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chap. 6 .
fault
| Question | Answer |
|---|---|
| plate | upper mantle that moves around on the athenosphere |
| fault | surface along which rocks move when they pass their elastic limit and break |
| earthquake | vibarations produced when rocks break along a fault |
| normal fault | rock above the fault surfaces moves down relative to the rock below the fault surface |
| reverse fault | break in rock caused by compressive forces, where rock above the fault surface moves upward relative to the rock below the fault surface |
| strike-slip fault | break in rock caused by shear forces, where rocks move past each other without much vertical movement |
| wave | rhythmic movement that carries energy through matter and space |
| seismic wave | wave generated by earthquake |
| focus | the point where this energy release first occurs |
| primary wave | cause particals in rocks to move back and forth in the direction that the wave is traveling |
| secondary wave | cause of particals to move at right angles to the direction of wave travel |
| surface wave | move rock particals in a backward rolling motion |
| epicenter | is the point on earth's surface directly |