= Solution
Choose shot and receiver intervals to sample the shortest relevant spatial <wavelength> and steepest event moveout without <spatial aliasing>. A simple bound is
$$
\Delta x\lesssim\frac{v_{\mathrm{app,min}}}{2f_{\max}},
$$
using the smallest apparent velocity of the events one needs to retain or separate. Using $1500\,\mathrm{m\,s^{-1}}$ and $100$ Hz alone suggests $7.5$ m, but slower surface waves or dipping events can demand finer spacing. It is not a universal final design interval.
Also consider target depth and lateral resolution, <reflector dip>, near-surface heterogeneity, source strength and coupling, maximum offset and aperture, common-midpoint bin size and <seismic acquisition fold>, refraction crossover distances, access and budget. Receiver spacing and source spacing jointly determine coverage and cannot be selected from temporal sampling alone.
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