Study of Earth Dynamics by Ocean Drilling & Survey

这个项目（海洋钻探计划）是一个国际计划，致力于研究地球内部和环境的动态利用海洋钻探船，JOIDES决议。海底钻探、岩心回收、井下测井和监测为地壳和地幔的性质提供了有用的信息。日本参与了该项目，包括联合船上协作工作和R/V Hakuho-Maru的现场调查。今年（1月16日至3月16日），KH98-1号巡航船在Ontong爪哇高原和北所罗门海沟进行了1500公里长的地震反射剖面，使用29台obs和50个声纳浮标进行了地震折射调查（美国-挪威-日本联合调查），IZANAGI侧扫描声纳调查和重力-磁力-测深调查。研究结果对高原地壳性质、高原-洋底过渡、高原碰撞过程和吸积棱镜的形成等方面有了新的认识。在ODP规划方面，日本参与了执行委员会、科学委员会和其他小组会议，对项目绩效做出了重大贡献。

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.