Refraction can be demonstrated by dropping ... Explain to students that seismic waves travel fast, on the order of kilometers per second. The speed of a seismic wave depends on many factors.

One of these methods is by setting up seismographic stations to measure seismic waves as they travel through the Earth—every moment of refraction, diffraction, and reflection of those shock ...

there is a sudden change in direction due to refraction. A surface wave travels along the surface of the Earth. It is the slowest of the three types of seismic wave. Surface waves usually have ...