Signal restoration in numeral simulation of seismic wave field

Forward modeling methods based on wave equation have been widely applied in seismic data acquisition, processing, and interpretation. In order to select optimal grid and good computation efficiency to recover the entire signal, aiming at the Ricker wavelet commonly used in forward modeling, we analyzed the alias and signal restoration problem in finite-difference method based on spatial sampling theorem and seismic wave traveling regulation in media with different velocity, to derive quantitative relationship among the modeling grid size, minimum velocity of model layer, and recovered main frequency of wavelet. At last we verified this relationship by a numerical example.