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Earthquake Facts and Statistics
Frequency of Occurrence of Earthquakes
Descriptor Magnitude – Average Annually
Great 8 and higher 1
Major 7 – 7.9 17
Strong 6 – 6.9 134
Moderate 5 – 5.9 1319
(The following are estimated)
Light 4 – 4.9 13,000
Minor 3 – 3.9 130,000
Very Minor 2 – 2.9 1,300,000
Source: U.S. Geological Survey
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