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当地震信号通过复杂地球介质时 ,地层除了表现为各向异性 ,还表现为内在的黏弹性特征 因此 ,为准确描述地震波在地球介质中的传播特征 ,理想的地球介质模型应该能够模拟岩石的各向异性特征和衰减特征 .给出了各向异性黏弹性介质模型的波动方程 ,推导了伪谱法波场正演模拟的递推公式 ,并利用伪谱法实现了地震波波场数值模拟 .表明了该介质模型中地震波场特征与各向异性主轴方位和介质的黏滞性参数之间的关系
When the seismic signal passes through a complex Earth medium, the formation behaves as an anisotropic viscoelasticity. Therefore, in order to accurately describe the propagation characteristics of seismic waves in the Earth’s medium, the ideal Earth’s medium model should be able to simulate Anisotropy characteristics and attenuation characteristics of the anisotropic viscoelastic medium are given.The wave equation of the anisotropic viscoelastic medium model is given and the recursion formula of pseudo-spectral wavefield forward modeling is deduced.The numerical simulation of the seismic wavefield is realized by using the pseudo-spectral method Relationship between seismic wave field characteristics and anisotropy principal axis orientation and medium viscosity parameters in this medium model