1. 1Department of Geosciences and Geological and Petroleum Engineering, University of Missouri Science and Technology, Rolla, Missouri, U.S.A.
2. 2Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, Indiana, U.S.A.
3. 3University of Texas Institute for Geophysics, Austin, Texas, U.S.A.
4. 4GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
5. 5Institute of Geosciences, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
6. 6GNS Science, Lower Hutt, New Zealand