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

基本信息

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

项目摘要

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的要求资金通过开发和证明廉价，永久的海底基准来增加海底大地测量的寿命。基准测试将为持续数十年（可能更长）的海底提供物理领带，可以通过毫米分辨率重复放置并去除地球传感器。用海底大地测量技术估计的全球坐标将保持附着在基准上，允许传感器在失败或过时时进行交换，或者在其他地方卸下和使用传感器，同时维持一系列连贯的位置，引用了基准标准的一系列位置。基准将设计为通过连接传感器的电线降低到海底。传感器将能够通过从船上发送的声学命令从基准释放，然后自由漂浮到海面以恢复。传感器附着在基准上的持续时间将持续几天到几年，具体取决于实验的特定需求。然后，恢复的传感器可以在其他位置重复使用，或将来再次在同一地点进行重复。系统可以改变我们对俯冲区和大型地震的了解。