3-D Finite Difference Simulations of Multi-Segment Thrust Rupture

[903099]人们已经认识到，断裂带是不连续的，断层破裂在物理上可能受到断裂带中几何不连续的限制，例如断层面偏移和弯曲。本项目旨在评价几何构造在分段逆冲断层上延缓动态破裂的有效性。提出的工作将：1)利用新开发的三维有限差分代码来评估逆冲断层面偏移在延缓破裂中的有效性，该代码能够处理正交相交断层，以模拟平行逆冲断层段与偏移撕裂断层的相互作用；2)开发并应用有限差分代码来处理逆冲断层段不平行的更一般情况。这项工作的结果将成为判断分段边界在阻止逆冲破裂方面有效性的模型，这将为评估洛杉矶盆地未来潜在逆冲地震的规模提供改进的依据。

9903099MagistraleIt has been recognized that fault zones are discontinuous, and that fault rupture may be physically bounded in extent by geometric discontinuities, such as fault-plane offsets and bends, in the fault zone. This project is to evaluate the effectiveness of geometrical structures in retarding dynamic rupture on segmented thrust faults. The proposed work will:1) Evaluate the effectiveness of thrust fault-plane offsets in retarding rupture, using a newly developed three-dimensional finite difference code capable of handling orthogonal, intersecting faults to model the interaction of parallel thrust fault segments with an offsetting tear fault,2)Develop and apply a finite difference code to handle more general cases where the thrust fault segments are not parallel. The results of the proposed work will be models to judge the effectiveness of segment boundaries in stopping thrust rupture, which will provide an improved basis from which to assess the size of potential future thrust earthquakes in the Los Angeles basin.