Scott Stovall (spstovll@memphis.edu), Andy Kizzee (akizzee@memphis.edu) and Shahram Pezeshk (spezeshk@memphis.edu), Department of Civil Engineering,The University of Memphis

Spectral analysis of surface waves (SASW) and refraction micro-tremors (ReMi) are two non-intrusive methods used for determining in situshear-wave velocities. While both methods applied individually have shown to produce reasonable results, both suffer from poor resolution over specific frequency ranges.The SASW method produces good results in the upper 30 meters controlled by frequencies above 5 Hz where signal to noise ratios are acceptable. The ReMi method produces good results in the frequency range of 2 to 15 Hz but suffers from lack of high frequency ambient noise and spatial aliasing. By combining the two methods, we can produce a composite dispersion curve with higher accuracy in both low and high frequency ranges resulting in a better determination of shear wave velocity profile.