A lot vs. Alot: 9 Grammatical Pitfalls
an elastic shock wave that travels through the earth, as from an earthquake or explosion; also, one of four distinct waves generated by an earthquake
Note: Seismic waves travel through the Earth and can be detected far from their source.
Note: Most of our knowledge of the Earth's interior comes from studying seismic waves.
Note: The measurement of seismic waves is also important in detecting underground nuclear tests.