Three-dimensional velocity structure imaging of the crust in the middle and northern section of the north-south tectonic belt of China

Hailiang Xin1,2, Mingjun Liu1, Lei Gao2, Min Kang1 and Xiaopeng Song1, (1)Geophysical Exploration Center, China Earthquake Administration, Zhengzhou, China, (2)University of Science and Technology of China, Hefei, China