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级地震调查

• 批准号: 1029305
• 负责人: Juan Pablo Canales
• 金额: $ 37.27万
• 依托单位: Woods Hole Oceanographic Institution
• 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 2015-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1029305&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.

俯冲是洋壳和上地幔在岛弧边缘（如日本和苏门答腊岛）或大陆边缘（如美国西北海岸）下方被消耗的过程。俯冲会引起剧烈的火山喷发以及伟大？巨大推力？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展示。从俯冲板块释放的水是造成这些事件的一个重要因素，但人们对此知之甚少。这项对胡安·德·富卡板块的地震勘测的具体目的是描述板块从其在山脊处的形成、随着板块老化而发生的蚀变和水合作用，直至板块沿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非常高，提高对水在俯冲过程中的作用的了解是这项调查的主要更广泛的影响。该项目也是卡斯卡迪亚计划的重要补充，卡斯卡迪亚计划是一项在陆上和海上部署仪器多年的项目，以研究卡斯卡迪亚地区的结构和地震活动。