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The Spectral-Analysis-of-Surface-Waves (SASW) technique is a nonintrusive, nondestructive technique that employs surface waves of the Rayleigh type to determine the layer thicknesses and stiffnesses of subsurface profiles. The SASW technique has been developed and successfully used on land. This paper extends the method to sites overlaid by water. A theoretical model has been developed to study the “surface” waves that propagate along a soil-water interface using a half-space overlaid by water as an approximation. The waves at the soil-water interface are termed “Scholte” waves. Results from the theoretical model show that in “deep” water, defined as a water depth exceeding the wave length of the Scholte wave, the effect of water is to reduce the surface wave velocity slightly from the velocity for a similar surface (Rayleigh) wave with air over the surface. Results of experimental studies are also described and shown to compare well with theoretical predictions.
nondestructive testing, in situ measurement, seismic waves, shear modulus, offshore, geophysical methods, SASW testing
Ashley H. Priddy Cenntenial Professor, University of Texas, Austin,
Brunswick-Abernathy Regents Professor, University of Texas, Austin,
Robert B. Trull Chair in Engineering, University of Texas, Austin,