Combining Active- and Passive-Source Measurements to Profile Shear Wave Velocities for Seismic Microzonation

Document Type

Conference Proceeding


A surface wave measurement made by combining active- and passive- source methods was adopted to characterize shear wave velocity (VS) profiles at a dozen sites around the Las Vegas basin for the purpose of seismic microzonation. The active- and passive-source methods used were the SASW and ReMi methods, respectively. The dispersion datasets developed by both methods for the same location generally exhibited excellent agreement. They are supplementary to one another in that the active-source measurement provides detailed information at shallower depths but depth of resolution is constrained by the capability of the seismic source, while the passive-source measurement yields a greater depth of resolution but provides less detail at shallower depths. The VS profiles were developed by inverting the combined dispersion dataset using simulated annealing followed by linearized inversion. Trends in overall VS for each site tend to be inversely related to basin depth, which is appropriate based on lithologic cues.


Civil and Environmental Engineering | Engineering | Environmental Engineering


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