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Ashley Chapter 6

Earthquakes

QuestionAnswer
Surface along which rocks move when they pass their elastic limit and break. Fault
Vibrations produced when rocks break along a fault. Earthquake
Break in rock caused by tension forces, where rock above the fault surface moves down relative to the rock below the fault surface. Normal Fault
Break in rock cause by compressive forces, where rock above the fault surface moves upward relative to the rock below the fault surface. Reverse Fault
Break in rock caused by shear forces, where rocks move past eachother without much vertical movement Strike-slip Fault
Large sections of earths crust and rigid upper mantle that moves around the asthenosphere. Plate
Wave generated by and earthquake. Seismice wave
In an earthquake, the point below earths surface where energy is released in the form of seismic waves. Focus
seismic waves that move rock particles back-and-forth in the same direction that wave travels. Primary waves
seismic wave that moves rock particles at right angles to the direction of the waves Secondary waves
seismic wave that moves eock particles up-and-down in background rolling motion and side-to-side in a swaying motion Surface wave
point on Earths surface directly above on earthquakes focus epicenter
instrument used to register earthquake waves and record the time that each arrived seismograph
rhythmic movement that carries energy through matter and space wave
highest point of a wave crest
measure ofthe energy released during an earthquake magnitude
occura when wet soils acts more like a liquid during an earthquake liquefaction
ocean waves caused by earthquakes tsunami
Created by: ahatha6790
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