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| RV Yokosuka | |
|---|---|
| Ship name | RV Yokosuka |
| Country | Japan |
| Owner | Japan Agency for Marine-Earth Science and Technology |
| Operator | Jamstec |
| Builder | Japan Marine United Corporation |
| Laid down | 2004 |
| Launched | 2005 |
| Commissioned | 2006 |
| Fate | active |
| Displacement | 3,950 tonnes |
| Length | 70 m |
| Beam | 12 m |
| Draft | 4.5 m |
| Propulsion | diesel-electric |
| Speed | 14 kn |
| Complement | 40 |
| Capacity | 20 scientists |
| Notes | oceanographic research vessel, deep-sea submersible support |
RV Yokosuka is a Japanese oceanographic research vessel operated by the Japan Agency for Marine-Earth Science and Technology (commonly known as Jamstec). Built by Japan Marine United Corporation and commissioned in the mid-2000s, the ship serves as a platform for deep-sea exploration, hosting submersibles, remotely operated vehicles, and multidisciplinary scientific teams from institutions such as the University of Tokyo, Tohoku University, Kobe University, and international partners including Woods Hole Oceanographic Institution and Scripps Institution of Oceanography. The vessel supports strategic programs related to plate tectonics, marine geology, hydrothermal vents, and marine ecology across the Pacific Ocean, Sea of Japan, and East China Sea.
Yokosuka was designed under specifications drawn by Jamstec and naval architects with input from the Ministry of Education, Culture, Sports, Science and Technology (Japan) and academic stakeholders including the Japan Society for the Promotion of Science. Construction at the Kure shipyard of Japan Marine United followed a program influenced by earlier designs such as the RV Mirai and concepts from Institute of Oceanographic Sciences. Hull form, diesel-electric propulsion, and dynamic positioning systems were selected to support operations similar to those conducted by RV Maurice Ewing and RV Atlantis. Classing and surveys were performed in accordance with standards from Nippon Kaiji Kyokai and international conventions overseen by the International Maritime Organization.
Yokosuka is equipped with dynamic positioning, an A-frame, gantry, and moon pool to deploy instruments like deep-towed chassis, piston corers, and multibeam echosounders comparable to systems aboard RV Pelagia and RV JOIDES Resolution. Onboard laboratories—wet labs, dry labs, and a clean room—support scientists from institutions such as Kyoto University, Hokkaido University, Nagoya University, and international collaborators including Lamont–Doherty Earth Observatory and Royal Netherlands Institute for Sea Research. The ship carries deep-submergence vehicles for manned and unmanned missions, interoperable with submersibles like Shinkai 6500 and ROVs akin to Jason and Alvin. Navigation and geophysical suites include multichannel seismic systems, sub-bottom profilers, and magnetometers used in studies alongside programs like Integrated Ocean Drilling Program initiatives.
Since commissioning, the vessel has operated extensively in Western Pacific regions, supporting surveys near the Nankai Trough, Izu–Bonin Trench, and Ryukyu Trench. Yokosuka has participated in international exercises with platforms such as RV Sonne and RV Thalassa, and contributed to cooperative cruises involving agencies like the National Oceanic and Atmospheric Administration and French National Centre for Scientific Research. Missions have ranged from long-term monitoring projects tied to Trench Megathrust Research to rapid response investigations after events such as the 2011 Tōhoku earthquake and tsunami. Port calls and logistics have involved facilities in Yokosuka, Kagoshima, Hakodate, and overseas ports including Honolulu, Vancouver, and Singapore.
Yokosuka has enabled discoveries and datasets in marine geology, geophysics, geochemistry, and biological oceanography. Expeditions mapped hydrothermal vent fields on the Izu–Ogasawara Arc, collected sediment cores relevant to paleoceanographic reconstructions compared with results from Integrated Ocean Drilling Program sites, and characterized fluid chemistry at active vent sites akin to studies at East Pacific Rise and Mid-Atlantic Ridge. Biological surveys documented chemosynthetic communities similar to those described in work by Sylvia Earle and Bruce Shillito. Geophysical campaigns contributed seismic reflection profiles used in plate-boundary rupture models related to research by Kelin Wang and Nan Lin. Collaborative publications with researchers from University of California, Santa Cruz, Imperial College London, and National Taiwan University have appeared in journals associated with American Geophysical Union, demonstrating Yokosuka’s role in advancing understanding of subduction processes, methane hydrate occurrences, and deep-sea biodiversity.
The vessel operates with a complement drawn from professional mariners, technical engineers, and scientific staff coordinated by Jamstec’s operations division, interacting with administrative oversight from the Cabinet Office (Japan) and funding agencies such as Japan Science and Technology Agency. Typical cruises include certified marine technicians, ROV pilots trained under standards used by institutions like WHOI and Scripps, and multidisciplinary teams of scientists affiliated with universities and research institutes including Tohoku University Tohoku Earthquake Research Center and the National Institute of Advanced Industrial Science and Technology.
Yokosuka has been involved in notable rapid-response deployments following the 2011 Tōhoku earthquake and tsunami, contributing to seafloor surveys and aftershock investigations similar to missions by RV Kairei. The ship has supported discoveries of new vent systems and assisted in recovery and survey tasks related to maritime incidents in the Western Pacific. Safety and incident records comply with standards promoted by International Labour Organization maritime conventions and have led to procedural updates in collaboration with maritime authorities including Japan Coast Guard and port administrations.
Category:Research vessels of Japan Category:Jamstec vessels