Collaborative Research: 3D modeling of subduction in the Pacific

合作研究：太平洋俯冲的 3D 建模

• 批准号: 0646757
• 负责人: Peter van Keken
• 金额: $ 9.71万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0646757&HistoricalAwards=false
• 关键词: Collaborative; Research; 3D; modeling; subduction

The PIs will use the fully parallel Sepran finite element code to generate high resolution 3D models of subduction zones that can be used to overcome the limitations of 2D models. The 3D approach will allow them to investigate the influence of along-strike variations in slab parameters such as slab-dip, age of incoming lithosphere, direction and speed of convergence, and lateral variations in properties of the overriding plate. This approach will also allow them to quantify the influence of along-strike wedge flow, which is likely to occur near slab edges or can be generated when pressure gradients in the overlying wedge are induced by lateral variations in the subduction zone geometry. This collaborative effort will constrain the model geometry by the best available local observations from seismology and plate kinematics. They will test the models using seismological observations of wedge velocity and anisotropy structure. The main scientific goals to be accomplished are: 1) the application of the 3D models to a selected number of present-day subduction zones with significant along-strike variations in slab input or observables; 2) an investigation of the influence of arc-parallel flow on mantle wedge conditions near the edges of subduction zones.The potential broader impacts of this project involve the training of three graduate students will be trained as a part of this effort, at Michigan, Brown and Boston University.

PI 将使用完全并行的 Sepran 有限元代码生成俯冲带的高分辨率 3D 模型，该模型可用于克服 2D 模型的局限性。 3D 方法将使他们能够研究板片参数沿走向变化的影响，例如板片倾角、进入岩石圈的年龄、收敛的方向和速度以及覆盖板块特性的横向变化。这种方法还将使他们能够量化沿走向楔形流的影响，这种影响可能发生在板片边缘附近，或者当俯冲带几何形状的横向变化引起上覆楔形中的压力梯度时可能产生。这项合作将通过地震学和板块运动学的最佳可用局部观测来限制模型几何形状。他们将使用楔形速度和各向异性结构的地震观测来测试模型。要实现的主要科学目标是：1）将 3D 模型应用于选定数量的当今俯冲带，这些俯冲带的板片输入或可观测值具有显着的沿走向变化； 2）调查弧平行流对俯冲带边缘附近地幔楔条件的影响。该项目的潜在更广泛影响包括培训三名研究生，作为这项工作的一部分，将在密歇根州接受培训，布朗大学和波士顿大学。