Exploring the absolute pressure gauge data from the Cascadia Initiative OBS deployment for transient changes in seafloor elevation

探索卡斯卡迪亚倡议 OBS 部署的绝对压力计数据，以了解海底高度的瞬态变化

• 批准号: 1459691
• 负责人: Spahr Webb
• 金额: $ 9.66万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-04-15 至 2017-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1459691&HistoricalAwards=false
• 关键词: Exploring; absolute; pressure; gauge; data

Part 1The proposed work will study the use of pressure gauges for geodetic observations to monitor vertical deformation in the offshore regions of the Cascadia subduction zone. The work could contribute to our understanding of slow-slip seismic events and their potential for the generation of large tsunamis. The project will use the Cascadia Initiative?s absolute pressure gauges (APG) data set to develop methods for removing oceanographic noise from the observations to determine what types and time scales can be detected using pressure gauges. Additionally, the project will search for possible vertical deformation that may have occurred during the Cascadia Initiative deployment. The APG records have the potential to detect slow slip events in the accretionary prism, which could change or enhance the understanding of the displacement behavior of these faults and of deformation in the overlying accretionary prism. The results could be applicable to the future data acquired in Cascadia region and elsewhere.Part 2Funds are provided to study the large Cascadia Initiative (CI) absolute pressure gauge (APG) data set that will allow the use of pressure gauges for geodetic observations to monitor deformation in the offshore regions of the Cascadia subduction zone. The utility of APG data for geodetic observations is limited by high noise levels from oceanographic signals and by the inherent drift in the sensors. The proposed research will use this large data set first to develop methods of removing oceanographic noise from these observations so as to determine what types and time scales of vertical deformation can be detected using pressure gauges. The second component of the research will be to search for possible vertical deformation that may have occurred during the CI deployment. The discovery of seismic slow slip events or similar events beneath the seafloor will likely change or enhance our understanding of the displacement behavior of these faults and of deformation in the overlying accretionary prism. This results will be applicable not only to the data acquired in Cascadia, but also to observations from future ocean bottom seismometer deployments with that are equipped with APGs, which also includes a GeoPRISMS focus site, the Hikurangi (New Zealand) subduction margin.

第1部分：拟议的工作将研究使用压力计进行大地测量观测，以监测卡斯卡迪亚俯冲带近海地区的垂直变形。这项工作可能有助于我们了解慢滑地震事件及其产生大海啸的潜力。 该项目将使用卡斯卡迪亚倡议？的绝对压力计（APG）数据集，以开发从观测中去除海洋噪音的方法，以确定使用压力计可以检测到什么类型和时间尺度。此外，该项目还将寻找卡斯卡迪亚倡议部署期间可能发生的垂直变形。APG记录有可能检测到缓慢的滑动事件的增生棱柱，这可能会改变或加强了解这些故障的位移行为和变形的覆盖增生棱柱。 结果可能适用于未来的数据在卡斯卡迪亚地区和elsewhere.Part 2Funds收购提供研究大卡斯卡迪亚倡议（CI）绝对压力计（APG）数据集，将允许使用压力计的大地测量观测，监测变形在卡斯卡迪亚俯冲带的近海地区。由于海洋学信号的高噪音水平和传感器的固有漂移，APG数据用于大地测量观测的效用受到限制。拟议的研究将首先利用这一大型数据集，制定从这些观测中消除海洋噪音的方法，以确定使用压力计可以检测到哪些类型和时间尺度的垂直变形。研究的第二个组成部分将是寻找在CI部署期间可能发生的垂直变形。海底下地震慢滑事件或类似事件的发现可能会改变或加强我们对这些断层的位移行为和上覆增生棱柱体变形的理解。这一结果将不仅适用于在卡斯卡迪亚获得的数据，而且还适用于未来海底地震仪部署的观测，这些地震仪配备了APG，其中还包括GeoPRISMS焦点站点，Hikurangi（新西兰）俯冲边缘。