Patent ID: 8811116
Filing Date: 2014-08-19
Classification: G01V

Abstract:
1. A method of performing a geophysical survey, comprising: using a plurality of vibratory seismic sources to generate a series of two or more seismic sweeps by activating a first set of one or more of the plurality of vibratory seismic sources to produce a first seismic sweep at time T determining a ground force generated by at least one of the first and the second seismic sweeps; using a plurality of receivers to measure seismic signals generated by the first and the second seismic sweeps; using the determined ground force to determine properties of the harmonics of the second sweep at one or more frequencies in the overlap region; using the measured seismic signals for a plurality of frequencies adjacent to the overlap region to determine weightings applicable to the harmonics of the second sweep, wherein the weightings applicable to the harmonics of the second sweep are determined from the following equation: where: ρ is a harmonic weighting for a frequency; f f