Seismic Methods: seismic waves reflection and refraction

This video is the second lecture from five lectures that explain the principles of the seismic methods. This lecture explains the principal physical concepts of seismic waves, the main topics are: 1- Geometry of seismic wave paths, Snell's Law 2- Reflection and refraction 3- Critical refraction 4- Reflection coefficient 5- Time-distance relations #seismic