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Expanded Polystyrene (EPS) - block geofoam has been successfully used in many civil engineering applications such as lightweight fill in roadway embankments over soft ground and in landslide stabilization and repair. Seismic loading can affect both external and internal stability of an embankment containing EPS-block geofoam. The geofoam dynamic parameters required to perform seismic analysis are the shear wave velocity, shear modulus and damping ratios. Currently, these parameters are obtained predominantly from laboratory testing such as resonant column and cyclic triaxial tests. However, laboratory tests are typically performed on small specimens and not on full-size geofoam blocks. Additionally, it is difficult to reproduce the field stresses and strains in conventional dynamic laboratory testing. Techniques such as Spectral Analysis of Surface Waves (SASW) are commonly used in geotechnical practice to measure the shear wave velocity of soils. MASW (Multi-Channel Analysis of Surface Waves) tests were performed on full-size EPS blocks to evaluate the feasibility of using geophysical techniques to measure the dynamic parameters of geofoam for use in seismic analysis. Results of the feasibility study suggest that MASW tests may be a reliable and economical procedure for determining the shear modulus of geofoam blocks.