
%0 Journal Article
%A Amano, H. 
%A Ohta, Y. 
%T Separation of P waves and S waves in the VSP wavefield on the basis of a forward modelling technique
%J Exploration Geophysics
%D 1991/03/01
%V 22
%N 1
%P 1-4
%K 
%R https://doi.org/10.1071/EG991001
%U https://www.publish.csiro.au/paper/EG991001 
%X Separation of P waves and S waves in the VSP wavefield is proposed on the basis of a synthetic forward modelling technique. The weak wavefield masked by dominant wave trains can be extracted with this method. The decomposed wavefield is expressed in frequency-depth (f-z) domain as a linear combination of up to third order differential of traces, which is approximated by trace differences in the practical separation process. In general, five traces with single-component data are required in this process, but the same process is implemented with only three traces in the acoustic case. Two-trace extrapolation is applied to each edge of data gather in order to enhance the accuracy of trace difference. Since the formula is developed in f-z domain, the influence of anelasticity is taken into account with simplicity and the calculation is fast enough with the benefit of the fast Fourier transform (FFT). 
