Collaborative Research: Evolution and hydration of the Juan de Fuca crust and uppermost mantle: a plate-scale seismic investigation from ridge to trench

合作研究：胡安德富卡地壳和上地幔的演化和水化：从洋脊到海沟的板块规模地震调查

• 批准号: 1029411
• 负责人: Suzanne Carbotte
• 金额: $ 59.94万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-03-01 至 2016-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1029411&HistoricalAwards=false
• 关键词: Collaborative; Research; Evolution; hydration; Juan

Subduction is a process in which oceanic crust and upper mantle are consumed beneath the margins of island arcs, such as Japan and Sumatra, or the margins of continents, as along the northwest coast of the U.S. Subducton gives rise to violent volcanic eruptions as well as great ?megathrust? earthquakes and tsunamis. Dramatic demonstrations of the destructive effects of subduction have occurred recently in Indonesia, Japan, and Chile. Water released from the subducted plate is a significant, but poorly understood, contributor to these events; this seismic survey of the Juan de Fuca Plate has the specific aim of characterizing the plate from its formation at the ridge, through alteration and hydration of the plate as it ages, to subduction of the plate along the Cascadia margin. Owing to the very high risk of large earthquakes in Cascadia, improved understanding of the role of water in the subduction process is a primary broader impact of the survey. The project is also an important adjunct to the Cascadia Initiative, a multi-year deployment of instruments both onshore and offshore to study the structure and seismicity of the Cascadia region.

俯冲是一个过程，在这个过程中，海洋地壳和上地幔被消耗在岛弧的边缘之下，如日本和苏门答腊，或大陆的边缘，如沿着美国西北海岸俯冲引起猛烈的火山爆发，以及巨大的？大推力？地震和海啸最近在印度尼西亚、日本和智利发生了俯冲破坏性影响的戏剧性演示。从俯冲板块释放的水是这些事件的一个重要因素，但人们对此知之甚少;对胡安德富卡板块进行的这次地震调查的具体目的是描述该板块从其在脊部的形成，到随着年龄的增长板块的蚀变和水合作用，再到板块沿着卡斯卡迪亚边缘的俯冲。由于卡斯卡迪亚发生大地震的风险很高，因此，更好地了解水在俯冲过程中的作用是这次调查的主要影响。该项目也是卡斯卡迪亚倡议的一个重要补充，卡斯卡迪亚倡议是一项在陆上和海上部署仪器的多年计划，以研究卡斯卡迪亚地区的结构和地震活动。