The processing of seismic data often uses an imaging condition where an upward propagating waveform is correlated with a downgoing waveform to estimate reflectivity. The cross correlation includes multiple energy that produces low frequency noise that contaminates a migrated imaging. This noise can be removed by a low cut filter that is counter to the requirement of low frequencies that are required for full waveform inversion. I demonstrate a simplified process that eliminates the low frequency noise.
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