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Ground roll attenuation using the S and x‐f‐k transforms
Author(s) -
Askari Roohollah,
Siahkoohi Hamid R.
Publication year - 2008
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.2007.00659.x
Subject(s) - fourier transform , offset (computer science) , attenuation , geology , frequency domain , economic geology , time–frequency analysis , short time fourier transform , algorithm , fast fourier transform , acoustics , filter (signal processing) , computer science , physics , optics , seismology , mathematics , fourier analysis , mathematical analysis , computer vision , telmatology , tectonics , programming language
Ground roll, which is characterized by low frequency and high amplitude, is an old seismic data processing problem in land‐based seismic acquisition. Common techniques for ground roll attenuation are frequency filtering, f‐k or velocity filtering and a type of f‐k filtering based on the time‐offset windowed Fourier transform. These techniques assume that the seismic signal is stationary. In this study we utilized the S, x‐f‐k and t‐f‐k transforms as alternative methods to the Fourier transform. The S transform is a type of time‐frequency transform that provides frequency‐dependent resolution while maintaining a direct relationship with the Fourier spectrum. Application of a filter based on the S transform to land seismic shot records attenuates ground roll in a time‐frequency domain. The t‐f‐k and x‐f‐k transforms are approaches to localize the apparent velocity panel of a seismic record in time and offset domains, respectively. These transforms provide a convenient way to define offset or time‐varying reject zones on the separate f‐k panel at different offsets or times.