1. Department of Earth, Atmospheric, and Planetary Sciences; Massachusetts Institute of Technology; Cambridge MA USA
2. School of Earth and Space Sciences; University of Science and Technology of China; Hefei China
3. Department of Geology; Wayne State University; Detroit MI USA
4. Institute of Geophysics and Planetary Physics; University of California, San Diego; La Jolla CA USA
5. Department of Earth and Environmental Sciences; University of Ottawa; Ottawa Ontario Canada
6. Geophysics Section, School of Cosmic Physics; Dublin Institute for Advanced Sciences; Dublin Ireland