ABSTRACT
Based on this concept, the SASW method allows a surface impulse impact that excites a wave group covering a variety of wave lengths, and then analyzes the dispersion characteristics of the waves recorded by a pair of sensors with a certain spacing at the same surface. Empirically, the impulse impact is performed by a mechanical impact, namely hammering with a steel sphere. The dispersion characteristics is conventionally analyzed in Fourier-based frequency domain, while a Waveletbased time-frequency domain analysis could be an alternative (Kim & Park 2002) for tackling various noises in some field conditions. The later technique was illustrated in some numerical studies (e.g. Tsai et al. 2014), but not yet fully verified in practice so far.
