利用层析成像方法反演近地表速度模型

由于地表条件复杂和近地表速度变化显著给近地表速度模型的反演工作带来了很大的困难。层析成像方法可以较好地模拟介质横向和纵向的速度变化,能同时考虑直达波、透射波、回折波、折射波等初至波,为确定近地表速度结构提供了有效的工具。主要介绍了层析成像的方法原理,并应用此方法反演了实际地震探区的近地表速度模型,取得了良好的应用效果。

BUILDING OF NEAR SURFACE VELOCITY MODEL USING TOMOGRAPHY INVERSION METHOD

Because of the tough surface condition and the variable near-surface velocity,the inversion of the near surface velocity model has become a great difficult problem. The method of tomographyprovides an effective tool for the inversion of the near-surface velocity model. It can simulate horizontal and vertical variable velocity medium and make use of various first arrival traveltimes at the same time. In this paper we first introduced the algorithm ofraytracingtomography. Then, we finished the inversion of the near-surface velocity model of seismic exploration area using this method. The final inversion result was satisfactory.