Gehrig, Inc. is proud to announce their newest seismic capabilities – MASW surveying. The multichannel analysis of surface waves (MASW) evaluates the elastic condition (i.e. stiffness) of the subsurface conditions. Shear wave velocity (Vs) is one of the elastic constants and is closely related to Young’s modulus. Vs structure is typically derived from the fundamental mode Rayleigh wavefield generated by an active and/or passive source. MASW surveys are typically used for geotechnical engineering purposes – such as Vs30 profiling, bedrock mapping, finite element modeling, transmission of vibrations generated by trains, wind turbines (such as that shown in the pictorial example) or other vibration machines, construction vibration, surface/underground explosions, or vehicular traffic. MASW surveys can provide a 1D, 2D or 2.5D shear wave velocity (Vs) profile of the subsurface conditions.

MASW is one of the easiest seismic methods typically providing highly competent Vs results. Data acquisition is significantly more robust than any other seismic methods because a high signal-to-noise ratio (S/N) can be easily achieved. High S/N is due to the fact that seismic surface waves are the strongest seismic waves generated from any impact source and can traveling much longer distances than body waves.