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

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形变。这项工作有助于我们理解慢滑地震事件及其引发大海啸的可能性。该项目将使用卡斯卡迪亚倡议？S绝对压力计的数据集来开发从观测中去除海洋噪声的方法，以确定使用压力计可以检测到哪些类型和时间尺度。此外，该项目将寻找在卡斯卡迪亚倡议部署期间可能发生的垂直变形。APG记录有可能探测到吸积棱柱中的慢滑事件，这可能会改变或加强对这些断层的位移行为和上覆吸积棱柱中变形的了解。这一结果可能适用于卡斯卡迪亚地区和其他地区未来获得的数据。第2部分提供了研究卡斯卡迪亚倡议(CI)绝对压力计(APG)大型数据集的基础，该数据集将允许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区域的变形。由于海洋信号的高噪声水平和传感器的固有漂移，APG数据在大地测量中的应用受到限制。拟议的研究将首先使用这一大型数据集来开发从这些观测中去除海洋噪声的方法，以便确定使用压力计可以检测到哪些类型和时间尺度的垂直形变。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。海底以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吸积棱柱变形的理解。这一结果将不仅适用于在卡斯卡迪亚获得的数据，而且也适用于未来海底地震仪部署的观测，其中还包括地球空间信息系统的一个重点地点--Hikurangi(新西兰)俯冲边缘。

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.