Depth and sharpness variations of 410-km and 660-km discontinuities in North China Craton from dense array ambient noise interferometry

Huajian Yao1, Jikun Feng1, Piero Poli2, Lihua Fang3 and Yan Wu4, (1)University of Science and Technology of China, School of Earth and Space Sciences, Hefei, China, (2)Massachusetts Institute of Technology, Cambridge, MA, United States, (3)Institute of Geophysics, China Earthquake Administration, Beijing, China, (4)Institute of Geophysics, CEA, Beijing, China