【摘要】 从具有倾斜对称轴的横向各向同性介质(TTI)中的弹性波动方程出发,在交错网格空间中采用高阶差分算子对弹性波方程进行差分离散,得到了TTI介质中地震波正演的高阶有限差分格式.研究了PML吸收边界条件,推导了该边界条件在交错网格中的高阶差分格式,在此基础上实现了二维TTI介质中弹性波方程正演的多波正演.数值算例表明:该方法能够精确模拟弹性波在复杂各向异性介质中的传播过程,得到高精度的正演记录.更多还原

【Abstract】 From the elastic wave equations in transversely isotropic medium with a tilted symmetry,a high-order finite difference scheme was established using a high precision operator in staggered-grid.Proposed an perfectly matched absorbing layer(PML) boundary conditions and studied its computing methods.Based on above two techniques,the forward modeling of seismic wave fields in complex anisotropic media was implemented.The numerical tests show that the method can simulate the seismic propagation accurately and can obtain high precision multi-component seismograms.更多还原