OBEM (Ocean Bottom Electro-Magnetometer)の開発

２００２年

KR02-14「かいれい」単独調査航海にて

２００１年

YK01-11「よこすか」単独調査にて

２０００年

９月砕氷艦しらせにて

１９９９年

淡青丸KT99-15航海にて、設置直前．


九大傭船にて、回収直後．

１９９８年

淡青丸KT98-9航海にて

Newly developed ocean bottom electro-magnetometer

Nobukazu Seama and Kiyoshi Baba (Both at Graduate School of Science and Technology, Chiba University, Yayoi, Inage, Chiba 263, Japan; Phone: +81-43-290-2850; Email: seama@earth.s.chiba-u.ac.jp); Shigeo Matsuda (Clover Tech Co., Ltd., Japan)

We have developed a new type of ocean bottom electro-magnetometer that is suitable for the array electromagnetic study on the ocean bottom in the future. This instrument can measure horizontal two components of the electric and magnetic field and has four main features. First, it is easy to handle, because of computer control, much smaller size compared to conventional ones, artifice of electrode arms, and so on. Second, it has high performance: 1 second sampling with minimum digit of 0.002 micro-volt/meter for the electric field and of 0.01 nT for the magnetic field. Third, it is low cost, because we mainly use standard or mass-produced parts. Finally, it can be used in ocean bottom for three months. We tested a prototype of the instrument on the ocean bottom (2080 meters in depth) for 5 days and successfully recovered it during the KT98-9 cruise

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