On Board Cruise Report YOKOSUKA Cruise: YK13-01 .On Board Cruise Report YOKOSUKA Cruise: YK13-01

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  • On Board Cruise Report

    YOKOSUKA Cruise: YK13-01

    Rodriguez Triple Junction, Indian Ocean

    Jan.16-Feb.4, 2013

    Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

  • Contents

    1. Purpose 2. Participants 2-1. Onboard Scientists 2-2. Onboard technicians 2-3. Scientists on land 2-4. Crew and Operation Team 3. Cruise Information 3-1. Basic Information 3-2. Research Area 3-3. Ship Log 4. Instruments 4-1. OBEM (Ocean Bottom Electro-Magnetometer) 4-2. OBS (Ocean Bottom Seismometers) 4-3. OBSP (Ocean Bottom Seismometer with Pressure gauge) 4-4. OBSM (Ocean Bottom Seismometers with Magnetometer) 4-5. Equipment for active seismic surveys 5. Preliminary Results 5-1. Deployment of ocean bottom instruments 5-2. Seismic Reflection and Refraction Survey 5-3. Surface Geophysical Survey 5-4. Checking on TRITON Buoy No.18 6. Summary Acknowledgement Notice on using

  • 1. Purpose We deploy four different types of instruments; OBEM (Ocean Bottom

    Electro-Magnetometer), OBS (Ocean Bottom Seismometer), OBSP (Ocean Bottom Seismometer with Pressure gauge), and OBSM (Ocean Bottom Seismometers with Magnetometer). The OBEM and OBSM are used to observe magnetic and electric field variations at the ocean bottom across the central and southeast Indian Ridges near the Rodriguez Triple Junction. The OBSs including the OBSP and OBSMs are used to conduct seismic observation at the ocean bottom near the Kairei hydrothermal vent site in the first segment of the central Indian Ridge. These observations continue up to the recovery of the instruments during another Yokosuka cruise in this March. The OBSs are also used for active seismic surveys to investigate seismic velocity structure during this cruise and the recovery cruise. Further, we conduct surface geophysical survey mainly during night and transit times. The central and southeast Indian Ridges spreading system shows different spreading rate with different topographic characters, which give the one of the best locations to investigate dependence of seafloor-spreading system on a parameter of spreading rate. In the slower spreading central Indian Ridge, the Kairei vent site exist and extrude hydrothermal fluid with richer hydrogen content compared to other hydrothermal vents in the world. The observed data will be analyzed to derive upper mantle structure, crustal structure, and hypocenter distribution, which will provide important constraint on following four main points to understand the seafloor-spreading system; 1) imaging melt delivery to the spreading axis, 2) production and character of the crust, 3) relationship between melt supply and crustal formation, and 4) pathway and heat source for hydrothermal circulation with related to its formation. Moreover, we check the TRITON buoy No.18, which is missing after 3 Dec. 2012 due to no satellite communications.

  • 2. Participants 2-1.Onboard Scientists Nobukazu Seama (Professor; Chief scientist/Representative of the science party) Department of Earth and Planetary Sciences, Kobe University Tomoaki Yamada (Assistant Professor) Earthquake Research Institute The University of Tokyo Tetsuo Matsuno (Postdoctoral Research Scientist) Geoscience Group National Institute of Polar Research Division of Research and Education Masayuki Yamaguchi (Engineer) Japan Agency for Marine-Earth Science and Technology Haruka Shindo (Graduate Student) Graduate School of Science Kobe University Yui Noguchi (Graduate Student) Graduate School of Science Chiba University Takahiro Baba (Graduate Student) Graduate School of Science Kobe University Akihiro Kono (Graduate Student) Graduate School of Science Chiba University Eri Iizuka (Undergraduate Student) Faculty of Science Kobe University 2-2.Onboard technicians Satoshi Okada (Marine Technician) Marine Science Department, Nippon Marine Enterprises, Ltd. Keisuke Matsumoto (Marine Technician) Marine Observation Section, Department of Marine Science Marine Work Japan Ltd. Mitsuteru Kuno (Marine Technician) Marine Science Department, Nippon Marine Enterprises, Ltd. Hisanori Iwamoto (Marine Technician) Marine Science Department, Nippon Marine Enterprises, Ltd.

  • Toshimasa Nasu (Marine Technician) Marine Science Department, Nippon Marine Enterprises, Ltd. 2-3. Scientists on land Kyoko Okino, Atmosphere and Ocean Research Institute, University of Tokyo Toshinori Sato, Earth Sciences, Chiba University Masanao Shinohara, Earthquake Research Institute, University of Tokyo Yoshifumi Nogi, National Institute of Polar Research Kimihiro Mochizuki, Earthquake Research Institute, University of Tokyo Takeshi Tsuji, Kyushu University 2-4. Crew and Operation Team Captain Shinya Ryono Chief Officer Tatsuo Adachi 2nd Officer Takeshi Egashira 3rd Officer Shunsuke Fujii Chief Engineer Eiji Sakguchi 1st Engineer Takashi Ota 2nd Engineer Kenta Ikeguchi 3rd Engineer Katsuto Yamaguchi Chief Electronics Operator Taketo Hattori 2nd Electronics Operator Yoshikazu Kuramoto Boat Swain Kazuo Abe Able Seaman Masanori Ohata Able Seaman Kaito Murata Able Seaman Takuya Miyashita Sailor Shinsuke Uzuki Sailor Ryoma Tamura Sailor Kenta Nasu No.1 Oiler Kouzo Miura Oiler Keita Funawatari Oiler Yuji Higashigawa Assistant Oiler Makoto Kozaki Assistant Oiler Eiji Aratake Chief Steward Ryuei Takemura Steward Yoshio Okada Steward Seiji Honda Steward Kazuma Sonoda Steward Kei Ito

  • 3. Cruise Information 3-1. Basic Information

    Cruise ID: YK13-01 Name of vessel: YOKOSUKA Title of the cruise: Seafloor spreading dynamics near the Rodriguez Triple Junction: from

    mantle to hydrothermal activity, part 1 Title of the proposal: Crustal production process of slow spreading ridge system: Any

    relation to make hydrogen rich hydrothermal fluid? Cruise period: Jan.16-Feb.4, 2013 Ports of call: Singapore - Port Louis

    3-2. Research area Our research area is the Rodriguez Triple Junction, Indian Ocean (Figure 3-2-1). The ship tracks of the cruise are shown in Figure 3-2-2.

    Figure 3-2-1. Bathymetry map of our research area (bottom) and its location shown by red square in the top figure.

  • Figure 3-2-2. Ship tracks of the cruise. Our research area is shown by square.

  • 3-3. Ship Log

    Date Local Time Description

    Position/Weather/Wind/Sea condition

    15-Jan-13 13:00 scientists onboard 1/15 12:00 (UTC+8h)

    15:00-15:40 lecture for life of shipboard and immiguration 01-15.7N,103-49.1E

    Fine but cloudy NNE-3 (Gentle breeze) 1 (Calm) 0 (No swell) Visibly: 8' 16-Jan-13 08:30-09:05 scientific meeting 1/16 12:00 (UTC+8h) 10:00 depature from cruise center, Singapore 01-14.0N,103-27.5E Cloudy NE-4 (Moderate breeze) 2 (Sea smooth) 1 (Low swell sea) Visibly: 7' 17-Jan-13 tansit to triton No.18 buoy 1/17 12:00 (UTC+8h) 24:00 shift local time to UTC+7h 04-51.0N,099-02.0E Fine but cloudy NE-5(Fresh breeze) 3 (Sea slight) 1 (Low swell sea) Visibly: 8' 18-Jan-13 tansit to triton No.18 buoy 1/18 12:00 (UTC+7h) 16:40-17:00 pray to KONPIRASAN for safety cruise 05-34.0N,094-04.0E 24:00 shift local time to UTC+6h Fine but cloudy ENE-7 (Near gale) 5 (Sea rough) 4 (Moderate long) Visibly: 8' 19-Jan-13 tansit to triton No.18 buoy 1/19 12:00 (UTC+6h) 01-29.0N,091-45.0E Fine but cloudy SW-2 (Light breeze) 2 (Sea smooth) 1 (Low swell sea) Visibly: 8'

    20-Jan-13 04:00 arrived at triton No.18 buoy point and search buoy 1/20 12:00 (UTC+6h)

    8:55-09:30 carried out acoustic communication to bottom of buoy mooring system 01-36.0S,089-52.0E

    11:50 finish searching buoy Fine but cloudy

  • transit to research area 13:11-13:35 figure of eight turn West-2 (Light breeze) 2 (Sea smooth) 1 (Low swell sea) Visibly: 8' 21-Jan-13 transit to research area 1/21 12:00 (UTC+6h) 05-32.0S,086-59.0E Fine but cloudy WSW-5 (Fresh breeze) 4 (Sea moderate) 2 (Low swell long) Visibly: 8' 22-Jan-13 transit to research area 1/22 12:00 (UTC+6h) 14:30-15:30 onboard tour for student 10-11.0S,083-19.0E 24:00 shift local time to UTC+5h Fine but cloudy WSW-3 (Gentle breeze) 2 (Sea smooth) 2 (Low swell long) Visibly: 8' 23-Jan-13 transit to research area 1/23 12:00 (UTC+5h) 08:30-08:53 figure of eight turn 14-44.0S,079-41.0E Fine but cloudy ESE-5 (Fresh breeze) 3 (Sea slight) 2 (Low swell long) Visibly: 8' 24-Jan-13 transit to research area 1/24 12:00 (UTC+5h) 19-03.5S,076-11.0E Fine but cloudy East-5 (Fresh breeze) 3 (Sea slight) 2 (Low swell long) Visibly: 8' 25-Jan-13 transit to research area 1/25 12:00 (UTC+5h) 13:00-13:30 scientific meeting 23-17.0S,072-40.0E 18:00-18:22 figure of eight turn Fine but cloudy ENE-5 (fresh breeze) 4 (Sea moderate) 2 (Low swell long) Visibly: 8' 26-Jan-13 04:13 released XBT 1/26 12:00 (UTC+5h) 05:11 deployed OBEM (EM1) 25-52.5S,070-09.0E 06:44 deployed OBEM (EM2) Fine but cloudy 08:09 deployed OBEM (EM3) NE-5 (Fresh breeze)

  • 09:31 deployed OBEM (EM4) 3 (Sea slight) 10:36 deployed OBEM (EM5) 2 (Low swell long) 11:14 deployed OBEM (EM6) Visibly: 8' 11:52 deployed OBEM (EM7) 12:57 deployed OBEM (EM8) 14:21 deployed OBEM (EM9) 15:45 deployed OBEM (EM10) 16:02-16:23 figure of eight turn 17:23- comced MBES survey 27-Jan-13 05:18 deployed OBEM (EM16) 1/27 12:00 (UTC+5h) 06:42 deployed OBEM (EM15) 25-17.0S,070-22.0E 08:12 deployed OBEM (EM14) Fine but cloudy 09:08 deployed OBEM (EM13) NE-5 (F