The top of the South Island and bottom of the North have been rocked by a series of earthquakes this morning.
The biggest quake struck at 4.13am, measuring a magnitude 4.6, 30km north-east of St Arnaud, an alpine village south of Nelson.
It struck at a depth of 7km.
It was followed shortly by a 4.0 magnitude quake in the same area at 4.51 but with a depth of 21km.
They were measured by Geonet as strong and moderate respectively.
