1. Department of Earth and Planetary Science, Graduate School of Science; The University of Tokyo; Tokyo Japan
2. Geological Survey of Japan; National Institute of Advanced Industrial Science and Technology; Ibaraki Japan
3. Now at Earth Observatory of Singapore; Nanyang Technological University; Singapore
4. Department of Geological Sciences; University of Florida; Gainesville Florida USA
5. Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology; Nankoku-shi Kochi Japan
6. Department of Applied Science, Faculty of Science; Kochi University; Kochi-shi Kochi Japan
7. Naval Research Laboratory; Stennis Space Center, Hancock County; Mississippi USA
8. Now at The University of Texas, Institute for Geophysics; Austin Texas USA
9. Research and Development Center for Ocean Drilling Science, Japan Agency for Marine-Earth Science and Technology; Yokohama-shi Kanagawa Japan
10. Now at Tokyo University of Marine Science and Technology; Minato-ku Tokyo Japan