2

I - II

Usually detected only by instruments

3

III

Felt indoors

4

IV - V

Felt by most people; slight damage

5

VI - VII

Felt by all; many frightened and run outdoors; damage minor to moderate

6

VII - VIII

Everybody runs outdoors; damage moderate to major

7

IX - X

Major damage

8+

X - XII

Total and major damage

After Charles F. Richter, 1958, Elementary Seismology.