| Category | Numbers of Causalities per District (Killed + Injured) | Value |
| Insignificant | 0 to 10 | 1 |
| Minor | 11 to 50 | 2 |
| Moderate | 51 to 500 | 3 |
| Major | 501 to 5000 | 4 |
| Catastrophic | 5001 to 20,286 | 5 |