1. Danish Lithosphere Center; Copenhagen Denmark
2. Geological Survey of Denmark and Greenland; Copenhagen Denmark
3. Department of Geology and Geophysics; University of Wyoming; Laramie Wyoming USA
4. School of Earth and Atmospheric Sciences; Georgia Institute of Technology; Atlanta Georgia USA
5. Department of Earth and Planetary Science; University of California, Berkeley; Berkeley California USA
6. Scripps Institution of Oceanography; University of California, San Diego; La Jolla California USA
7. Department of Geology and Geophysics; Woods Hole Oceanographic Institution; Woods Hole Massachusetts USA