Question

What is seismic velocity?

Answer 1

The velocity of a seismic wave.

Explanation:

The term is assigned to the velocity in which a seismic wave travels (through the medium: earth's crust).
We can glance this rate with this: `v = d/t`

, being 'v' its velocity; 'd', distance and 't', traveltime.

Seismic velocity is a vector magnitude which varies laterally, vertically and azimuthally in an anisotropic (property dependable of the direction in which it is measured) medium.

It is directly proportional to depth in the Earth.
Why?
Due to the increasing compaction or density as one travels deep down Earth; porosity will lessen as well. This means seismic waves have more terrain or surface to travel through