An earthquake is rated as ‘major’ if its magnitude in Richter Scale is in the range of :
7.0 - 7.9
The Richter scale is logarithmic, so each whole number step means about ten times greater ground motion. Earthquakes are classified by magnitude ranges.
The usual classes are: 4.0-4.9 light, 5.0-5.9 moderate, 6.0-6.9 strong, 7.0-7.9 major, and 8.0 or more great.
So an earthquake is termed major when its magnitude lies between 7.0 and 7.9; such quakes cause serious damage over large areas.
Hence, 7.0 - 7.9.
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