1. Department of Earth Science; University of California; Santa Barbara California USA
2. Laboratoire Magmas Et Volcans, Universite Blaise Pascal; CNRS UMR 6524 Clermont-Ferrand France
3. Department of Geology and Geophysics, School of Earth and Ocean Sciences and Technology; University of Hawaii, Manoa; Honolulu Hawaii USA
4. College of Earth, Ocean and Atmospheric Sciences; Oregon State University; Corvallis Oregon USA
5. Department of Terrestrial Magnetism; Carnegie Institution of Washington; Washington District of Columbia USA
6. Graduate School of Oceanography, University of Rhode Island; Narragansett Rhode Island USA
7. Research School of Earth Sciences; Australian National University; Canberra ACT Australia