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

Sensors

Takafumi Kasaya³  Kyohiko Mitsuzawa³  Tada-nori Goto³  Ryoichi Iwase³  Keizo Sayanagi²  Eiichiro Araki³  Kenichi Asakawa³  Hitoshi Mikada⁴  Tomoki Watanabe¹  Ichiro Takahashi¹ 

[1] Marine Works Japan Ltd. / c/o JAMSEC YES, 3173-25, Syowa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan; E-Mails:;Institute of Oceanic Research and Development, Tokai University, 3-20-1, Orido, Shimizu-ku, Shizuoka-shi, 424-8610, Japan; E-Mail:;Japan Agency for Marine–Earth Science and Technology (JAMSTEC), 2-15, Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan; E-Mails:;Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto, 615-8540, Japan; E-Mail:

关键词: multidisciplinary observation;    expandable submarine cabled station;    ocean bottom electro-magnetometer;   

DOI  :  10.3390/s91109241

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.