Instrument development for geophysical monitoring at cabled seafloor observatories

国际和平研究所要求提供资金，使现有的地球物理仪器能够在光缆网络上运行。改装后的仪器包将在火星电缆上进行为期6个月的测试，然后将准备部署在美国海王星上的拟议节点地点轴海山。该仪器包将包括一个海底压力记录器(BPR)和一个精密倾斜仪，这两个仪器都旨在监测海底火山区因地下岩浆运动而导致的通货膨胀或通货紧缩。该项目的技术挑战是开发所需的电力和数据通信方案，以将这些自主的、由电池供电的内部记录仪器转换为光纤网络上完全嵌入的交互式仪器。拟议的工作建立在之前在轴海山成功的(非电缆)监测工作的基础上，这些监测工作表明，轴海山目前正以每年10-20厘米的速度膨胀，并正在为下一次喷发做准备。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来更好地了解海底活火山的火山旋回。就其本身而言，拟议的项目将为开发使用这些(和其他)电缆传感器的其他电缆系统提供重要指导。该大学已同意支持一名研究生开展拟议的项目，这一事实确保该项目将有助于海洋观测专业人员的教育。对未来感兴趣的其他方面包括Axial的时间序列通胀/倾斜与EPR上建议的9 50‘N类似工作的比较。在太平洋西北部的俯冲带和甲烷水合物区域以及在海啸多发地区部署类似的设备也有潜在的增值价值，在这些地区，这类仪器可以加强自然灾害的工作。PI似乎愿意提供许多潜在的公众访问这些数据的机会。

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.