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Analyzing Earthquake
| Term | Definition |
|---|---|
| Body Wave | An earthquake Wave that travels through the body of Earth rather than on its surface. |
| Surface Wave | An earthquake Wave that travels at or near the surface of Earth |
| P-Wave | A primary (compressional) earthquake Wave 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-wave. |
| 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 earthquake's focus, or origin. |
| Focus | Location beneath Earth's surface where the energy of an earthquake is released. |