Collaborative Research: Permanent seafloor benchmarks for geodetic measurements of horizontal and vertical plate motion

合作研究：水平和垂直板块运动大地测量的永久海底基准

• 批准号: 1155006
• 负责人: Spahr Webb
• 金额: $ 7.09万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-15 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1155006&HistoricalAwards=false
• 关键词: Collaborative; Research; Permanent; seafloor; benchmarks

The PI's request funding to increase the longevity of seafloor geodetic measurements by developing and demonstrating an inexpensive, permanent seafloor benchmark. The benchmark will provide a physical tie to the sea floor lasting for decades (perhaps longer) on which geodetic sensors can be repeatedly placed and removed with millimeter resolution. Global coordinates estimated with seafloor geodetic techniques will remain attached to the benchmark allowing for the interchange of sensors as they fail or become obsolete, or for the sensors to be removed and used elsewhere, all the while maintaining a coherent series of positions referenced to the benchmark. The benchmark will be designed to be lowered via a wire to the seafloor with sensors attached. The sensors will be capable of being recalled via an acoustic command sent from a ship to release from the benchmark and freely float to the sea surface for recovery. The duration of the sensor attachment to the benchmark will last from a few days to a few years depending on the specific needs of the experiment. The recovered sensors are then available to be reused at other locations, or again at the same site in the future.Broader Impacts:If high accuracy, cheap, campaign-style seafloor geodesy can be developed, the studies that could be done with such a system could transform our knowledge of subduction zones and megathrust earthquakes.

PI要求提供资金，通过开发和演示廉价的永久性海底基准来延长海底大地测量的寿命。该基准将提供一个持续数十年（也许更长时间）的海底物理纽带，大地测量传感器可以以毫米分辨率重复放置和移除。用海底大地测量技术估计的全球坐标将继续附在基准上，以便在传感器失灵或过时时交换传感器，或将传感器移到别处使用，同时保持一系列以基准为参照的连贯位置。该基准将被设计为通过一根连接有传感器的电线下降到海底。传感器将能够通过船舶发送的声音命令被召回，从基准释放并自由漂浮到海面进行恢复。根据实验的具体需要，传感器连接到基准的持续时间将从几天到几年不等。更广泛的影响：如果能够开发出高精度、低成本的海底大地测量方法，那么利用这种系统进行的研究将改变我们对俯冲带和巨型逆冲断层地震的认识。