A magnitude 5.8 quake centred 20km south east of Tokoroa struck Saturday morning, and it was was felt widely throughout the country.
It was followed by a swarm of smaller tremors.
The larger quake struck at 7.19am. It was 175 kilometres deep and centred 20km south east of Tokoroa.
It was felt particularly in the central North Island and in Wellington, where people reported it as being moderate or strong, GeoNet reported.
It was felt as far north as Kerikeri and as far south as Southland, where it was described as "light".
Nearly 9000 people have reported feeling the quake on the GeoNet website.
The magnitude 5.8 quake was one of 28 quakes, ranging from magnitude 1.2 to 5.8, so far today, according to GeoNet.
Five of those quakes have been centred near Tokoroa.
A 3.7 tremor which struck just four minutes after the 5.8 quake, was also widely felt throughout the North Island. It was centred 15km east of Tokoroa and was 198km deep.
Five more quakes have followed, another magnitude 2.6 quake was centred just north of Tokoroa and a 2.9 quake which struck at 7.31am was 15km south of Tauranga.
Smaller quakes were centred near Whanganui and Murupara.