Both MASW (Multichannel Acquisition Surface Waves) and REMI (Refraction Microtremor Arrays) consist in the characterization of surface seismic waves and specifically for Vs (shear wave velocity). MASW uses an active seismic source and registers high frequencies signal while REMI uses passive sources and registers medium-low frequencies. Together they allow obtaining the total velocity dispersion over the complete frequency range to obtain Vs.