust under the station in the region north of 38 °N is larger, the maximum value is more than 0.30, while the Poisson's ratio in the region south of 38 ° north latitude is lower, the maximum value is 0.29, which may represent the partial melting in the crust of this region, while the south part of 38 °N still maintains some structural characteristics of stable crust.

Key words: receiving function, Ordos block, Shanxi Rift, H-κ stacking, Common Conversion Point stacking, crustal structure