| Zone | Station | Period | Test Z |
| North-east | Ambato | 1966-2013 | 0.951 |
| 1966-1989 | 0.273 | ||
| 1990-2013 | 0.670 | ||
| East | Cevallos | 1966-2013 | 0.969 |
| 1966-1989 | −0.124 | ||
| 1990-2013 | 2.654 | ||
| Tisaleo | 1966-2013 | 1.342 | |
| 1966-1989 | −0.571 | ||
| 1990-2013 | 1.513 | ||
| Center | Pilahuin | 1966-2013 | 1.129 |
| 1966-1989 | 0.174 | ||
| 1990-2013 | 0.322 | ||
| South | Urbina | 1966-2013 | 0.773 |
| 1966-1989 | −0.124 | ||
| 1990-2013 | −0.087 |