- Check that you won't have aliasing. Do this by viewing the amplitude
spectra of your data. Do this with
**suspecfx**suspecfx < data.su | suxwigb

- If the bandwidth of your data extends beyond the new nyquist frequency
of your data (which, in this example, will be half of the original nyquist
frequency) then you will have to filter your data to fit within
its new nyquist bandwidth. Do this with
**sufilter**sufilter < data.su f=f1,f2,f3,f4 amps=0,1,1,0 > data.filtered.su

Here, the**f1 f2 f3 f4**are the filter corner frequencies and**amps=0,1,1,0**indicate that the filter is a bandpass filter. - Now you may resample your data with suresamp:
suresamp < data.filtered.su nt=NTOUT dt=DTOUT > data.resampled.su