From SEG Wiki
Jump to navigation Jump to search

To avoid aliasing, frequencies above the Nyquist frequency must be removed by an alias filter (q.v.) (also called an antialias filter) before sampling. Aliasing is an inherent property of all sampling systems and it applies to (e.g.) sampling at discrete time intervals, as with digital seismic recording, to the sampling which is done by the separate elements of geophone and source arrays (spatial sampling), and to sampling such as is done in gravity surveys where the potential field is measured only at discrete stations, etc.