List of tsunamis affecting New Zealand
Tsunamis affecting New Zealand are mainly due to the country being part of the geologically active Pacific plate and associated with the Pacific Ring of Fire. Tsunamis affect New Zealand's coastline reasonably frequently and tend to be caused by earthquakes on the Pacific plate both locally and as far away as South America, Japan, and Alaska.
Source: Wikipedia — List of tsunamis affecting New Zealand (CC BY-SA 4.0)