Multi channel surface wave analysis method for undulating terrain
The traditional multi-channel analysis of surface wave(MASW)method is not applicable to rugged terrain conditions,which limits the application scenarios of MASW.Firstly,based on the principle of beamforming analysis,a forward algorithm of multi-channel surface wave dispersion curves in media with rugged topography and horizontal stratigraphic interfaces is presented.The numerical analysis results indicate that,compared to the traditional dispersion curve forward algorithm based on the assumption of horizontal strata,the dispersion curve obtained by the forward algorithm of this paper is more consistent with the dispersion curve extracted from simulated seismic records.Secondly,an inversion strategy is proposed,which takes the velocity of shear waves and the elevation of the formation interface as inversion parameters to achieve the inversion of multi-channel surface wave dispersion curves under rugged terrain.The shear wave velocity profile obtained by the MASW method established in this paper is more consistent with the geological model than traditional MASW methods,which verifies the effectiveness of the method.
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