NDLI: Multidisciplinary observations at an expandable sub-marine cabled station off the Hatsushima island, the Sagami bay, Japan

Content Provider	IEEE Xplore Digital Library
Author	Kasaya, T. Mitsuzawa, K. Goto, T.-n. Sayanagi, K. Araki, E. Asakawa, K. Iwase, R. Mikada, H. Nagao, T.
Copyright Year	2007
Description	Author affiliation: Japan Agency for Marine-Earth Sci. & Technol. (JAMSTEC), Yokosuka (Kasaya, T.)
Abstract	Western part of Sagami Bay is one of the active tectonic areas in Japan. In this area, Teishi Knoll, volcanic scamount, erupted in 1989 and the earthquake swarms occurs repeatedly every few years in the eastern coast of the Izu Peninsula. The real-time deep sea floor observatory was deployed about 7 km off Hatsushima Island, Sagami Bay, at a depth of 1174 m in 1993 to monitor seismic activities, underwater pressure, water temperature and deep currents. The video camera and lights were also mounted in the observatory to monitor the relations among biological activities associated with the tectonic activities. The observation system including submarine electro-optical cable with a length of 8 km was completely renewed in 2000. The several underwater-mateable connectors are installed in the new observatory for additional observation instruments. An ocean bottom electro-magnetic meter(OBEM), precise pressure sensor and ocean bottom gravity meter were installed using ROV Hyper-Dolphin in the cruise of R/V Natsushima from January 9 to 14, 2005. We started to operate them at February 10, 2005 after checking those of data qualities. Observed data have been sent to Yokohama institute, JAMSTEC. Around the Sagami bay, seismic activity is very high. A large earthquake (M5.4) occurred off Izu peninsula at April 21, 2006, and submarine land slide was then generated. Generated mud flow reached to the Hatsushima station, and moved positions of some sensors. The video camera was able to take a movie of mud flow. An OBEM and other sensors also detected some distinctive changes with the mud flow.
Starting Page	674
Ending Page	676
File Size	2148798
Page Count	3
File Format	PDF
ISBN	1424412072
DOI	10.1109/UT.2007.370819
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-04-17
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Observatories Underwater cables Earthquakes Monitoring Cameras Underwater vehicles Sea floor Ocean temperature Connectors Instruments
Content Type	Text
Resource Type	Article

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