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MASW Multichannel Analysis of Surface Waves

First introduced in GEOPHYSICS (1999), the multichannel analysis of surface waves (MASW) method is one of the seismic survey 
methods evaluating the elastic condition (stiffness) of the ground for geotechnical engineering purposes.  MASW first measures 
seismic surface waves generated from various types of seismic sources—such as sledge hammer—analyzes the propagation 
velocities of those surface waves, and then finally deduces shear-wave velocity (Vs) variations below the surveyed area that is most 
responsible for the analyzed propagation velocity pattern of surface waves.  Shear-wave velocity (Vs) is one of the elastic constants 
and closely related to Young’s modulus.  Under most circumstances, Vs is a direct indicator of the ground strength (stiffness) and 
therefore commonly used to derive load-bearing capacity.  After a relatively simple procedure, final Vs information is provided in 1-D, 
2-D, and 3-D formats.