1. Institution of Geology and Geoinformation; GSJ-AIST; Tsukuba Ibaraki 305-8567 Japan
2. Submarine Resources Research Project; JAMSTEC; Yokosuka 237-0061 Japan
3. Research Institute of Innovative Technology for the Earth; Kyoto 619-0292 Japan
4. Department of Earth Environmental Sciences; Graduate School of Technology and Science; Kumamoto University; Kumamoto 860-8555 Japan
5. Department of Cultural Properties & Heritage; Kanazawa Gakuin University; Kanazawa 920-1392 Japan
6. Department of Earth and Planetary Sciences; Graduate School of Environmental Studies; Nagoya University; Nagoya 464-8601 Japan
7. Institute of Geology and Paleontology; Graduate School of Science; Tohoku University; Sendai 980-8578 Japan