Abstract
AbstractWe parameterized the velocity model of North China using square nets. Grid spacing is 1.0km and there are 649×890×16 grid points in the whole velocity model. We obtained three‐dimensional (3‐D) upper crustal velocity structure of North China using 3‐D finite‐difference inversion method and Pg wave data from 30 deep seismic sounding (DSS) profiles in the studied area. The inversion results revealed that the low velocity rhombshaped North China basin is surrounded by high velocity uplifts, and North China basin is comprised of two large fault zones with an uplift in between. The two large fault zones are divided into several small basins. There are many shovel‐like normal faults in the studied area and the depth of crystalline basement varies significantly at different geological structures. All these results suggest that North China has very complicated geological structure and it has the deep structural background for strong earthquakes.
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