4.0 



3.0 - 



2.0 



1.0 



J watpr 



-I 1 1 — u 



1.0 2.0 

 Depth KM 



Figure 8. Variation with depth of compressional wave velocity (Vp) and 



shear wave velocity (V s ) for shallow and deep water sediments. 

 The compressional velocities are average curves representing 

 the seismic refraction data. The shear velocities are derived 

 from the compressional velocities by means of a velocitv-porosity 

 relation. (From Nafe and Drake, 1957. Used by permission.) 



32 



