Development of a seafloor acoustic ranging system toward the seafloor cable network system

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• 作者：Yukihito Osada ; Motoyuki Kido ; Hiromi Fujimoto ; Yoshiyuki Kaneda
• 关键词：Seafloor crustal movement ; Acoustic ranging ; Seafloor cable network system
• 刊名：Ocean Engineering
• 出版年：2008
• 出版时间：October 2008
• 年：2008
• 卷：35
• 期：14-15
• 页码：1401-1405
• 全文大小：399 K

文摘

We have developed a seafloor acoustic ranging system as a possible future application to monitoring seafloor crustal movement with the DONET (Development of Dense Ocean-floor Network System for Earthquake and Tsunami) cabled observatory system. In 2007 we carried out an experiment for the seafloor acoustic ranging system. We deployed two precision acoustic transponders (PXPs) with about 750 m spacing in Kumano-nada at a water depth of about 2035 m. We collected 660 ranging data in this one-day experiment. The round-trip travel time shows a variation with peak-to-peak amplitude of about 25 mm in the range. It was confirmed that most of the variation could be explained by the change in sound speed estimated from measured temperature and pressure. The remaining fluctuation in the acoustic measurements is ±2 mm.