Patent ID: 7376046

Claim:
A method of seismic surveying using slip sweep technique having at least a first vibrator group and a second vibrator group, the method comprising: actuating a vibrator in the first vibrator group at time T 0 with a fundamental sweep; actuating a vibrator in the second vibrator group at time T 1 with a fundamental sweep, where T 0 <T 1 <T 0 +S 1 +L, where S 1 is the sweep time of the first vibrator group and L is the listening time and wherein T 1 −T 0 >(n− 1 )*S 1 *f 1 /(n*(f 1 −f 0 )), where n is a natural number, f 0 is the lower frequency limit of the vibrator sweep and f 1 is the upper frequency limit of the vibrator sweep; recording the earth responses as seismic surveying data; correlating the seismic surveying data with the fundamental sweep; correlating the seismic survey data with a harmonic frequency sweep; estimating the noise due to the harmonic frequency sweep; and removing the noise due to the harmonic frequency sweep from the seismic survey data.