Yanyan Yang¹, Bin Zhou², Gauthier Hulot³, Pierre Vigneron⁴, Nils Olsen⁵, Lars Tøffner-clausen⁶, Xuhui Shen¹ and Zeren Zhima⁷, (1)Institute of Crustal Dynamics, China Earthquake Administration, Beijing, China, (2)National Space Science Center, Chinese Academy of Sciences, Beijing, China, (3)IPGP, Paris, France, (4)Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, France, (5)Technical University of Denmark - Space, Kongens Lyngby, Denmark, (6)DTU Space, Copenhagen, Denmark, (7)The Institute of Crustal Dynamics, China Earthquake Administration, Beijing, China