摘要
从速度-应力弹性波动方程出发,利用基于快速傅立叶变换的伪谱法对地质模型进行波场模拟,旨在提高模拟的速度和精度.相应的方法可用于均匀介质和不均匀介质中地震波传播的模拟.模拟结果表明,伪谱法是一种有效的地震波数值模拟方法:易于实现,计算速度快、计算效率高,其计算速度是有限差分方法的数倍,能有效克服数值频散.
Traditional seismic wave forward modeling methods are finite element method and finite difference method. The former needs enormous computation resources, with a very slow computation speed. The latter with simple arithmetic, yet cannot overcome numerical diffusion of the frequency efficiently. The velocity-stress pseudospectral method, an efficiently numerical modeling method, is easy to implement, with a high computation efficiency and can overcome numerical diffusion of the frequency efficiently. The method developed can work for forward modeling of seismic waves propagating in both homogeneous and heterogeneous layered media. Based on the velocity-stress wave equation, the corresponding method can be used to simulate wave propagation in both homogeneous and heterogeneous media. Results show that pseudospectral method is an effective method for seismic wave modeling.
出处
《桂林工学院学报》
北大核心
2007年第2期178-181,共4页
Journal of Guilin University of Technology
基金
国家杰出青年科学基金项目(40025412)
中国科学院"百人计划"项目(10010120)
中国科学院知识创新工程重大项目(KZCX-07)
国家自然科学基金资助项目(40304004)
关键词
伪谱法
地震波
传播
数值模拟
pseudospectral method
seismic wave
propagation
numerical modeling
