ITR: Development of an Integrated Tool for Modeling Quasi-static Deformation in the Solid Earth

该项目为解决地球物理中的准静态问题提供了一个完整的建模环境。我们的目标是提供一种易于使用、开源并且能够解决各种规模的问题的工具，包括目前无法解决的大规模问题。通过这一工具，用户能够在从几天(例如大地震后的震后松弛、活火山下方的岩浆室扩张/收缩)、到数年(例如用于评估地震危险性的地震间应力/应变累积模型)、到数百年或数千年(例如活动地震带的多地震模拟)到数百万年(例如构造特征的演化)的时间尺度上处理问题。通过将代码整合到加州理工学院正在开发的PYRE框架中，帮助实现了易用性。通过使用此框架，用户可以自动访问已包含在PYRE中的其他工具，包括耦合不同代码的能力。PYRE框架的使用还极大地降低了创建模型、探索参数空间和可视化结果的复杂性。还提供了全面的文档和一套测试问题，作为新用户的起点，使他们能够快速开发自己的模型。这个项目的核心是有限元程序Tecton的一个版本，它是专门为解决构造问题而设计的。除了将代码合并到PYRE框架中之外，还使用PETSC并行库对代码进行了并行化。并行实现将允许在广泛的计算机体系结构上使用代码，包括串行(单处理器)机器、共享存储器(多处理器)机器、PC或工作站网络或专门设计的工作站集群。因此，根据可用的计算资源，用户将能够解决各种规模的问题

This project is providing a complete modeling environment for solving quasi-static problems in geophysics. The goal is to provide a tool that is easy to use, open-source, and able to solve problems of all scales, including large-scale problems that are not presently solvable. With this tool, users are able to address problems on time scales ranging from days (e.g., postseismic relaxation following a large earthquake, magma chamber expansion/contraction beneath an active volcano), to years (e.g., models of interseismic stress/strain accumulation to evaluate seismic hazard), to hundreds or thousands of years (e.g., multi-earthquake simulations of an active seismic zone), to millions of years (e.g., evolution of tectonic features). Ease of use is aided by incorporating the code into the Pyre framework being developed at Caltech. By using this framework, users automatically gain access to other tools already included in Pyre, including the ability to couple different codes. Use of the Pyre framework also greatly reduces the complexity of creating a model, exploring parameter space, and visualizing the results. Comprehensive documentation and a suite of test problems are also being provided as a starting point for new users, allowing them to rapidly develop their own models. The core of this project is a version of the finite element code TECTON, which has been specifically designed to solve tectonic problems. In addition to incorporating the code into the Pyre framework, the code is also being parallelized using the PETSc parallel libraries. The parallel implementation will allow the code to be used on a wide range of computer architectures, including serial (single processor) machines, shared memory (multiprocessor) machines, networks of PC's or workstations, or specially-designed workstation clusters. Thus, users will be able to solve problems of all scales, depending on the available computational resources