# Translations:Mathematical foundation of 3-D migration/23/en

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which is the same as equation (**G-5**). This means that 3-D migration can be performed in two passes: 2-D migration in the inline direction followed by 2-D migration in the crossline direction. The above derivation of a 90-degree 3-D migration operator Levin ^{[1]} is based on the constant-velocity assumption.

- ↑ Jacubowicz and Levin (1983), Jakubowicz, H. and Levin, S., 1983, A simple exact method of 3-D migration — theory: Geophys. Prosp., 31, 34–56.