【摘要】 准各向同性(QI)近似可用于弱各向异性介质的正演模拟.本文通过运用QI方法的零阶和一阶近似,计算了VTI介质模型的地震记录.得出的地震记录与标准各向同性射线理论(IRT)和基于伪谱法的三维地震正演模拟得出的地震记录作了比较,可以认为是精确的合成地震记录.更多还原

【Abstract】 The quasi-isotropic(QI) approximation allows to perform modeling in weakly anisotropic medium.Seismograms for VTI medium are calculated using the zeroth-and first-order QI approximation.These seismograms are compared with seismograms computed by the standard isotropic ray theory(IRT) and by a 3D seismic forward modeling algorithm which is based on a pseudo-spectral method.The seismograms obtained by the quasi-isotropic(QI) approximation are considered as exact seismograms.更多还原