Seismic Refraction

The seismic refraction method is used to estimate subsurface structures by using elastic waves velocity. Artificial elastic waves (seismic waves) are generated near the ground surface and their travel time is measured using a linear array of geophones. At the boundaries between layers with contrasting wave propagation velocities the waves are refracted when they reach critical angle – head waves. Using the travel time of the refracted waves, it is possible to assess the structure of ground.

Seismic shot
Using sledgehammer and plate to energise the ground
Seismic shot
Raw seismic shot
Travel time plot
Travel time plot

 

Velocity section
Velocity section