Instrument development for geophysical monitoring at cabled seafloor observatories

PI要求提供资金，以调整现有的地球物理仪器，使其在光纤电缆网络上运行。改装后的仪器包将在MARS电缆上进行六个月的测试，之后将准备在美国海王星上部署在轴海山的拟议节点上。该仪器包将包括一个海底压力记录仪和一个精密倾斜仪，这两个仪器都是为了监测地下岩浆运动引起的海底火山区的膨胀或收缩。该项目的技术挑战是开发所需的电源和数据通信方案，将这些自主的、电池供电的、内部记录的仪器转换为光纤网络上的完全嵌入式、交互式仪器。拟议的工作建立在以前成功的（非电缆）监测工作轴海山，这表明它目前正在膨胀10-20厘米/年，并正在建设其下一次喷发。科学目标是通过量化岩浆供应速率并发现它们如何随时间变化，更好地了解活海底火山的火山循环。 拟议的传感器包将是最终系统的一个重要组成部分，将使人们能够更深入地了解OOI/RSN现场的地球物理过程。就其本身而言，拟议的项目将提供重要的指导，在其他有线系统的发展，采用这些（和其他）有线传感器。联合国大学已同意支助一名研究生开展拟议项目，这确保了该项目将有助于海洋观测专业人员的教育。未来感兴趣的其他方面包括轴的时间序列通货膨胀/倾斜的比较与类似的工作提出在9 50' N的EPR。在太平洋西北部的俯冲带和甲烷水合物地区以及在海啸发生地区部署类似设备也有可能增加价值，在这些地区，此类仪器可以加强自然灾害工作。PI似乎愿意提供这些数据，公众可以访问这些数据。

The PI requests funding to adapt existing geophysical instruments to operate on a fiber optic cable network. The adapted instrument package will be tested on the MARS cable for six months, and afterward will be ready to deploy on US Neptune, at the proposed node site at Axial Seamount. The instrument package will include a bottom pressure recorder (BPR) and a precision tiltmeter, both designed to monitor inflation or deflation in submarine volcanic areas caused by magma movements underground. The technical challenge of this project is to develop the power and data communication schemes required to convert these autonomous, battery-powered, and internally recording instruments to fully embedded, interactive instruments on a fiber-optic network. The proposed work builds on previous successful (non-cabled) monitoring efforts at Axial Seamount, which show that it is currently inflating at 10-20 cm/yr and is building toward its next eruption. The scientific goal is to better understand volcanic cycles at active submarine volcanoes by quantifying magma supply rates and discovering how they vary over time.Broader Impacts: The proposed sensor package will represent an important component to the eventual system that will allow for a deeper understanding of the geophysical processes at the OOI/RSN site. On its own, the proposed project will provide important guidance in the development of other cabled systems employing these (and other) cabled sensors. The fact that the University has agreed to support a graduate student in the conduct of the proposed project ensures that the project will contribute to the education of ocean observation professionals. Additional aspects of future interest include Axial's time-series inflation/tilt comparisons with similar work proposed at 9 50' N on the EPR. There is also potential value added by similar equipment deployments in subduction zones and methane hydrate areas off the Pacific NW, as well as in tsunamigenic areas where such instruments can augment natural hazards work. There is much potential public access to these data that the PI seems willing to provide.