Trial exploration for hydrothermal activity using acoustic measurements at the North Iheya Knoll
Trial exploration for hydrothermal activity using acoustic measurements at the North Iheya Knoll
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DOI：
10.2343/geochemj.2.0389
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发表时间：
2015-01-01
影响因子：
0.8
通讯作者：
Nakamura, Kentaro
中科院分区：
文献类型：
--
作者：
Kasaya, Takafumi;Machiyama, Hideaki;Nakamura, Kentaro
由于热液喷口暴露的气泡和热水在冷海水中会产生声阻抗异常，利用声学设备测量气泡和热液活动的方法近年来引起了研究人员的兴趣。我们尝试了一种新的热液勘探，使用安装在船体上的多波束测深仪(MBES)和安装在AUV Urashima上的高频MBES系统，作为包括地球物理勘探在内的全面热液矿床调查过程的第一阶段的一种方法。使用MBES系统的调查是在北Iheya Knoll进行的。首先，我们利用安装在船体上的MBE，在伊赫亚诺尔北部的两个区域发现了迄今尚未确定的热液活动。然后，在AUV潜水过程中获得的MBES数据提供了新的热液活动区的详细位置。以前未知的热液喷口的存在是通过ROV潜水利用我们估计的伊海亚诺尔北部的羽流位置数据确定的。这些成果清楚地表明，舰载MBE声学测量和高频MBE载具作为热液勘探的一种方法是有用的。
A survey method using acoustic equipment has attracted recently interest of researchers for the research of gas bubbles and hydrothermal activity because gas bubbles and hot water exposed from hydrothermal vents produce acoustic impedance anomalies in cold seawater. We tried a new hydrothermal exploration using a hull-mounted Multi Beam Echo Sounder (MBES) and a high-frequency MBES system mounted on AUV URASHIMA as one approach in the first stage of a comprehensive hydrothermal deposit survey process including geophysical exploration. The surveys using the MBES system were conducted at the North Iheya Knoll. First, we discovered heretofore unidentified hydrothermal activity at two areas of the North Iheya Knoll using hull-mounted MBES. Then, MBES data obtained during the AUV dive provided detailed positions of new hydrothermal activity zone. The existence of previously unknown hydrothermal vent was identified through ROV dives using our estimated plume position data for the North Iheya Knoll. These achievements demonstrate clearly that the acoustic survey using shipboard MBES and a vehicle with high-frequency MBES are useful as one approach for hydrothermal exploration.