Thermal structure, hydration and dehydration of the entire Juan de Fuca Plate

整个胡安德富卡板块的热结构、水化和脱水

• 批准号: 1334831
• 负责人: James Gaherty
• 金额: $ 21.05万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-01 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1334831&HistoricalAwards=false
• 关键词: Thermal; structure; hydration; dehydration; entire

Seismic data recorded by the Cascadia Initiative array will be analyzed to look at evolution of the ocean lithosphere from ridge to trench on the Juan de Fuca plate. The determined structure will be related to along-strike variation in down-going plate properties (apparent hydration and whether it occurs in the young and/or older plate, thermal structure, segmentation) and seismic behavior along Cascadia subduction zone. Shear wave structure will be determined from surface waves and ambient noise analysis; receiver functions will indicate the depth distribution of interfaces between contrasting properties. Surface wave results will provide the starting model for the receiver function analysis, which will also use results from the COAST study that documented crustal velocity.A graduate student will receive training in seismic analysis and Cascadia processes. A portion of the results will provide context for hazard assessment of the margin, in particular along-strike variability. In-depth use of the CI community experiment data will take place and the results of this study is expected underpin a variety of subsequent geoscience investigations.

将对卡斯卡迪亚倡议阵列记录的地震数据进行分析，以研究胡安德富卡板块从山脊到海沟的海洋岩石圈演化。确定的构造将与沿卡斯卡迪亚俯冲带的下行板块性质(表观水化作用及其是否发生在年轻和/或较老的板块、热结构、分段)和地震行为的沿走向变化有关。横波结构将从面波和环境噪声分析中确定；接收器函数将指示对比属性之间界面的深度分布。面波结果将为接收函数分析提供起始模型，该分析还将使用记录地壳速度的海岸研究结果。研究生将接受地震分析和卡斯卡迪亚过程方面的培训。部分结果将为边缘的危险评估提供背景，特别是沿走向的可变性。将深入使用CI社区实验数据，预计这项研究的结果将为随后的各种地球科学调查奠定基础。