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Focus
the area beneath Earth's surface where rock that was under stress begins to break or move
Seismic waves
Vibrations that are similar to sound waves, they travel through Earth carrying energy released by an earthquake.
P Wave
Seismic waves that compress and expand the ground like an accordian
S wave
Seismic waves that can vibrate from side to side or up and down.
Seismograph
instrument that records and measures an earthquake’s seismic waves.