Wenbo Wu¹, Zhongwen Zhan¹, Jörn Callies² and Sidao Ni³, (1)California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States, (2)California Institute of Technology, Pasadena, CA, United States, (3)Institute of Geodesy and Geophysics, Chinese Academy of Sciences, State Key Laboratory of Geodesy and Earth's Dynamics, Wuhan,Hubei, China