Surface Wave Suppression with Joint S Transform and TT Transform

The TT transform (Time-Time transform) is a new method to process non-stationary signal based on S transform, has a good ability of frequency conversion. The surface wave, with lower frequency compare with other seismic wave, can be suppressed through extracting the TT spectrum's diagonal elements of seismic data. However, this method has a deficiency that in pressing low-frequency signal, retaining a part of high-frequency interference that can be eliminated. But, the high-frequency interference can be removed by the S transform filtering. Therefore, a method of joint the S transform and TT transform to suppress surface wave is presented. Firstly, apply S transform time-frequency filtering for each trace seismic data to suppress the high frequency interference and random noise, and then, use TT filtering to suppress the surface wave with low frequency.