Mercalli Intensity Scale
Mercalli Intensity Scale :
An empirical scale for rating the effects of an earthquake, as opposed to its strength (see magnitude [2] above). Mercalli estimates are stated as Roman numerals (I-XII) to avoid confusion with magnitude estimates on the Richter scale. The scale is named for the Italian geologist Giuseppe Mercalli (1850-1914), who devised the first version in 1902; the modified version used in the U.S. and Canada was developed by Charles F. Richter in 1956
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