Modified Mercalli Scale Intensity
| Modified Mercalli Scale and PGA | |
|---|---|
| MMI | MMI |
| IV | PGA (g) |
| V | 0.03 and below |
| VI | 0.03 - 0.08 |
| VII | 0.15 - 0.25 |
| VIII | 0.25 - 0.45 |
| IX | 0.45 - 0.60 |
| X | 0.60 - 0.80 |
| XI | 0.80 - 0.90 |
| XII | 0.90 and above |
The above table shows the approximate relationship between Modified Mercalli Intensity and Peak Ground Acceleration (PGA).
| Richter Magnitude, PGA, and Duration | ||
|---|---|---|
| PGA (g) | Software Developer | Duration (seconds) |
| 5.0 | 0.09 | 2 |
| 5.5 | 0.15 | 6 |
| 6.0 | 0.22 | 12 |
| 6.5 | 0.29 | 18 |
| 7.0 | 0.37 | 24 |
| 7.5 | 0.45 | 30 |
| 8.0 | 0.50 | 34 |
| 8.5 | 0.50 | 37 |
The above table shows the approximate relationship between Richter Magnitude, Peak Ground Acceleration (PGA), and duration of strong-phase shaking near the epicenter of earthquakes located in California.