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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/13678
Tipo: Artigo de Periódico
Título: An efficient hybrid pseudospectral/finite-difference scheme for solving the TTI pure P-wave equation
Título(s) alternativo(s): Journal of Geophysics and Engineering
Autor(es): Zhan, Ge
Pestana, Reynam da Cruz
Stoffa, Paul L.
Autor(es): Zhan, Ge
Pestana, Reynam da Cruz
Stoffa, Paul L.
Abstract: The pure P-wave equation for modelling and migration in tilted transversely isotropic (TTI) media has attracted more and more attention in imaging seismic data with anisotropy. The desirable feature is that it is absolutely free of shear-wave artefacts and the consequent alleviation of numerical instabilities generally suffered by some systems of coupled equations. However, due to several forward–backward Fourier transforms in wavefield updating at each time step, the computational cost is significant, and thereby hampers its prevalence. We propose to use a hybrid pseudospectral (PS) and finite-difference (FD) scheme to solve the pure P-wave equation. In the hybrid solution, most of the cost-consuming wavenumber terms in the equation are replaced by inexpensive FD operators, which in turn accelerates the computation and reduces the computational cost. To demonstrate the benefit in cost saving of the new scheme, 2D and 3D reverse-time migration (RTM) examples using the hybrid solution to the pure P-wave equation are carried out, and respective runtimes are listed and compared. Numerical results show that the hybrid strategy demands less computation time and is faster than using the PS method alone. Furthermore, this new TTI RTM algorithm with the hybrid method is computationally less expensive than that with the FD solution to conventional TTI coupled equations
Palavras-chave: TTI wave equation
hybrid solution
Editora / Evento / Instituição: Journal of Geophysics and Engineering
Tipo de Acesso: Acesso Aberto
URI: http://repositorio.ufba.br/ri/handle/ri/13678
Data do documento: 2013
Aparece nas coleções:Artigo Publicado em Periódico (IGEO)

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