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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Anisotropic complex Padeacute hybrid finite-difference depth migration

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Autor(es):
Amazonas, Daniela [1] ; Aleixo, Rafael ; Schleicher, Joerg [2] ; Costa, Jesse C. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Fed Univ Para, Fac Geophys, BR-66059 Belem, Para - Brazil
[2] Univ Estadual Campinas, Dept Appl Math, Inst Math Stat & Sci Comp, IMECC, Campinas, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: GEOPHYSICS; v. 75, n. 2, p. S51-S59, MAR-APR 2010.
Citações Web of Science: 4
Resumo

Standard real-valued finite-difference (FD) and Fourier finite-difference (FFD) migrations cannot handle evanescent waves correctly, which can lead to numerical instabilities in the presence of strong velocity variations. A possible solution to these problems is the complex Padeacute approximation, which avoids problems with evanescent waves by rotating the branch cut of the complex square root. We have applied this approximation to the acoustic wave equation for vertical transversely isotropic media to derive more stable FD and hybrid FD/FFD migrations for such media. Our analysis of the dispersion relation of the new method indicates that it should provide more stable migration results with fewer artifacts and higher accuracy at steep dips. Our studies lead to the conclusion that the rotation angle of the branch cut that should yield the most stable image is 60 degrees for FD migration, as confirmed by numerical impulse responses and work with synthetic data. (AU)

Processo FAPESP: 06/04410-5 - Remigração mediante equações da onda-imagem em meios anisotrópicos
Beneficiário:Rafael Aleixo de Carvalho
Modalidade de apoio: Bolsas no Brasil - Doutorado