A magnitude 5.7 quake has hit near St Arnaud, in the Nelson region.
The quake hit at 1.39pm and was centred 35km southeast of St Arnaud, at a depth of 48km.
It was felt as far north as Otorohanga, in Waikato, and as far south as Waikari, in Otago.
There were no initial reports of damage.
Honestly feel a little sick following that earthquake.. whoa #eqnz— Hayley (@LadyHayley_) February 9, 2016
We felt it here in Greymouth. #eqnz— Teressa (@muerk) February 9, 2016
Little rolling action there #eqnz— Grant Robertson (@grantrobertson1) February 9, 2016
As scary as they are, it's comforting to see everyone's #eqnz tweets because if we're tweeting we're ok. We've not always been so lucky.— Bonjela Lawson (@loumagooo) February 9, 2016
A St John spokesperson said staff had not had any calls relating to the quake.