The Long-Term Dynamics and Evolution of Dip-Slip Faults

提案EAR0106828（PH #31 x）摘要标题：倾滑断层的长期动力学和演化PI：奥格尔斯比，大卫D.，本项目的目标是研究多个地震对倾滑断层动力学的影响。倾滑地震的观测和模型表明，非垂直断层的行为方式与垂直走滑断层有很大不同。特别是，这些故障显示较高的运动上盘，显着的变化，在方向上的滑动沿着走向，和更大的运动的逆冲事件比其他等效的正常事件。该项目将有助于确定这些和其他影响是否在多个地震周期中持续存在。此外，研究人员将调查（在合理的物理假设下）倾滑断层是否会随着时间的推移达到稳定状态，或者应力和滑动的复杂性是否会增加。最后，研究人员将分析断层的长期演化对近源地面运动的影响。该项目将结合使用有限元法和变分边界积分法，模拟断裂和滑动过程的动态以及地震间隔期间的加载和成核。这些结果将对地震过程的基本物理学和地震危险性产生影响。

Abstract for proposal EAR0106828 (PH #31x)Title: The Long-Term Dynamics and Evolution of Dip-Slip FaultsPI's: Oglesby, David D., and Xu, Guanshui, University of California, RiversideThe goal of this project is to investigate the effects of multiple earthquakes on the dynamics of dip-slip faults. Observations and models of dip-slip earthquakes have shown that non-vertical faults behave in ways that are quite different from vertical strike-slip faults. In particular, these faults display higher motion on the hanging wall, marked changes in the direction of slip along strike, and greater motion for thrust events than for otherwise equivalent normal events. This project will help determine if these and other effects persist over multiple earthquake cycles. Additionally, the researchers will investigate whether (under reasonable physical assumptions) dip-slip faults will reach a steady state over time, or if complexity in stress and slip will grow. Finally, the researchers will analyze the effect that the long-term evolution of the fault has on near-source ground motion. The project will use a combination of the finite element and variational boundary integral methods to model the dynamics of the rupture and slip process, as well as loading and nucleation during the interseismic period. The results will have implications for both the basic physics of the earthquake process as well as seismic hazard.