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15 Cards in this Set
- Front
- Back
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earthquake
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vibrations that occur when rocks break along a fault.
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epicenter
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point on Earth's surface right above an earthquake's surface.
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fault
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surface along which rocks move when they pass their elastic limit and break.
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focus
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in an earthquake, the point below the Earth's surface where energy is released in forms of seismic waves.
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liquef action
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occurs when wet soil acts more like liquid in earthquake.
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magnitude
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measure of energy released during an earthquake.
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normal fault
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break in the rock caused by tension forces.
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primary wave
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seismic wave that moves rock particles back-and-forth.
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reverse fault
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break in rock caused by compresion forces.
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secondary wave
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seismic wavethat moves rock particles at right angles to the directions of the waves.
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seismic wave
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wave generated by an earthquake,
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seismograph
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an instrument used to measure the strength of earthquakes.
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strike-slip fault
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breakin rock caused by shear forces
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surface wave
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seismic wave that moves rock particles up-and-down.
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tsunami
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seismic sea wave that begins over an earthquake
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