...migration.

As such, the subsurface offset axis of the image will probably not be densely populated. To fill the offset axis, multiple planewave migrations can be summed after convolving the data with various ray parameters Liu et al. (2002); Sun et al. (2001).

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...trace)

$n_\tau$ will be O(10⁷) for just one day of data collected at 0.004s sampling rate.

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