【摘要】 完全弹性介质中，进行地震波射线追踪时需要确定射线的出射角；在非弹性介质中，除了确定此射线出射角之外，还需要确定另外一个角，即波前面与常振幅平面的夹角──衰减角。基于惠更斯原理，研究了确定射线出射角与衰减角的一种有效方法，进而对层状非弹性介质中地震波运动学问题进行了一定的理论研究与数值计算。更多还原

【Abstract】 In perfect elastic media,the tyacing of seismic rays requires to determinetheir emergence angle. But,in the visco elastic media,it is essential to determine not onlythe emergence angle,but also the attenuating angle,i.e. the angle between seismicwavefront and constant amplitude plane. On the basis of Hygens principle. we present anefficient method to determine the emergence angle and attenuating angle. Furthermore,wehave made both theoretic study and numerical computation for the seismic geometries inlavered viscoelastic media.更多还原