The Wikipedia page for the earthquake is pretty exhaustive already:
http://en.wikipedia.org/wiki/2010_Chile_earthquake
Also:
http://en.wikipedia.org/wiki/Richter...ter_magnitudes
Quote:
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Because of the logarithmic basis of the scale, each whole number increase in magnitude represents a tenfold increase in measured amplitude; in terms of energy, each whole number increase corresponds to an increase of about 31.6 times the amount of energy released.
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