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True-amplitude wavefield separation using staggered-grid interpolation in the wavenumber domain
Pages: 437-446+510
Year: Issue:  4
Journal: Applied Geophysics

Keyword:  wavefield separationamplitude preservationstaggered-grid finite differencewavenumber domain interpolationreverse-time migration;
Abstract: Wavefield separation of multicomponent seismic data to image subsurface structures can be realized in either the space domain or the wavenumber domain. However, as the particle velocity components used in the wavenumber-domain wavefield separation are not defined at the same grid point with the staggered-grid finite-difference method for elastic wavefield simulation, we propose the wavenumber-domain interpolation method to estimate the required values at the common grid points prior to the wavenumber-domain true-amplitude wavefield separation. Moreover, numerical experiments show that the wavenumber-domain interpolation method has high interpolation accuracy and the trueamplitude wavefield separation method shows good amplitude preservation. The application of the proposed methodology to elastic reverse-time migration can obtain good amplitudepreserved images even in the case of some velocity error.
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