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: 1155305
• 负责人: C. David Chadwell
• 金额: $ 20.4万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 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=1155305&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 请求提供资金，通过开发和展示廉价、永久的海底基准来延长海底大地测量的寿命。该基准将提供与海底持续数十年（可能更长时间）的物理联系，可以在其上以毫米分辨率重复放置和移除大地测量传感器。使用海底大地测量技术估计的全球坐标将保留在基准上，以便在传感器发生故障或过时时进行互换，或者将传感器移除并在其他地方使用，同时保持参考基准的一系列连贯位置。该基准将被设计为通过带有传感器的电线降低到海底。这些传感器将能够通过从船上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回收。传感器连接到基准的持续时间将持续几天到几年，具体取决于实验的具体需要。回收的传感器可以在其他地点重复使用，或者将来在同一地点再次使用。 更广泛的影响：如果可以开发高精度、廉价、运动式的海底大地测量，那么可以用这样的方法进行研究该系统可以改变我们对俯冲带和巨型逆冲地震的认识。