| A | B |
|---|
| Seismology | Study of earthquakes |
| Seismic waves | Waves of energy that travel through the Earth |
| Elastic rebound | Sudden return of elastically deformed rock to its original shape |
| P Waves | Travels through solids, liquids, and gases; are the fastest seismic waves |
| Deformation | Change in the shape of rock, in response to stress |
| Fault | Break in the Earth's crust along which blocks of crust slide relative to one another |
| S Waves | Shear waves; shear back and forth. They are liquid and are slower than P Waves |
| Seismograph | Instruments located at or near the surface of the Earth that record seismic waves |
| Focus | The point inside the Earth where an earthquake begins |
| Seismogram | A tracing of earthquake motion created by a seismograph |
| Epicenter | The point on the Earth's surface directly above an earthquake's starting point |
| Gap Hypothesis | States that new sections of active faults that have had relatively few earthquakes are likely to be the sites for strong earthquakes in the future |
| Seismic Gaps | The areas along the fault where very few earthquakes have occured |
| Shadow Zone | An area on the Earth's surface where no distinct seismic waves from a particular earthquake can be detected |
| Moho | The place within the earth where the speed of seismic waves increases sharply |
