The refraction microtremor (ReMi) method provides an effective and efficient seismic means to obtain general information about large volumes of the subsurface in one dimension with one setup, where appropriate setup length is related to the desired depth of investigation. Quality Geophysics has used the refraction microtremor technique to successfully estimate shear velocities in geotechnical site investigations. Long period records are recorded with and without active seismic sources; processed and interpreted using specialized software.  A subsurface model is developed in a fashion similar to surface wave dispersion models. ReMi and surface wave dispersion are often used in seismic hazard assessments for hazard classification and building design.