The radiation impedance of a circular disk vibrating torsionally on an anelastic half-space has resonance peaks with a spacing that is a function of the ratio between baseplate radius and seismic wavelength. The presence of a surface layer produces an impedance curve which oscillates around the half-space response. With impedance measurements over a sufficiently broad frequency range (up to about 500 Hz), it may be feasible to use half-space oscillations and the layer resonances to determine the shear velocity and thickness of the layer of material beneath the baseplate.--Modified journal abstract.

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