摘要
Based on the first order wave equation separation,the similar formula for second-order wave equation separation method is deduced in this paper,which has a simple form and easy derivation over the original one.The separated first-and se-cond-order wave equation is solved with regular-and staggered-grid pseudo-spectral method.As a result,the P and S wavefield can be obtained directly.Comparing with the first-order and the second-order pseudo-spectral method,and separation and non-separation method,our results show that the first-order and second-order pseudo-spectral methods have same effect in wavefield simulation,but first-order one is good at the traveltime picking,while the second-order one is advantageous over the first-order one in terms of the wavelet amplitude preservation,waveform protection and wavefield separation.The wavefiled separation simulation method has more flexible usage in computation projection.