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Name: Tony
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How does Ricther Scale relate to logarithm?

The Richter Scale is a common logarithmic scale, which means that each unit on the Richter scale represents a tenfold increase in energy released during the earthquake. So, an earthquake rating a 7 on the Richter scale releases 10 times more energy than one rating a 6, and 100 times more than one rating a 5.

Richard E. Barrans Jr., Ph.D.
Assistant Director
PG Research Foundation, Darien, Illinois

The Richter Scale uses the amplitude of ground motion as a way of ranking the earthquakes in terms of their magnitude, M. The magnitude of an earthquake may be related to its frequency of ocurrence per year via the following relation: log N = k. bM where N is the frequency, M is the magnitude and k and b are constants. Log N is the value of the logarithm function for N.

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