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Richter Scale Magnitudes
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| Magnitude | Number Per Year (World) | |
| 2 | Just felt | more than 100,000 |
| 4.5 | Damage begins | several thousand |
| 7 | "Major" | 16 to 18 |
| 8 | "Great" | 1 or 2 |
| 9.5 | Maximum recorded | |
| Some Representative Magnitudes | ||
| Year | Location | Magnitude |
| 1906 | San Francisco | 7.8 |
| 1960 | Chile | 9.5 |
| 1964 | Alaska | 8.6 |
| 1989 | San Francisco | 6.9 |
| 1994 | Northridge, CA | 6.7 |
| 2010 | Haiti | 7.0 |
| 2011 | Japan | 9.0 |