Ground Roll Suppression using Wigner Distribution

A data processing strategy to suppress seismic noises by Wigner Distribution (WD) method through signal decomposition in time-frequency domain is demonstrated. The 48 WDs are used for a profile with 48 channel vertical component geophone records. The level seismograms from the 48 WDs of these geophones records are built. There are 256 Level Seismograms, but only some level seismograms in a certain level range can be used. From some reasonable approach that in the level range 70 to 100 the reflected wavephases dominate. Then the level seismograms from Level 70 to Level 100 are composed to get de-noised seismogram. The effects of the de-noising are better than the results of discrete wavelet transform (DWT), and the clear reflected wavephases are got. Therefore the WD- method has its advantage than others in this case.