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Breezie's ch 6 vocab
| Question | Answer |
|---|---|
| plate | a large section of earths crust and rigid upper mantle that moves around on the athenosphere. |
| fault | surface along which rocks move when they pass their elastic limit and break. |
| earthquake | vibrations produced when rocks break along a fault. |
| normal fault | break in rocks caused by tension forces, where rock above the fault surface moves down realative to the rock below the fault surface. |
| reverse fault | break in rock caused by compressive forces, where rock above the fault surface moves upward. |
| strick-spil fault | break in rock caused by shear forces, where rocks move past each other without much vertical movement. |
| wave | rythmic movement that carries energy through matter and space. |
| seismic wave | wave generated by an earthquake. |
| focus | in an earthquake, the point below Earth's surface where energy is released in the form of seismic waves. |
| primary wave | seismic wave that moves rock particles back-and-forth in the same direction that the wave travels. |
| secondary wave | seismic wave that moves rock particles at right angles to the direction of the wave. |
| surface wave | seismic wave that moves rock particles up-and-down in a backward rolling motion and side-to-side in a swaying motion. |
| epicenter | point on Earth's surface directly above an earthquake's focus. |
| seismorgraph | instrument used to register earthquake waves and record the time that each arrived. |
| crest | the highest point of a wave. |
| magnitude | measure of the energy released durring an earthquake. |
| liquefaction | occurs when wet soil acts more like a liquid durring an earthquake. |
| tsunami | sesimic sea wave that begins over an earthquake focus and can be highly destructive when it crashes on shore. |