1. Department of Marine Geology and Geophysics Lamont‐Doherty Earth Observatory Columbia University Palisades NY USA
2. Université de Paris Institut de Physique du Globe de Paris CNRS Paris France
3. Jackson School Institute for Geophysics University of Texas at Austin Austin TX USA
4. Department of Earth and Environmental Sciences Dalhousie University Halifax NS Canada
5. Department of Geology and Geophysics Woods Hole Oceanographic Institution Woods Hole MA USA
6. Department of Earth Sciences University of Oregon Eugene OR USA