A combination of spectral and velocity analysis, using an ultrasonic pulse technique, has been performed on two lithologies of building stone: limestone and sandstone. Measurements of compressional and shear wave velocities have been made and the results obtained compared with the data provided from analyses of the frequency spectra so obtained from these rocks. It appears that the centre frequency and attenuation calculated from the frequency spectra provide useful quantitative measures of rock quality which augments that obtained from measurements of velocity alone, especially in saturated specimens. The potential value of using the centre frequency and attenuation as references to study the progressive change of rock quality during weathering has yet to be assessed.

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