A magnitude 5.7 earthquake has struck the top of the South Island.
GeoNet reports the quake struck at 10.13pm and was 57 kilometres deep and 10km west of St Arnaud.
Jonathan Hanson from GNS Science told Karyn Hay on Lately there are no reports of damage near the epicentre.
"The estimates that we've seen of the ground shaking in the area don't predict too much damage but potentially some pictures falling off walls or dishes getting a good rattle could be expected."
Social media lit up with comments from rattled residents throughout Nelson and Marlborough.
RNZ's Wellington staff reported a gentle rolling quake that lasted for about 20 seconds.
The prime minister's partner Clarke Gayford was one of those who felt it.
Some Christchurch residents say they felt it very strongly there.