5.0-5.9 Moderate Can cause major damage to poorly constructed buildings over small regions. At most slight damage to well-designed buildings. 800 per year

6.0-6.9 Strong Can be destructive in areas up to about 160 kilometres (100 mi) across in populated areas. 120 per year

7.0-7.9 Major Can cause serious damage over larger areas. 18 per year

8.0-8.9 Great Can cause serious damage in areas several hundred miles across. 1 per year

9.0-9.9 Devastating in areas several thousand miles across.
1 per 20 years

10.0+ Epic Never recorded; Extremely rare (Unknown)

(