1. Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, Maryland
2. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania
3. Department of Physics and Astronomy, and Department of Earth and Environmental Sciences, University of Pennsylvania, Philadelphia, Pennsylvania, and MIT–WHOI Joint Program in Applied Ocean Physics and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts
4. Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, Maryland, and Innovative Decisions, Inc., Vienna, Virginia