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KDDI Laboratory, KDDI Co. Ltd., Kasumigaseki, Saitama, Japan
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- PublicationOpen AccessAn Experimental Multi-disciplinary observatory (VENUS) at the Ryukyu Trench using the Guam-Okinawa Geophysical Submarine Cable(2006-06-15)
; ; ; ; ; ; ; ;Kasahara, J.; Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-0032, Japan Now at Tono Geoscience Center, Akeyo-cho, Mizunami, Japan, ri2j_kshr@ybb.ne..jp ;Iwase, R.; Japan Marine Science and Technology Center (JAMSTEC), Yokosuka, Japan ;Nakatsuka, T.; National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba, Japan ;Nagaya, Y.; Hydrographic and Oceanographic Department, Japan Coast Guard, Tokyo, Japan ;Shirasaki, Y.; Institute of Industry and Technology, University of Tokyo, Tokyo, Japan ;Kawaguchi, K.; Japan Marine Science and Technology Center (JAMSTEC), Yokosuka, Japan ;Kojima, J.; KDDI Laboratory, KDDI Co. Ltd., Kasumigaseki, Saitama, Japan; ; ; ; ; ; A multidisciplinary Ocean Bottom Observatory (MDOBO) was installed on VENUS (Versatile Eco-monitoring Network by Undersea-cable System) a depth of 2,170 meters on the slope of the Ryukyu Trench. In this context, “Eco-“ refers to both economic (e.g., earthquake hazard mitigation) and ecological motivation. The first step in this instillation was to insert a telemetry/power system into the submarine coaxial cable; this system could then service the MODOBO, which consist of seven major bottom sensor packages. During August-September 1999, using a deep-towed unit and both manned and unmanned submersibles coupled with precise ship navigation, the MDOBO system and its attendant cables were deployed over a range of distances from 80 m to 1 km from the telemetry system, with several meter allowance for navigational uncertainty in positioning. The unmanned submersible then extended the multi-conductor extension cables from the instrument units toward the telemetry system and connected them to undersea mateable connectors on a junction box installed on the submarine cable. The MDOBO collected one and half months of continuous records. Several kinds of useful data were collected after installation, including an aftershock (Ms=6.1) of the 1999 Chi-Chi earthquake (Ms=7.7) in Taiwan.155 459