Magnitude - Average Annually
8 and higher - 1
7-7.9 - 17
6 - 6.9 - 134
5-5.9 - 1319
4-4.9 - 13,000
3-3.9 - 130,000
2-2.9 - 1,300,000
Source: U.S. Geological Survey
Frequency of Earthquakes
Number of Earthquakes Per Magnitude Each Year Worldwide
By Matt Rosenberg, About.com
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