1. Department of Earth and Environment; Boston University; Boston Massachusetts USA
2. Department of Earth Science; University of California Santa Barbara; Santa Barbara California USA
3. Université Blaise Pascal - CNRS - IRD; Laboratoire Magmas et Volcans; OPGC Clermont-Ferrand France
4. Department of Terrestrial Magnetism; Carnegie Institution of Washington; Washington DC USA
5. Department of Geosciences; Swedish Museum of Natural History; Stockholm Sweden
6. Geosciences Research Division; Scripps Institution of Oceanography; La Jolla California USA
7. Department of Geology and Geophysics; Woods Hole Oceanographic Institution; Woods Hole Massachusetts USA
8. Graduate School of Oceanography, University of Rhode Island; Narragansett Rhode Island USA