Studying the travel paths of seismic waves in the interior of the Earth. Find out what the paths look like and why. [1:31]

This introduction to seismic wave behavior describes Snell's Law and how it applies to layers in the earth. It addresses reflected, refracted, critically refracted, and head waves. Seismic waves travel at different speeds through...

An animation which illustrates how the travel time of an earthquake is measured. What alters the velocity of the waves? [1:06]

How are wave paths determined? Which wave paths are the fastest? Find out with the help of this brief video. [0:43]