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Earthquake vocab
| Term | Definition |
|---|---|
| Fault | a break in earths crust where rock on one side moves in relation to rock on the other side |
| earthquake | A vibration in earths crust caused by the release of energy at a fault. |
| focus | The point inside earth where an earthquake begins |
| epicenter | the point on earths surface directly above the focus of an earthquake |
| P-waves | Primary waves; the fastest waves; the first waves to be detected; they compress and expand the ground as they travel. (push-pull) |
| S-waves | Secondary waves; the second fastest waves; the move across the direction in which the p-waves are traveling. move up or down or side to side |
| Surface waves | travel along earths surface some shake ground side to side; others roll like waves; both cause most damage to buildings during earthquakes |
| Seismograph | an instrument that detects earthquake waves |
| richer scale | uses sizes of waves on the seismograph to determine how strong an earthquake is |
| moment magnitude | uses seismograph to determine the magnitude of earthquake waves to estimate earthquakes energy more accurate |
| Tsunami | large waves or giant wall of water caused by earthquake's on the ocean floor |
| Mercalli intensity scale | a seismic scale used for measuring the intensity of an earthquake. |
Created by:
Cutepug44
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