Richard C Aster, Colorado State University, Geosciences Department, Fort Collins, CO, United States, Michael G Baker, Colorado State University, Fort Collins, CO, United States, Peter D Bromirski, Univ California San Diego, La Jolla, CA, United States, Douglas Wiens, Washington University in St Louis, St. Louis, MO, United States, Andrew Nyblade, Pennsylvania State University, Department of Geosciences, University Park, PA, United States, Peter Gerstoft, Univ of California San Diego, San Diego, CA, United States, Ralph A Stephen, WHOI, Woods Hole, MA, United States and Zhao Chen, University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States