Abstract
Three methods have been employed at Little America V to determine seismic velocity as a function of depth in the Ross ice shelf: (1) refraction‐shooting interpreted by means of the Herglotz‐Bateman‐Wiechert integral, (2) seismic logging of a deep borehole, (3) Robin’s formula relating P wave velocity to the density and temperature measurements made in the borehole. Results of the three methods are compared, discrepancies are discussed, and the preferred P and S velocity‐depth profiles are obtained. From the profiles and the measurements of density in the borehole, a complete determination of the elastic properties of the ice shelf is possible. Small velocity differences are obtained at depth by the methods of refraction‐shooting and borehole‐logging. The effects of crystal orientation on seismic velocity is discussed and found to be sufficient to account for the differences. A new determination of the variation of seismic velocity in ice as a function of temperature is made on the basis of recent experimental work.
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