Fast iterative method for seismic wave travel time calculation under undulating surface conditions

Seismic wave travel time is an important seismic attribute information and widely used in various forward inversion methods, including migration imaging, tomography, modeling other core data processing methods. The accuracy efficiency of the algorithm are for above In practical application exploration, it often carried out under condition undulating surface, which has a significant impact on calculation. Therefore, great significance to study efficient high-precision calculation method that can adapt surface condition. this paper, Fast iterative (FIM) modified topography method. employs solve equation function obtain by maintaining narrow band called active list, update all grid nodes list at time. We will verify computing power FIM through several different velocity models.