1. Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences University of Science and Technology of China Hefei China
2. Department of Physics University of Colorado Boulder Boulder CO USA
3. CAS Center for Excellence in Comparative Planetology Hefei China
4. Department of Geosciences State University of New York at Stony Brook Stony Brook NY USA
5. Now at Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of Technology Cambridge MA USA