Buffington, Hamilton, and Moore 



successful measurements were made from DEEPSTAR at 14 and 7 

 kc/ s, and at all three frequencies from the diving boat in water 

 depths to 100 feet. 



Fig. 5 - Velocity probes and core tubes 

 mounted on the brow of DEEPSTAR 4000 



Measurements of sound velocity were made in sediments hav- 

 ing ratios of sound velocity in sediment/ velocity in bottom water 

 from 0. 979 to 1. 212, Sediments having sound velocities less than 

 that in the bottom water were measured at several stations. The 

 techniques of relating laboratory measurements of sound velocity to 

 in situ values, determined during the TRIESTE program, were veri- 

 fied. There were no measurements indicating a velocity dispersion 

 (dependence of velocity on frequency). 



The attenuation measurements will be completed when the 

 DEEPSTAR returns to NEL, and will be reported in a future paper. 



88 



