The VSI is a modified version of the real Volcanic Explosivity Index. This is what separates the soilers from the master soilers
Volcanic Explosivity Index
| Rating | Classification | Plume | Frequency |
|---|---|---|---|
| 1 | non-explosive | Water coverage only | Daily |
| 2 | gentle | Some bowl coverage < 50% outside of water | Daily |
| 3 | explosive | Moderate bowl coverage > 50% outside of water | Weekly |
| 4 | severe | Extreme bowl coverage and minor seat spatter | Monthly |
| 5 | cataclysmic | Moderate seat coverage < 50% | Yearly |
| 6 | paroxysmal | Exteme toilet seat coveage > 50% | 5 Years |
| 7 | colossal | Moderate spatter on tank < 25% | 25 yrs |
| 8 | super-colossal | Spatter on tank > 25% Coverage | 100 yrs |
| 9 | mega-colossal | Spatter onto walls clear of toilet and other items | 10000 yrs |