Exploratorium
Exploratorium: Faultline: P and S Waves
The different types of earthquake waves are discussed and illustrated. Features geologist video clip.
Incorporated Research Institutions for Seismology
Iris: Seismic Waves Viewer
Visualize the propagation of seismic waves from historic earthquakes through Earth's interior and around its surface.
Science4Fun
Science4 Fun: Earthquake
Information about earthquakes including causes and how they are measured.