Module 1 : Site Exploration and Geotechnical Investigation
Lecture 5 : Geophysical Exploration [ Section 5.1 : Methods of Geophysical Exploration ]
   
  These shocks generate three types of waves.
Longitudinal or compressive wave or primary (p) wave,
Transverse or shear waves or secondary (s) wave,
Surface waves.
 

It is primarily the velocity of longitudinal or the compression waves which is utilized in this method. The equation for the velocity of the p-waves and s-waves is given as,

  ------- (1.2.1)
  ------- (1.2.2)
 

Where,

E is the dynamic modulus of the soil,

is the Poisson's ratio,

is density and,

G is the dynamic shear modulus.

 
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