【摘要】 射线追踪方法是研究地震波传播的重要手段。射线追踪有多种算法 ,相比而言 ,以 L angan等人的算法最好 ,它不仅适用于复杂介质模型 ,而且能够保证计算精度及效率。本文对 L angan(1985 )提出的基于程函方程的常梯度速度射线追踪方法进行了深入的研究 ,并对该射线追踪方法的实现以及在复杂介质的速度建模中的应用进行了有益的探索。算法中考虑了反射波、透射波和临界反射。理论试算进一步表明 ,该射线追踪方法对复杂介质具有较好的适应性。更多还原

【Abstract】 Ray-tracing method is an important mean in study of seismic wave transportation. It has many algorithms,in comparison,the algorithm of Langan et al is the best,which is not only adaptable to the models in complex mediums but also can guarantee the computational precision and efficiency.The paper deeply studied the eiconal-function-based constant gradient velocity ray-tracing method presented by Langan (1985) and made useful probe into the realization of the ray-tracing method and the application of velocity model-building in complex medium.The reflection wave,transmission wave and critical reflection are considered in the algorithm.The theoretical tests showed that the ray-tracing method has good adaptation to complex medium.更多还原