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The surface response of the viscoelastic halfspace to a subsurface (dipole) excitation as a function of radial position r for four different frequencies: (a) 40 Hz, (b) 80 Hz, (c) 200 Hz, and (d) 400 Hz. Columns: (1) Voigt model; (2) Fractional order Voigt model; (3) SLS model. (○○○) experimental measurement; (-⋅-) compression wave component; (⋯) shear wave component; (——) sum of compression and shear waves.
