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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 |