The dilatational and rotational wave velocities have been measured as functions of pressure and temperature for five granites. The pressure range was 200-5,000 bars or higher. Dilatational velocities were measured over the temperature range 20-300 degrees C.; rotational wave velocities over the range 20-200 degrees C. These data indicate that below fairly shallow depths in the granitic layer the velocity is constant or even slightly decreasing.

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