814 NAFE AND DRAKE [CHAP. 29 



modulus found by timing compressional and shear velocities over 100 ft of 

 sediment in situ may differ widely from that obtained by measurements on a 

 hand sample in the laboratory. If interpretation of seismic data is to provide in- 

 formation on sedimentary structure, then the physical constants most needed are 

 dynamic values and values determined by relatively large-scale measurement. 



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