GNS Science says the risk of another big quake hitting Wellington is decreasing.
Seismologist Caroline Holden told Radio New Zealand's Morning Report on Monday there were no big aftershocks overnight - so the prediction has been revised down to a 10% chance of a magnitude 6 and over quake happening over the next 24 hours.
But she said, all the Wellington region is very seismically active, so people should always be prepared for a major event.
Ms Holden said GNS is still monitoring the sequence of quakes very carefully to try to get a better understanding of what is happening.
There have been about three dozen aftershocks since midnight. The biggest was magnitude 4.9 at 3.18am.