Patent ID: 7675812

Claim:
A method for separating multiple reflections from marine seismic signals, comprising on a computer: coherency filtering the seismic signals, the seismic signals acquired from a plurality of seismic sensors deployed in a body of water in response to actuation of a seismic energy source in the water; low pass filtering the seismic signals at a selected frequency; high pass filtering the seismic signals at the selected frequency, the frequency selected such that substantially only multiple reflections exist in the seismic signals above the frequency generating a mask having unity value where the high pass filtered signal amplitude exceeds a selected threshold, the mask having zero value for all other high pass filtered signals; multiplying the mask value by the low pass filtered signals; adding the multiplied signals to the high pass filtered signals to generate a model of the multiple reflections; subtracting the multiple reflection model from the coherency filtered seismic signals; and at least one of storing and displaying a result of the subtracting.