基于双线性插值的三维地震波旅行时计算

针对地震波射线追踪方法中有效计算地震波旅行时及提高计算精度的问题，为克服传统射线追踪算法（即初值问题的试射法和边值问题的弯曲法)的不足，对三维介质模型下的地震波旅行时

COMPUTATION OF THREEDIMENSIONAL SEISMIC TRAVELTIME BASED ON BILINEAR INTERPOLATION

The computation of seismic traveltime is important content of ray tracing method,how to calculate the seismic traveltime effectively and increase the computation accuracy are widely concerned.In order to overcome the shortcomings of the traditional ray tracing algorithm(Shooting method of initial value and Bending method of boundary value),A variety of new methods and new technologies have been improved in the past 10 years.With the development of seismic exploration technology,it is necessary to study the computation of seismic traveltime and the methods of ray tracing in threedimensional medium model.Based on the linear traveltime interpolation (LTI) method to calculate twodimensional seismic traveltime,in this article,a method to calculate the threedimensional seismic traveltime is proposed by using bilinear interpolation,and its calculation formula deduced.Through numerical simulation calculation and the contrast with the analytic solution,the correctness of the principle of the method is proved,but also the method proved with a higher computation accuracy.