• A seismograph is a machine that records seismic waves.
  • A seismogram is a paper record of the seismic waves the seismograph received.
  • Wave height is used to determine the magnitude of the earthquake.
  • Seismographs contain a lot of information about an earthquake: its strength, length, and distance.
  • Information from seismic waves is fed into computers at seismic stations around the world.
  • The first waves are P-waves since they are the fastest.
  • S-waves come in next and are usually larger than P- Waves.
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