Developing Comprehensive Three-Dimensional Fault Models and Simulating Seismic Wave Propagation Generated by These Earthquake Sources

摘要EAR0087648（PH#31x）提案标题：开发综合三维断层模型并模拟这些震源产生的地震波传播。Shaw，哈佛大学本项目旨在开发洛杉矶盆地活动断层系统的三维结构模型，以研究地震行为。这些模型将纳入石油工业获得的大量以前专有的地下地球物理数据，包括地震反射剖面和测井记录。这些数据与地震活动性相结合，将确定断层在深度上的位置和几何形状。这些模型将包括走滑断层系统和盲冲断层系统，这两种断层系统都能够产生破坏性地震。大地测量观测（GPS和干涉合成孔径雷达）将与断层位移进行比较，以评估模拟断层形状和滑动速率的准确性。新的模型将被用来检查在洛杉矶断层系统的机械相互作用，包括应力触发现象。这种行为表明，一个断层上的大地震可以引发邻近断层的事件，从而增加地震危险性。最后，该模型将被用来模拟地震波传播从现实的，三维断层源预测危险的地面震动。这些类型的模拟结果有助于改进地震工程，从而有助于减轻这些自然灾害。

Abstract for proposal EAR0087648 (PH # 31x)Title: Developing comprehensive three-dimensional fault models and simulatingseismic wave propagation generated by these earthquake sources PI's: John H. Shaw, Harvard UniversityThis project aims to develop three-dimensional structural models of active fault systems in the Los Angeles basin to study earthquake behavior. The models will incorporate large amounts of formerly proprietary subsurface geophysical data, including seismic reflection profiles and well logs, that were acquired by the petroleum industry. These data, combined with earthquake seismicity, will define the positions and geometries of faults at depth. The models will include both strike-slip and blind-thrust fault systems, both of which are capable of generating destructive earthquakes. Geodetic observations (GPS and InSAR) will be compared with fault displacements to assess the accuracy of modeled fault shapes and slip rates. The new models will be used to examine the mechanical interactions of fault systems in Los Angeles including stress-triggering phenomena. This behavior suggests that major earthquakes on one fault can induce events on adjacent faults, thereby increasing seismic hazard. Finally, the model will be used to simulate earthquake wave propagation from realistic, three-dimensional fault sources for the prediction of hazardous ground shaking. Results from these types of simulations can contribute to improved earthquake engineering, thereby helping to mitigate these natural disasters.