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Khan Academy
Khan Academy: Seismic Waves and How We Know Earth's Structure: Seismic Waves
Video lecture explores S-waves and P-waves. [8:38]
Incorporated Research Institutions for Seismology
Iris: Seismic Waves: P, S, and Surface
Video lecture on wave motions and speeds of three fundamental kinds of seismic waves: Primary (P = pressure) waves; Secondary (S = shear); and Surface waves. [3:10]