In addition, we also discussed the algorithm for 3-D pre-stack time migration of converted-wave in VTI media.The validity of pre-stack time migration method is verified by a theoretical model.

• 同时，讨论了基于VTI介质的三维转换波叠前时间偏移近似算法，利用理论模型验证了叠前时间偏移方法的正确性。