Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15, Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan; E-Mails:
Sensors (Basel). 2009;9(11):9241-54. doi: 10.3390/s91109241. Epub 2009 Nov 18.
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.
相模湾是日本的一个活动构造区。1993 年,在相模湾距八丈岛约 7 公里的 1175 米深处部署了一个实时深海海底观测站,以监测地震活动和其他地球物理现象。摄像机监测与构造活动有关的生物活动。该观测系统于 2000 年进行了全面翻新。2005 年 1 月安装了海底电磁仪 (OBEM)、海底差压计 (DPG) 系统和海底重力仪 (OBG);同年 2 月开始运行。2006 年 4 月发生的一次 M5.4 级地震引发了海底滑坡,滑坡到达八丈岛观测站,移动了一些传感器。摄像机拍摄了泥石流的电影;OBEM 和其他传感器检测到泥石流发生时的明显变化。尽管 DPG 和 OBG 已于 2008 年 1 月回收,但 OBEM 仍在继续获取数据。