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Knipp-7A-Jack Stanley
Earth-Quake Vocab
15
Geology
7th Grade
01/07/2013

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Term
Shear
Definition
The force that causes rocks on either side of a fault to slide past each other
Term
Compression
Definition
the force that squeezes rocks together
Term
Tension
Definition
the force that pulls rocks apart
Term
Strike-slip fault
Definition
when rocks on either side of the fault are moving past each other without much upward or downward movment
Term
Normal fault
Definition
when rock above the fault surface moves downward in relation to rock below the fault surface
Term
Reverse fault
Definition
when rock breaks from force pushing from opposite directions and the rock above the fault surface is forced up
Term
Fault
Definition
surface along which rock moves when they pass their elastic limit and break
Term
Earthquake
Definition
when vibrations are produced by the breaking of rock
Term
Magnitude
Definition
measure of the energy released during an earthquake
Term
Liquifaction
Definition
occurs when wet soil acts more like a liquid during an earthquake
Term
Sesimograph
Definition
Instrment used to register earthquake waves and record the time that each arrived
Term
Focus
Definition
in an earthquake, the point below Earths surface where energy is released in the form of sesmic waves
Term
Epicenter
Definition
point on earths surface directly above an earthquakes focus
Term
Sesmic wave
Definition
wave genertaed by an eathquake
Term
Tsunami
Definition
sesmic wave that begins over an earthquake focus and can be highly destructive when it crashes on shore
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