This shock was centered near Cape Campbell, but was felt as far away as Hokitika and Taranaki.
| When | Sat Apr 23 1966 6:49 PM |
| Where | 35 km east of Seddon |
| Shaking | Strong |
| Magnitude | 5.8 |
| Depth | 12 km |
| Quality | best |
| Extreme | 2 | |
| Severe | 1 | |
| Strong | 3 | |
| Moderate | 18 | |
| Light | 81 | |
| Weak | 29 | |
| Total | 135 |
| Extreme | 2 | |
| Severe | 1 | |
| Strong | 3 | |
| Moderate | 18 | |
| Light | 81 | |
| Weak | 29 | |
| Total | 135 |