Step-by-step explanation:
Seismic waves are elastic waves that are able to propagate within the subsurface.
The travel - time to depth expressed in form of velocity is used to determine the composition, thickness and density of the interior of the earth.
- Different earth materials shows different behavior in response of seismic waves.
- By checking the attributes of the waves as they go through the subsurface, we can predict some of the properties of the underlying beds.