3D Inversion for Kinematic Earthquake Source Parameters

该提案的主要重点是通过投资包括三维地球结构的地震波形来确定有限断层上地震破裂过程的运动学。通过将合成地震动与数据进行迭代拟合，推导出断层的破裂过程。格林函数在计算中起关键作用。有限差分法可用于计算复杂的三维土结构的格林函数。将这些三维格林函数包括在有限断层的运动学源参数反演中，是目前确定地震破裂参数方法的自然延伸。为了进一步改进反演，可以使用特殊函数（三次b样条）来离散有限故障上运动参数的空间分布。三维格林函数和三次b样条函数将与一种新开发的非线性反演方法相结合，这种方法对于全局搜索描述破裂所需的运动学参数是必要的。本文将分析加利福尼亚地震、1979年5.9级狼湖地震、1989年7.1级洛马普里塔地震、1994年6.7级北岭地震和1999年7.7级池池地震的资料。

EAR-0073899Archuleta, RalphThe major focus of this proposal is to determine the kinematics of the earthquake rupture process on a finite fault by investing seismic waveforms that include 3D earth structure. The rupture process on the fault is deduced by iteratively fitting the synthetic ground motions to the data. The Green's functions play a critical role in the calculation. Finite difference methods can be used to calculate the Green's functions for a complex, 3D earth structure. Including these 3D Green's functions in inversions for the kinematic source parameters on a finite fault is a natural extension of current methods for determining the parameters of earthquake rupture. To further improve the inversions special functions (cubic B-spline) can be used to discretize the spatial distribution of the kinematic parameters on a finite fault. The 3D Green's functions and the cubic B-spline functions will be combined with a newly developed nonlinear inversion method that is necessary for a global search of the kinematic parameters needed to describe the rupture. Data from the California earthquakes, 1979 M 5.9 Coyote Lake, 1989 M 7.1 Loma Prieta, 1994 M 6.7 Northridge, and the 1999 M 7.7 Chi Chi, Taiwan earthquake will be analyzed.