Three Dimensional Models of Flow and Deformation in Subduction Zones

俯冲带流动和变形的三维模型

• 批准号: 8708477
• 负责人: Richard O'Connell
• 金额: $ 8.12万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1991-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8708477&HistoricalAwards=false
• 关键词: Three; Dimensional; Models; Flow; Deformation

The PI will construct detailed three dimensional models of flow in subduction zone for comparison with seismic determi- nations of the flow, deformation and stress in subducted litho- spheric slabs. Adequate resolution will be obtained by solving for 3D flow in a limited region around the subduction zone (a few thousand kilometers) and superposing this small scale solution on the large scale flow resulting from global plate motions and large scale convection. Flow driven by tomograph- ically inferred density anomalies will be included. The analysis of the models will trace the flow of subducted material, deter- mine stress and deformation associated with deeep seismicity, and constrain mantle viscosity and structure. The models will allow a quantitative understanding of the dynamics and mechanics of subduction processes.

PI将构建详细的三维模型， 俯冲带中的流动与地震测定的比较 俯冲岩石的流动、变形和应力状态， 球形板 适当的分辨率将通过求解 对于俯冲带（a）周围有限区域内的三维流动， 几千公里）， 全球板块引起的大尺度流动的一个解 运动和大尺度对流。 断层扫描仪驱动的血流- 将包括推断的密度异常。 分析 的模型将跟踪俯冲物质的流动，阻止- 与深部地震活动有关的矿山应力和变形， 制约地幔的粘度和结构。 模特们将 使我们能够定量地了解 俯冲过程。