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Richter magnitude scale

The Richter magnitude test scale (or more correctly local magnitude ML scale) assigns a single number to quantify the size of an earthquake.

It is a base-10 logarithmic scale obtained by calculating the logarithm of the combined horizontal amplitude of the largest displacement from zero on a seismometer output.

Note:   The above text is excerpted from the Wikipedia article "Richter magnitude scale", which has been released under the GNU Free Documentation License.
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October 8, 2015

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