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.

Cascadia Initiative阵列记录的地震数据将进行分析，以查看海洋岩石圈从Juan de Fuca板上从山脊到沟渠的演变。确定的结构将与下部板块特性的沿形变化有关（明显的水合及其是否发生在年轻和/或旧板中，热结构，分割）和沿卡斯卡迪亚俯冲带沿线的地震行为。剪切波结构将根据表面波和环境噪声分析确定；接收器功能将指示对比属性之间接口的深度分布。表面波结果将为接收器功能分析提供起始模型，该模型还将使用海岸研究的结果，该研究记录了地壳速度。研究生将接受地震分析和Cascadia过程的培训。结果的一部分将为边缘的危害评估提供背景，尤其是局势可变性。将进行CI社区实验数据的深入使用，预计这项研究的结果将支持各种随后的地球科学研究。