Linked from
The 52 pages that link to Seismic wave, each with the reason it gives.
Wave equationRelated: Seismic waves are modeled by elastic wave equations in Earth's materials.
AmplitudeRelated: Seismographs use recorded wave amplitudes to assess ground motion and event size.
Sound speedRelated: Seismic speeds reveal properties and structure within Earth.
Earth's coreRelated: Wave speeds and paths expose the core's boundaries and liquid or solid state.
Shear modulusRelated: Shear-wave speed depends on shear modulus and material density.
Richter scaleRelated: The scale uses seismic-wave amplitudes as its measurement input.