Bathymetric Survey: Completion of Coverage of the Cascadia Subduction Zone in Support of the Cascadia Initiative OBS Array Deployment

水深测量：完成卡斯卡迪亚俯冲带的覆盖，支持卡斯卡迪亚计划 OBS 阵列部署

• 批准号: 1137986
• 负责人: Chris Goldfinger
• 金额: $ 16.99万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2014-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1137986&HistoricalAwards=false
• 关键词: Bathymetric; Survey; Completion; Coverage; Cascadia

As part of the 2009 ARRA (American Recovery and Reinvestment Act) spending, NSF?s Earth Sciences (EAR) and Ocean Sciences (OCE) divisions each received $5M in facility-related investment. The funds were targeted toward the creation of an Amphibious Array Facility to support EarthScope and MARGINS science objectives. The first of these studies will take place in Cascadia (offshore northern California, Oregon, Washington and southern British Columbia), where there is significant risk of a major subduction zone, ?megathrust? earthquake that will affect population centers including Vancouver, Seattle and Portland. With the primary aim of improving our understanding of seismicity and seismic risk in this region, 60 or more Ocean Bottom Seismographs (OBS) will be deployed across the region over a period of four years beginning in the summer of 2011. The recent earthquake and tsunami in northern Japan, a setting not unlike Cascadia, provide fresh impetus for this study. Good bathymetric data are essential for choosing OBS station locations. Because many of the deployments occur in and near active canyon systems and very seismically active areas, site selection will be difficult, and good bathymetric data are required to minimize the loss of instruments. The proposed cruise will fill in poor bathymetric coverage in Cascadia, particularly along the Washington and Canadian margins. In addition to its obvious contribution to the overall objective of the Cascadia Initiative, broader impacts of this effort include improvements in regional bathymetric coverage that will significantly improve our understanding of the Cascadia subduction margin, and have implications for seismic hazards in the western U.S. Additionally, the project will provide training and support for a graduate student.

作为2009年ARRA（美国复苏和再投资法案）支出的一部分，NSF？公司的地球科学（ESTA）和海洋科学（OCE）部门分别获得了500万美元的设施相关投资。这些资金用于建立一个两栖阵列设施，以支持EarthScope和MARGINS的科学目标。第一项研究将在卡斯卡迪亚（近海北方加州、俄勒冈州、华盛顿和不列颠哥伦比亚省南部）进行，那里存在重大俯冲带的风险。大推力？这次地震将影响包括温哥华、西雅图和波特兰在内的人口中心。主要目的是提高我们对该地区地震活动和地震风险的认识，从2011年夏天开始，在四年内将在该地区部署60个或更多的海底地震仪。最近发生在日本北方的地震和海啸为这项研究提供了新的动力。良好的测深数据对于选择OBS台站位置至关重要。由于许多部署发生在活跃的峡谷系统和地震非常活跃的地区内或附近，因此选址将很困难，需要良好的测深数据，以尽量减少仪器的损失。拟议的巡航将填补卡斯卡迪亚，特别是沿着华盛顿和加拿大边缘的水深覆盖面差。除了对卡斯卡迪亚倡议总体目标的明显贡献外，这一努力的更广泛影响包括区域测深覆盖范围的改善，这将大大提高我们对卡斯卡迪亚俯冲边缘的理解，并对美国西部的地震危险产生影响。