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，以监测卡斯卡迪亚俯冲带近海区域的垂直变形。这项工作可能有助于我们了解慢滑地震事件及其产生大型海啸的可能性。 该项目将使用卡斯卡迪亚计划的绝对压力计（APG）数据集来开发从观测中消除海洋噪声的方法，以确定使用压力计可以检测到哪些类型和时间尺度。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记录有可能探测到增生棱柱中的慢滑移事件，这可能会改变或增强对这些断层的位移行为以及上覆增生棱柱变形的理解。 结果可适用于未来在卡斯卡迪亚地区和其他地方获取的数据。第 2 部分提供资金用于研究大型卡斯卡迪亚倡议 (CI) 绝对压力计 (APG) 数据集，该数据集将允许使用压力计进行大地测量观测来监测卡斯卡迪亚俯冲带近海区域的变形。 APG 数据在大地测量中的应用受到海洋信号高噪声水平和传感器固有漂移的限制。拟议的研究将首先使用这个大数据集来开发从这些观测中消除海洋噪声的方法，以确定可以使用压力计检测到哪些类型和时间尺度的垂直变形。研究的第二个部分是寻找 CI 部署期间可能发生的垂直变形。海底以下地震慢滑事件或类似事件的发现可能会改变或增强我们对这些断层的位移行为以及上覆增生棱柱变形的理解。该结果不仅适用于在卡斯卡迪亚获取的数据，还适用于未来配备 APG 的海底地震仪部署的观测，其中还包括 GeoPRISMS 焦点站点，即 Hikurangi（新西兰）俯冲边缘。