1. Department of Geology, University of Maryland, College Park, MD 20742, USA
2. Berkeley Seismological Laboratory, McCone Hall, University of California, Berkeley, CA 94720, USA
3. Institut de Physique du Globe de Paris, 1 Rue Jussieu, F-752382 Paris Cedex 05, France
4. College de France, 11 Place Marcelin Berthelot, F-75005 Paris, France
5. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
6. Geological Survey of Canada, Pacific Division, Sidney, BC V8L 4B2, Canada
7. Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge CB30EZ, United Kingdom
8. Laboratoire de Planetologie et de Geodynamique, Nantes University, UMR-CNRS 6112, BP92208 F-44322 Nantes, France
9. Laboratoire de Geologie de Lyon-Terre, Planete, Environnement, CNRS UMR 5276, Ecole Normale Superieure de Lyon, Universite de Lyon, Universite Claude Bernard Lyon 1, Villeurbanne, France
10. Department of Earth Sciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The Netherlands
11. Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA
12. Geophysics Section, School of Cosmic Physics, Dublin Institute for Advanced Studies, Dublin, Ireland
13. Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA
14. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
15. Department of Earth Sciences, University of Oxford, Oxford OX13PR, UK
16. Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA