A method for vibroseis data harmonic filtering

We analyze in this paper the causes of harmonics generated in vibroseis slip-sweep,and point out that the high order harmonics are the most se-rious noise.We discuss the slip-sweep through the theory analysis and numerical experiments.Based on the linearity between the energy of high order harmonics and reference signals in every frequency brand,we build a mathematical model for harmonic filtering.We utilize reference signal multiplication to generate every order harmonics,and estimate the energy ratio between every order harmonics.Application results on seismic data show that this harmonic filtering method can not only effectively remove harmonics,but also achieve fast calculations.