1991 Fiscal Year Final Research Report Summary
Preliminary study of ocean bottom geoscience station using trans-Pacific telecommunication cable
| Project/Area Number |
01420010
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体地球物理学
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| Research Institution | Earthquake Research Instutute, University of Yokyo |
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Principal Investigator |
YUKUTAKE Takeshi Earthquake Research Institute, Univ. Tokyo, Prof., 地震研究所, 教授 (90012898)
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| Co-Investigator(Kenkyū-buntansha) |
UTADA Hisashi Earthquake Research Institute, Univ. Tokyo, Assoc. Prof., 地震研究所, 助教授 (70134632)
SHIMAZAKI Kunihiko Earthquake Research Institute, Univ. Tokyo, Prof., 地震研究所, 教授 (50012951)
TSUJI Yoshinori Earthquake Research Institute, Univ. Tokyo, Assoc. Prof., 地震研究所, 助教授 (30183479)
HAMANO Yozo Earth Plan Phys., Faculty of Science, Univ. Tokyo Prof., 理学部, 教授 (90011709)
KASAHARA Junzo Earthquake Research Institute, Univ. Tokyo Assoc. Prof., 地震研究所, 教授 (70012953)
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| Project Period (FY) |
1989 – 1991
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| Keywords | reuse of submarine cable / deep-sea technology / global seismology / ocean bottom seismometer / ocean bottom magnetometer / ocean bottom pressure gauge / ocean bottom precision thermometer / date telemetry technology |
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| Research Abstract |
The purpose of this project is to study the feasibility of submarine telecommunication cable re-use, specially GeO-TOC cable which runs between Ninomiya and Guam, build a prototype submarine instrument aiming to test the above purpose and examine this prototype instrument. The submarine telecommunication system was studied and key factors in the submarine cable system were reviewed. A prototype instrument equipping seismic sensors, geomagnetic sensors, a tsunami sensor and two kinds of thermometers was built. The 3 component of velocity type and acceleration types are used as seismic sensor. Three component fluxgate magnetometer and a proton-magnetometer are used as geomagnetic purpose. A differential hydrophone is used both as tsunami and seismic purposes. Two different kinds of thermometers, quartz and semiconductor types are used. The seismic signals are digitized by 20 bit A/D with 10OHz., are transmitted to the mixture part and are multiplexed with slow data such as geomagnetic. differential hydrophone and thermometer outputs which are sampled by 16 bit A/D with I Hz. All signals are transmitted to the land station through coaxial cable and are saved in DAT by real time. This prototype instrument was successfully tested at the ocean bottom 1 km off the coast of Hiratsuka, Japan. This experiment proved the powerfulness of these sensors in the real observation in the situation of co-observation of different items, but there remained the necessity to reduce the power consumption of A/D converter and its controller.
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