This earthquake followed the magnitude 6.5 Cook Strait earthquake on 21st July. It caused damage to buildings on both sides of Cook Strait.
| When | Fri Aug 16 2013 2:31 PM |
| Where | 5 km south-east of Seddon |
| Shaking | Extreme |
| Magnitude | 6.5 |
| Depth | 7 km |
| Quality | best |
| Extreme | 16 | |
| Severe | 26 | |
| Strong | 185 | |
| Moderate | 812 | |
| Light | 4353 | |
| Weak | 786 | |
| Total | 6178 |
| When | Fri Aug 16 2013 2:31 PM |
| Where | 5 km south-east of Seddon |
| Shaking | Extreme |
| Magnitude | 6.5 |
| Depth | 7 km |
| Quality | best |
| Extreme | 16 | |
| Severe | 26 | |
| Strong | 185 | |
| Moderate | 812 | |
| Light | 4353 | |
| Weak | 786 | |
| Total | 6178 |