# Tuning and resolution

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Tuning thickness is usually computed as one quarter of the wavelength, the Rayleigh criterion:

where `v` is interval velocity and `f` is the maximum frequency (at –20 dB). Only forward modelling can really address the question of tuning in your data.

Note that the minimum thickness for which you can interpret separate events for top and base is greater than the tuning thickness. Note also that even though you cannot interpret top and base events, it may be possible to model thickness from amplitude around the tuning thickness.

Spatial resolution (Fresnel diameter after migration) is often computed a one half of the wavelength: