Abstract
Summary The form, amplitude, and velocity of the shear head wave produced at the boundary between carbon tetrachloride and perspex are observed. A theoretical analysis is developed and its predictions agree well with the experimental results. The calculated and observed head wave amplitudes agree to within I per cent if certain assumptions are made about the absorption of shear waves in perspex, and the attenuation rates to within 7 per cent. The observed waveform confirms the analysis that the form of the S head wave is different from that of the P head wave. Instead of being a simple time integral of the direct pulse the S head wave contains an additional phase distortion term.
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