Angle gathers provide an extra dimension to analyze the velocity after migration. Space-shift and time shift-imaging conditions are two methods used to obtain angle gathers, but both are reasonably expensive. By scaling the time-lag axis of the time-shifted images, the computational cost of the time shift imaging condition can be considerably reduced. In imaging and more so Full waveform inversion, frequency-domain Helmholtz solvers are used more often to solve for the wavefields than conventional time domain extrapolators. In such cases, we do not need to extend the image, instead we scale the frequency axis of the frequency domain image to obtain the angle gathers more efficiently. Application on synthetic data demonstrate such features.


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  1. Biondi, B. and Tisserant, T.
    [2004] 3d angle-domain common-image gathers for migration velocity analysis. Geophysical Prospecting, 52(6), 575–591, ISSN 1365-2478, doi: 10.1111/j.1365‑2478.2004.00444.x.
    https://doi.org/10.1111/j.1365-2478.2004.00444.x [Google Scholar]
  2. Khalil, A., Sun, J., Zhang, Y. and Poole, G.
    [2013] RTM noise attenuation and image enhancement using time-shift gathers, chap. 733. 3789–3793, doi:10.1190/segam2013‑0600.1.
    https://doi.org/10.1190/segam2013-0600.1 [Google Scholar]
  3. Sava, P. and Fomel, S.
    [2006] Time-shift imaging condition in seismic migration. GEOPHYSICS, 71(6), S209–S217, doi: 10.1190/1.2338824.
    https://doi.org/10.1190/1.2338824 [Google Scholar]
  4. Sava, P. and Vasconcelos, I.
    [2011] Extended imaging conditions for wave-equation migration. Geophysical Prospecting, 59(1), 35–55, ISSN 1365-2478, doi: 10.1111/j.1365‑2478.2010.00888.x.
    https://doi.org/10.1111/j.1365-2478.2010.00888.x [Google Scholar]

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