ITR/AP: Simulation of Multi-Scale Deformation in Solid Earth Geophysics

[2056553]古尼斯：这是一个开发一套工具来模拟地球科学问题的多尺度变形的项目。这项工作的动机是需要了解板块构造的长期演化和短期过程（如地震期间和地震之间的断层演化）之间的相互作用。地球科学界的几个主要数据采集工作正在进行中或处于高级规划阶段（EarthScope包括PBO -板块边界天文台，InSAR -基于卫星的干涉合成孔径雷达，USArray - 400单元可移动地震阵列，GPS -连续全球定位系统测量）。这些观测项目将迅速产生大量高质量的数据集，记录地球表面在多个时间尺度上的变形，从同震和震后到长期构造时间尺度，以及从厘米到数千公里的多个空间尺度。主要研究人员将制作一个建模包，供整个地球科学界使用，它解决了当前可行的局限性，并且作为设计需求与软件进化和增长一起进行工程设计。他们的努力将扩展PYRE框架的功能，PYRE框架是一个面向对象的环境，能够在多个平台上指定和启动数值模拟，包括可以与网格计算系统一起工作的Beowulf类并行计算机。具体来说，社区需要灵活的建模工具，包括复杂的流变学，例如，温度依赖，非牛顿，粘弹塑性与离散的破坏面和动态重网格，以解决高应变的演变区域。从计算的角度来看，这是实现这些目标的绝佳时机。PC行业的重大进步使科学家们能够以合理的计算成本和金钱成本建造大规模并行PC集群计算机，从而实现逼真的3d模拟。与这些硬件进步相辅相成的是主要的架构解决方案，它允许将更多传统代码绑定在一起，以解决复杂的、多尺度的、多物理场的问题。这将是加州理工学院两个单位之间的合作项目；高级计算机研究中心（CACR）和地震实验室。在项目进行大约18个月后，该软件的测试版将提供给社区，最终版本将不受限制地提供，例如安装在NSF PACI计算设备上。新的地球动力学建模框架将很容易地允许人们在从单处理器到TerraGrid的各种平台上启动2d和3d模拟，使代码对广泛的用户有用，从个人科学家和教育工作者到跨学科团队，在EarthScope内进行最先进的计算

0205653GurnisThis is a project to develop a suite of tools to model multi-scale deformation for Earth Science problems. This effort is motivated by the need to understand interctions between the long-term evolution of plate tectonics and shorter term processes such as the evolution of faults during and between earthquakes. Several major data acquisition efforts within the Earth Sciences community are underway or at an advanced planning stage (EarthScope including PBO - Plate Boundary Observatory, InSAR - Satellite based Interferometric Synthetic Aperture Radar, USArray - a 400 element moveable seismic array, GPS - continuous Global Positioning System measurements). These observational programs will rapidly produce vast, high-quality data sets which record deformation of the Earth's surface on multiple time scales, from co-seismic and post-seismic to long term tectonic time scales, and on multiple spatial scales, from centimeters to thousands of kilometers.The Principal Investigators will produce a modeling package, usable by the entire Earth sciences community, that addresses the limitations of what is currently feasible and that is engineered with software evolution and growth as design requirements. Their efforts will extend the capabilities of the PYRE framework, an object-oriented environment capable of specifying and launching numerical simulations on multiple platforms, including Beowulf class parallel computers, that can function with grid-computing systems. Specifically, the community needs fexible modeling tools that incorporate complex rheologies, e.g., temperature-dependent, non-Newtonian, visco-elasto-plasticity with discrete failure planes and dynamic re-gridding to resolve evolving regions of high strain. From a computational perspective, this is an excellent time to pursue these objectives. Major advances in the PC industry enable scientists to build massively parallel PC cluster computers that facilitate realistic 3-D simulations at reasonable computational and monetary costs. Complimenting these hardware advances are major architectural solutions allowing more traditional codes to be bound together to solve complex, multi-scale, multi-physics problems.This will be a collaborative project between two Caltech units; The Center for Advanced Computer Research (CACR) and the Seismological Laboratory. After about eighteen months into the project, beta versions of the software will be made available to the community and final versions will be available without restrictions, installed on NSF PACI computing facilities, for example. The new geodynamics modeling framework will easily allow one to launch 2-D AND 3-D simulations on platforms ranging in scale from uniprocessors to the TerraGrid, making the code useful to a wide range of users from individual scientists and educators to inter disciplinary teams working on state of the art calculations posed within EarthScope.***