A magnitude 5.0 quake has struck around 10km east of Seddon on Thursday night.
The quake hit just after 9:42pm, centred 11km deep.
It was initially registered as a "moderate" 4.8 earthquake by GeoNet but was upgraded to a "strong" 5.0 shortly after.
More than 2300 people have reported feeling moderate to severe shaking, mostly around the centre of the country.
There have been no reports of injuries, according to St John.