cancel random noise but their main function,
I believe, is to cancel low-velocity coherent noises,
something we now see is handled effectively by steep-dip deconvolution.
While I do not advocate abandoning field arrays,
it is pleasing to notice that with the arrival of steep-dip deconvolution,
we are no longer so dependent on field arrays
and perhaps coherent noises can be controlled
where field arrays are impractical,
as in certain 3-D geometries.
A recently arrived 3-D shot profile from the sand dunes
in the Middle East is Figure 11.
The strong hyperbolas are ground roll seen in a line
that does not include the shot.
The open question here is,
how should we formulate the problem of ground-roll removal in 3-D?
Sand dunes. One shot, six parallel receiver lines.