Crustal Structure of the Rift‐Depression Basin and Yanshan Uplift in the Northeast Part of North China

Abstract

AbstractA comparatively complete layout chart is built by using small shot interval and receiver spacing in Tianjin–Beijing–Chicheng Deep Seismic Sounding profile. Based on the DSS data of the profile, the crustal structure and the tectonic coupling are studied in the rift‐depression basin of eastern North China and Yanshan mountain uplift. Based on the existing researches in the region, the seismic structure environment is further analyzed in the eastern segment of Zhangjiakou–Bohai seismic belt. The result shows that the tectonic feature and interface structure of the crystalline basement in the rift‐depression basin of eastern North China Craton are correlated with the geotectonic movement since Cenozoic era. The entirely different crustal structures between the stable Yanshan uplift with high velocity in the north and the incompact rift basin with low velocity in the south make the intergradational zone between the tectonic zoning line, Baodi–Tongbai and Ninghe–Changli faults, and Yanshan uplift provide a favorable structural environment for generation and occurrence of earthquakes in the eastern plain region of Zhangjiakou–Bohai seismic belt.