关于有限断层计算模型的研究——考虑位错时、空不均匀分布的滑动时间函数

Study on Finite Fault Model for Calculation--Considering Slip-Time Function of Heterogeneous Displacement Distribution in Temporal and Spatial Domain

摘要:

断层面上某一点的滑动时间函数需要用三个参数来表达:断层的平均位错量、上升时间和破裂传播的时间延迟.本文基于有限断层模型,根据断层面上每个子源的位错量时、空不均匀分布特征,采用Brune模型系统确定了相应滑动时间函数的三个参数,构建了位错量呈时、空不均匀分布的有限断层滑动模型.该方法可以表现破裂面上断层位错量在时间和空间上分布的不均匀特征,既能够表现震源的复杂性同时又能够简化震源模型的构建过程,为考虑断层附近的强地震动数值模拟计算提供了有效的途径.

Abstract:

For a point on fault,the slip-time function can be described by three parameters,the average displacement,rising time and time delay of wave propagation. In this paper, based on finite fault model,according to heterogeneons displacement distribution in temporal and spatial of the sub-source,the parameters of slip-time function are determined and the finit fault model with uniform displacements is presented. The method not only described the complexity of earthquake source but also simplified the finite fault model, which provided an effective input for numerical simulation of near-field strong ground motion.