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

俯冲是海洋地壳和上地幔在岛弧边缘（如日本和苏门答腊）或大陆边缘（如美国西北海岸）下被消耗的过程。俯冲引起剧烈的火山爆发和巨大的逆冲作用。地震和海啸。最近在印度尼西亚、日本和智利发生了俯冲的破坏性影响的戏剧性的证明。从俯冲板块释放的水是这些事件的重要因素，但人们对其知之甚少；这次对胡安·德·富卡板块的地震调查的具体目的是描述板块的特征，从它在山脊的形成，到随着年龄的增长，板块的蚀变和水化作用，再到板块沿卡斯卡迪亚边缘的俯冲。由于卡斯卡迪亚地区发生大地震的风险非常高，因此提高对水在俯冲过程中的作用的认识是此次调查的主要影响。该项目也是Cascadia倡议的重要补充，Cascadia倡议是一项为期多年的陆上和海上仪器部署，用于研究Cascadia地区的结构和地震活动。

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.