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earthen people shake
ch. 6 vocab
| Question | Answer |
|---|---|
| a large section of earths crust and rigid upper mantle that moves anound the asthenosphere | plate |
| surface along which rocks move when they pass their elastic limit and break | fault |
| instrument used to register earthquake waves and record the time that each arrived | seismograph |
| Break in rock caused by compressive forces where rock above the fault surface moves upward relative to the rock below the fault surface | Reverse fault |
| Vibrations produced when rocks break along a fault | Earthquake |
| break in rock caused by shear forces, where rocks move past each other without much vertical movement | Strike-slip fault |
| break in the rock caused by tension forces, where rock above the fault surface moves down relative to the rock below the fault surface | normal fault |
| Rythmic movement that carries energy through matter and space | wave |
| wave generated by an earthquake | seismic wave |
| seismic wave that moves rock particles up and down in a backwards rolling motion and side to side in a swaying motion | surface wave |
| In an earthquake, the point below earth's surface where energy is released in the form of seismic waves | focus |
| point on earths surface directly above an earthquakes focus | epicenter |
| Seismic wave that moves rock particles back and forth in the same direction the wave travels | primary wave |
| seismic wave that moves rock particles at right angles to the direction of the wave | secondary wave |
| the highest point of a wave | crest |
| measure of the energy released during an earthquake | Magnitude |
| occurs when wet soil acts like liquid during an earthquake | Liquefaction |
| seismic sea wave that begins over an earthquake's focus and can be highly desructive when it crashes on shore | tsunami |