Patent ID: 7953556

Claim:
A method for extracting wavefields from a hydrophone gather and a geophone gather, comprising: windowing the hydrophone and geophone gathers; performing a three-dimensional (3-D) time-slowness (tau-P) transform on each of the windowed gathers; dividing each tau-P transform into N frequency bands to form N hydrophone frequency bands and N geophone frequency bands; determining an envelope of each frequency band for the N hydrophone frequency bands and for the N geophone frequency bands; determining an envelope ratio for each frequency band, wherein the envelope ratio for the Nth frequency band is a ratio of the envelope for the Nth hydrophone frequency band to the envelope for the Nth geophone frequency band; scaling each of the geophone frequency bands by the corresponding envelope ratio for each frequency band; summing the scaled geophone frequency bands; performing an inverse tau-P transform on the summed, scaled geophone frequency bands; and outputting the inverse-transformed geophone gathers to a display.