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a numerical scale for expressing the magnitude of an earthquake on the basis of seismograph oscillations. The more destructive earthquakes typically have magnitudes between about 5.5 and 8.9; the scale is logarithmic and a difference of one represents an approximate thirtyfold difference in magnitude.

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a smaller earthquake following the main shock of a large earthquake.

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can be produced by earthquakes

and recorded by seismographs.

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they move through the body of an object

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a type of fault whose relative motion is

predominantly horizontal in either

sinistral or dextral direction.

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the location under the earth's

surface where an

earthquake occurs

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The point on the Earth's surface that

is directly above the hypocenter

or focus, the point where an

earthquake or underground

explosion originates.

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planar fracture or discontinuity in

a volume of rock, across which there

has been significant displacement

along the fractures as a result of earth

movement.

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a sudden and violent shaking of the ground,

sometimes causing great destruction,

as a result of movements

within the earth's crust or volcanic action.