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Underground Void Locating Using Seismic Method - Multichannel Analysis of Surface Waves (MASW)

Enviroprobe recently conducted an underground void locating survey at a traveling center in New Jersey. MASW instead of electrical resistivity tomography (ERT) was used due to reinforced concrete in the survey areas. MASW is one of the seismic survey methods evaluating the elastic condition of subsurface materials. MASW measures seismic surface waves generated from a seismic source, analyzes the propagation velocities of those surface waves, and then finally deduces shear-wave velocity (Vs) variations of subsurface materials. For each survey area, survey lines were laid out in a grid pattern. A 2 dimensional (2D) MASW survey was conducted along each line. A sledge hammer was used to strike a

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