3D Inversion for Kinematic Earthquake Source Parameters

这项提议的主要焦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。通过迭代拟合合成地震动值来推断断层的破裂过程。格林函数在计算中起着至关重要的作用。有限差分方法可以用来计算复杂的三维地球结构的格林函数。将这些三维格林函数包含在有限断层运动源参数的反演中，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-样条法)离散有限断层上运动参数的空间分布。三维格林函数和三次B-样条函数将与新开发的非线性反演方法相结合，这是描述破裂所需的运动学参数的全局搜索所必需的。文中将分析1979年加州郊狼湖5.9级地震、1994年北岭6.7级7.1级洛马普列塔地震和1999年台湾集集7.7级地震的资料。

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.