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Knipp 7G Aidan
Earthquake Facts
17
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
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
Rocks on either side of the fault are moving past each other with much upward and downward movement.
Term
Normal fault
Definition
Rocks on either side of the fault are being pressed against each other.
Term
Reverse fault
Definition
Rocks on either side of the fault get pulled away from each other.
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.
Term
Magnitude
Definition
Measure of the energy released during an earthquake.
Term
Liquefaction
Definition
Occurs when wet soil acts more like liquid during an earthquake.
Term
Seismograph
Definition
Instrument used to register earthquake waves and record the time that each arrived.
Term
Focus
Definition
In an earthquake, the point below Earth's surface where energy is released in the form of seismic waves.
Term
Epicenter
Definition
Point on the Earth's surface directly above an earthquake's focus.
Term
Seismic wave
Definition
Wave generated by an earthquake.
Term
Tsunami
Definition
Seismic wave that begins over an earthquake focus and can be highly destructive when it crashes on shore.
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