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

PI要求资助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使用寿命。该基准将为海床提供一个持续数十年（也许更长）的物理连接，大地测量传感器可以在其上以毫米分辨率反复放置和移除。使用海底大地测量技术估计的全球坐标将保持与基准相连接，允许在传感器失效或过时时交换传感器，或者传感器被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。基准将被设计成通过连接传感器的电线降至海底。这些传感器将能够通过船舶发出的声音命令被召回，从基准上释放出来，并自由漂浮到海面上进行回收。根据实验的具体需要，传感器附着在基准上的持续时间从几天到几年不等。然后，回收的传感器可以在其他地点重新使用，或者将来在同一地点再次使用。更广泛的影响：如果能够开发出高精度、廉价、运动式的海底大地测量学，那么可以用这种系统进行的研究可能会改变我们对俯冲带和大型逆冲地震的认识。

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.