TOKUYAMA Hidekazu Ocean Research Institute. Uni of Tokyo. Assciate Professor, 海洋研究所, 助教授 (10107451)
TAMAKI Kensaku Ocean Research Institute. Uni of Tokyo. Professor, 海洋研究所, 教授 (50188421)
SUHIRO Kiyoshi Ocean Research Institute. Uni of Tokyo. Professor, 海洋研究所, 教授 (20133928)
SOH Weon Kyushu Univ. Associate Professor, 理学部, 助教授 (90183847)
TADA Ryuji Uni of Tokyo. Associate Professor, 大学院・理学系研究科, 助教授 (30143366)
This project (Ocean Drilling Program) is an international program dedicated to study the dynamics of the earth interior and environment utilizing an ocean drilling vessel, JOIDES Resolution. Drilling of seafloor with core recovery, downhole logging and monitoring provide useful information of the nature of crust and mantle. Japanese participation on this project includes joint onboard collaboration work and site survey by R/V Hakuho-Maru. This year (Jan. 16 to March 16), KH98-1 cruise conducted 1500km long seismic reflection profiling, seismic refraction survey using 29 OBSs and 50 sonobuoy (US-Norway-Japan joint survey), IZANAGI sidescan sonar survey and gravity-magnetics-bathymetric survey of on the Ontong Java Plateau and Northern Solomon Trench. The results show new findings related to the nature of plateau crust, plateau-ocean floor transition and collisional process of plateau and formation of accretionary prism. Regrading ODP planning, Japanese participation on the executive committee, science committee and other panel meetings contributed significantly to the project performance.