Sensors 2009, 9(11), 9241-9254; doi:10.3390/s91109241
Article

Trial of Multidisciplinary Observation at an Expandable Sub-Marine Cabled Station “Off-Hatsushima Island Observatory” in Sagami Bay, Japan

Takafumi Kasaya 1,* email, Kyohiko Mitsuzawa 1 email, Tada-nori Goto 1,3 email, Ryoichi Iwase 1 email, Keizo Sayanagi 2 email, Eiichiro Araki 1 email, Kenichi Asakawa 1 email, Hitoshi Mikada 3 email, Tomoki Watanabe 4 email, Ichiro Takahashi 4 email and Toshiyasu Nagao 2 email
1 Japan Agency for Marine–Earth Science and Technology (JAMSTEC), 2-15, Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan 2 Institute of Oceanic Research and Development, Tokai University, 3-20-1, Orido, Shimizu-ku, Shizuoka-shi, 424-8610, Japan 3 Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto, 615-8540, Japan 4 Marine Works Japan Ltd. / c/o JAMSEC YES, 3173-25, Syowa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
* Author to whom correspondence should be addressed.
Received: 25 September 2009; in revised form: 2 November 2009 / Accepted: 7 November 2009 / Published: 18 November 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Japan)
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Abstract: Sagami Bay is an active tectonic area in Japan. In 1993, a real-time deep sea floor observatory was deployed at 1,175 m depth about 7 km off Hatsushima Island, Sagami Bay to monitor seismic activities and other geophysical phenomena. Video cameras monitored biological activities associated with tectonic activities. The observation system was renovated completely in 2000. An ocean bottom electromagnetic meter (OBEM), an ocean bottom differential pressure gauge (DPG) system, and an ocean bottom gravity meter (OBG) were installed January 2005; operations began in February of that year. An earthquake (M5.4) in April 2006, generated a submarine landslide that reached the Hatsushima Observatory, moving some sensors. The video camera took movies of mudflows; OBEM and other sensors detected distinctive changes occurring with the mudflow. Although the DPG and OBG were recovered in January 2008, the OBEM continues to obtain data.
Keywords: multidisciplinary observation; expandable submarine cabled station; ocean bottom electro-magnetometer

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Cite This Article

MDPI and ACS Style

Kasaya, T.; Mitsuzawa, K.; Goto, T.-N.; Iwase, R.; Sayanagi, K.; Araki, E.; Asakawa, K.; Mikada, H.; Watanabe, T.; Takahashi, I.; Nagao, T. Trial of Multidisciplinary Observation at an Expandable Sub-Marine Cabled Station “Off-Hatsushima Island Observatory” in Sagami Bay, Japan. Sensors 2009, 9, 9241-9254.

AMA Style

Kasaya T, Mitsuzawa K, Goto T-N, Iwase R, Sayanagi K, Araki E, Asakawa K, Mikada H, Watanabe T, Takahashi I, Nagao T. Trial of Multidisciplinary Observation at an Expandable Sub-Marine Cabled Station “Off-Hatsushima Island Observatory” in Sagami Bay, Japan. Sensors. 2009; 9(11):9241-9254.

Chicago/Turabian Style

Kasaya, Takafumi; Mitsuzawa, Kyohiko; Goto, Tada-nori; Iwase, Ryoichi; Sayanagi, Keizo; Araki, Eiichiro; Asakawa, Kenichi; Mikada, Hitoshi; Watanabe, Tomoki; Takahashi, Ichiro; Nagao, Toshiyasu. 2009. "Trial of Multidisciplinary Observation at an Expandable Sub-Marine Cabled Station “Off-Hatsushima Island Observatory” in Sagami Bay, Japan." Sensors 9, no. 11: 9241-9254.

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