A magnitude 5.2 earthquake has struck near Levin, just a day after the town was shaken by a previous quake.
Tuesday's earthquake hit at 12:34pm north-west of Levin causing strong shaking in Wellington. According to Geonet it was 33km deep.
All trains in Wellington will run on reduced speeds due to the quake, says Metlink.
Monday's 5.8 quake which struck just before 8am. Both quakes hit in the same area, and at similar depths.
According to Geonet, Tuesday's large quake is the 143rd aftershock from Monday's main 5.8 quake.
"The M5.2 event was reported to have been felt by over 19500 throughout New Zealand and is not out of the ordinary considering the size of the initial event," said the organisation on Twitter.
The original earthquake was felt as far as Dunedin - but it was Prime Minister Jacinda Ardern's reaction that caused a stir across the world.
Ardern was captured on camera reacting to the large quake during a live interview with The AM Show.
Her unflappable demeanour caused an outpouring of support with people across the world congratulating her.