Why does New Zealand experience frequent earthquakes and volcanic activity?

New Zealand experiences frequent earthquakes and volcanic activity because it is located within the Ring of Fire, a major circum-Pacific seismic belt characterized by intense tectonic movement.1

The country sits across the boundary of two major tectonic plates: the Indian-Australian Plate and the Pacific Plate. The North Island and the western portion of the South Island are situated on the Indian-Australian Plate, while the remainder of the South Island lies on the Pacific Plate.1

The collision and interaction between these plates create violent seismic activity, particularly in subduction zones and along major faults, such as the Alpine Fault. In the North Island, volcanism is a primary tectonic process that shapes the landscape, while the South Island's mountains are largely the result of crustal shortening, folding, and thrust faulting caused by these converging plates. This ongoing geological activity results in numerous earthquakes annually, some of which have been historically devastating.12