Margins: Workshop on Modeling of Subduction Zone Dynamics and Thermal Structure

边缘：俯冲带动力学和热结构建模研讨会

• 批准号: 0111459
• 负责人: Peter van Keken
• 金额: $ 2.07万
• 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: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0111459&HistoricalAwards=false
• 关键词: Margins; Workshop; Modeling; Subduction; Zone

Theoretical modeling of subduction zone provides an essential complement to observational and experimental approaches and a fundamental tool to test conceptual models of the dynamics of convergent margins. Despite large advances in numerical techniques and increasing computational capacity, major obstacles exist in the road to full integration of accurate and consistent modeling into subduction zone research. Large uncertainties about the dynamical controls on subduction initiation and evolution remain. This is in part due to important assumptions that have to be made about the rheology and composition of the slab and mantle wedge, and the dynamics of the seismogenic zone and overriding plate. In addition, we lack a systematic investigation into the influence of various numerical techniques or rigorous solution tests. An overview of recently published results shows that large discrepancies remain in our understanding of the thermal structure of subduction zones. Major tasks for the modeling community are to benchmark and evaluate existing numerical approaches, to guide the use of increasing computer power and improving numerical techniques, and to further the integration of numerical modeling into experimental and observational studies. A focused, technical workshop held at the University of Michigan in Ann Arbor, MI addresses these issues. The workshop format is collaborative and hands-on, with an audience consisting of subduction zone modelers, experts from observational and experimental disciplines, and a number of graduate students.To maximize discussion, the workshop is limited to 25 participants and has limited time allocated to formal presentations. The goals of the workshop include:1) a numerical benchmark of standard cases;2) an overview of technical improvements and limitations;3) a survey of the parameters that are fundamental in controlling the dynamics of the slab-wedge environment;4) a set of base models for use in the wider community;5) information exchange and knowledge transfer between specialties;6) increased collaboration, including code and resource sharing.

俯冲带的理论建模是对观测和实验方法的重要补充，也是检验收敛边缘动力学概念模型的基本工具。尽管数值技术取得了巨大进步，计算能力也在不断提高，但在将精确和一致的建模完全整合到俯冲带研究中还存在主要障碍。关于俯冲开始和演化的动力学控制仍然存在很大的不确定性。这在一定程度上是由于必须对板块和地幔楔的流变学和组成，以及发震带和上覆板块的动力学做出重要假设。此外，我们缺乏对各种数值技术或严格的解测试的影响的系统调查。对最近发表的结果的概述表明，我们对俯冲带热结构的理解仍然存在很大的差异。模拟界的主要任务是对现有的数值方法进行基准测试和评估，指导使用日益增强的计算机能力和改进的数值技术，并进一步将数值模拟整合到实验和观测研究中。在密歇根州安娜堡的密歇根大学举行的一个重点技术研讨会解决了这些问题。研讨会的形式是协作和动手，观众包括俯冲带建模者，来自观察和实验学科的专家，以及一些研究生。为了最大限度地扩大讨论，研讨会的参与者限制在25人，并且分配给正式演讲的时间有限。研讨会的目标包括：1)标准案例的数值基准；2)技术改进和限制的概述；3)对控制板楔环境动力学的基本参数进行概述；4)一套供更广泛社区使用的基本模型；5)专业间的信息交流和知识转移；6)增加协作，包括代码和资源共享。