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Knipp-7G-Bravin
Earthquake facts
15
Geology
7th Grade
01/07/2013

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Cards

Term
Shear
Definition
shear forces push on rock in opposite horizontal directions
Term
Compression
Definition
A force that compacts rock to form a reverse fault
Term
Tension
Definition
rock above the normal fault surface moves downward in relation to the rock below the fault surface
Term
Strike-slip fault
Definition
break in rock caused by shear forces where rocks move past each other without much vertical movement
Term
Normal fault
Definition
break in rock caused by tension forces where rock above the fault surface moves down relative to the rock below the fault surface
Term
Reverse fault
Definition
break in rock caused by compression forces where rock above the fault surface moves upward relative to the rock below the fault surface
Term
Fault
Definition
surface along which rocks move when they pass their elastic limit and break.
Term
Earthquake
Definition
vibrations produced when rocks break along a fault surface
Term
Magnitude
Definition
measure of the energy released during an earthquake
Term
Liquifaction
Definition
occurs when wet soil acts more like liquid during an earthquake
Term
seismograph
Definition
instrument used to reister eartquake waves and record the time that each arrived
Term
focus
Definition
in an earthquake, the point below the Earth's surface where energy is released in the form of seismic waves
Term
epicenter
Definition
point on the Earth's surface directly above the Earth's focus
Term
seismic wave
Definition
wave generated by an earthquake
Term
tsunami
Definition
seismic sea wave that begins over an earthquake focus and can be highly destructive when it crashes on shore
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