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Analyzing Earthquake
| Term | Definition |
|---|---|
| Body Wave | An earthquake waves that travels through the body of Earth rather than on its surface. See also P-Wave, S- Wave, and Surface Wave |
| Surface Wave | An earthquake waves that travels at or near the surface of Earth |
| P-Wave | A primary (Compressional) earthquake waves that travels through the body of Earth; so named because it is the first wave to reach a seismograph station during an earthquake. See also S |
| S-Wave | A secondary earthquake wave, so named because it travels slower than a primary wave and is the second wave to reach the seismograph station after an earthquake. It travels through the body of Earth as a series of crests and troughs. See also P-Wave |
| Aftershock | An earthquake that occurs later along the same fault zone as a major earthquake, but before the area has returned to its normal level of seismic activity |
| Epicenter | Location on Earth's surface directly above an earthquakes focus, or origin |
| Focus | Location beneath earth's surface where the energy of an earthquake is release |