Evolution of the San Andreas Fault System from the lithospheric-scale 3-D thermo-mechanical modelling constrained by geophysical observations

本项目旨在研究近20年来加利福尼亚州圣安德烈亚斯断层系统（SAFS）岩石圈尺度变形过程中控制应力分布以及应变局部化和分配的因素。为了实现这一目标，我们将采用完全内部一致的三维热机械有限元模型，并将使用岩石圈结构、应力场测量、GPS数据和其他地球物理（例如热流）和地质观测数据作为建模约束。特别是，正在加利福尼亚州帕克菲尔德进行的SAFOD钻井项目的结果将为建模提供关于临界边界条件的重要信息。简化的3-D数值技术（所谓的2½-D技术）最近在GFZ开发并成功应用于死海变换和SAFS的建模，将扩展到包括沿走向的结构和位移变化。

The aim of this project is to study factors controlling distribution of stress as well as localization and partitioning of strain during lithosphere-scale deformation at the San Andreas Fault System (SAFS) in California during the last 20 My. To accomplish this we will employ a fully internally consistent thermo-mechanical finite-element modelling in 3-D, and will use information on lithospheric structure, stress-field measurements, GPS data and other geophysical (e.g. heat flow) and geological observations as modelling constraints. In particular, the results of the ongoing SAFOD drilling project in Parkfield, California, will provide important information about critical boundary conditions for the modelling. The simplified 3-D numerical technique (so-called 2 ½-D technique), which was recently developed at the GFZ and successfully applied to the modelling of the Dead Sea Transform and SAFS, will be extended to include along-strike variations of structure and displacements.