Two-dimensional model of Heze-Linxian-Changzhi section

The DSS section of Heze-Linxian-Changzhi starts from the southwest of Luxi Uplift in the east, passes through Dongming Depression, Neihuang Uplift and Tangyin Graben, and ends in Changzhi in the south of Taihang, with a total length of about 350km.

The results show that (Figure 3. 12): The crust structure of Taihang Uplift on the west side of the profile is similar to that of Zhengzhou-Jingbian, which is horizontally uniform and layered, with the upper and lower crust slightly reversed in speed. Tangyin Graben has a surface depression with a thickness of about 35-40km and a sedimentary thickness of about 4km. Moho surface is slightly uplifted, and the middle crust has a high-speed layered structure extending transversely, which may be invaded by the upper mantle material in the middle crust when the graben is formed. The basement of Neihuang Uplift is deep in the east and shallow in the west, about 3 ~ 3~ 1.5km, the crust is about 33 ~ 34 km thick, and the average velocity is about 6.2 km/s. The crust shows the structural characteristics of relatively stable stratification and increasing velocity with depth. The surface sediments in Dongming Depression are very thick, about 10km, and the occurrence is steep in the east and gentle in the west. The fault difference between the eastern and western edges of Luxi Uplift is about 5 ~ 6 km, the buried depth of Moho uplift is about 30km, and the average velocity is about 5.8 km/s. The crust is in a low-speed layered structure from top to bottom. The basement of Luxi uplift is about 2 ~ 3 km deep and uniform in the lateral direction. The crust is about 33km thick and the average velocity is about 6.2 km/s. The crust is layered from top to bottom, and the velocity increases with the depth. The obvious difference of crustal media between Luxi Uplift and Dongming Depression and the large fault distance on the upper crust surface indicate the existence of faults on the crust (Jia et al., 199 1).

Fig. 3. 12 crustal P-wave velocity structure in Heze-Linxian-Changzhi deep earthquake section