Abstract
Laboratory measurements of shear wave attenuation as a function of frequency were made using recently developed ceramic bimorph bender transducers to excite transverse particle motion in a medium grain water-saturated sand. The measurements were made at 13 frequencies from 450 to 7000 Hz. Multicycle sine-wave pulses were used to insure steady-state vibration at the measurement frequency. Attenuation was determined from the slope of a linear least-squares fit to the maximum received level versus transducer separation data. This not only affords an estimate of the attenuation but allows confidence intervals to be placed around that estimate. The attenuation values’ which increased with frequency from 5 dB/m at 450 Hz to 120 dB/m at 7000 Hz’ did not exhibit a simple first-power frequency dependence. The results were compared with predictions based on a two-component model developed by Stoll and were consistent in both amplitude and frequency dependence.
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