Large-Scale Computation for Seismic Applications

地震应用的大规模计算

• 批准号: 8922865
• 负责人: Richard Ewing
• 金额: $ 10万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922865&HistoricalAwards=false
• 关键词: Large; Scale; Computation; Seismic; Applications

This research project focuses on the development of improved techniques for solving the acoustic and elastic wave equations. The work has applications to seismic exploration, nondestructive testing, sonar interpretation, and other fields. The immediate aim is to enhance numerical methods for the so-called forward problem, in which initial-boundary data and material properties are assumed known. However, the research has the ultimate objective of using accurate forward solvers in an iterative fashion to attack the inverse problem, in which one seeks estimates of material properties (wave velocities) given observed responses of the medium to seismic waves. The project represents a continuation of earlier research at Wyoming, in which codes were developed for solving the acoustic and elastic wave equations in three space dimensions. The project addresses several numerical approaches. Among these are the representation of interfaces between strata having different wave velocities, the construction of spatial grids that will yield accurate discretizations in highly heterogeneous media, the design of efficient time-stepping schemes and associated numerical linear algebra, and the adaptation of numerical procedures to parallel- and vector architecture machines. Another important element of the project is the continued development of object-oriented graphics software to aid in the visualization of large-scale model results.

该研究项目的重点是开发解决声波和弹性波方程的改进技术。 该工作应用于地震勘探、无损检测、声纳解释等领域。 直接目标是增强所谓的正向问题的数值方法，其中假设初始边界数据和材料属性已知。 然而，该研究的最终目标是以迭代方式使用精确的正向求解器来解决逆问题，即在给定观测到的介质对地震波的响应的情况下寻求对材料特性（波速）的估计。 该项目是怀俄明州早期研究的延续，其中开发了用于求解三个空间维度中的声波和弹性波方程的代码。 该项目涉及几种数值方法。 其中包括具有不同波速的地层之间界面的表示、在高度异质介质中产生精确离散化的空间网格的构建、有效时间步进方案和相关数值线性代数的设计，以及数值程序对并行和矢量架构机的适应。 该项目的另一个重要组成部分是继续开发面向对象的图形软件，以帮助大规模模型结果的可视化。