Summary:
- 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.