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

人们已经认识到，断层带是不连续的，断层破裂在物理上可能受到几何不连续性的限制，如断层带中的断层面偏移和弯曲。 本计画旨在评估几何结构在延缓分段逆冲断层动态破裂上的效能。 建议的工作将：1）评估逆冲断层平面偏移在延迟破裂中的有效性，使用新开发的三维有限差分代码能够处理正交的，交叉的故障，以模拟平行逆冲断层段与偏移撕裂断层的相互作用，2）开发和应用有限差分代码来处理逆冲断层段不平行的更一般的情况。 建议的工作的结果将是模型来判断段边界在阻止逆冲断裂的有效性，这将提供一个改进的基础，以评估潜在的未来逆冲地震的规模在洛杉矶盆地。

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.