FIGURE 3.53 Schematic diagram of spectral analysis of surface waves (SASW) testing setup. (From S. Nazarian, D. Yuan, and M. R. Baker, Rapid Determination of Moduli with Spectral-Analysis-of-Surface-Waves Method, The University of Texas at El Paso, El Paso, Texas, Report No. TX-94 1243-1, November 1995, with permission)