Adrien F Arnulf, Institute for Geophysics, Austin, TX, United States, Dan Bassett, GNS Science, Lower Hutt, New Zealand, Alistair J Harding, Scripps Institution of Oceanog, La Jolla, CA, United States, Shuichi Kodaira, Yokohama National University, Yokohama, Japan and Ayako Nakanishi, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan