An elastic wave in the earth produced by an earthquake or other means.
- Earthquakes set off seismic waves in the earth.
- For three years, the seismometers recorded how seismic waves from hundreds of earthquakes worldwide bounced through the mantle.
- In seismic reflection surveying, seismic waves are propagated through the subsurface and the travel times are measured of those waves that return to the surface after reflection at geological surfaces.
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