A series of quakes in excess of magnitude 4 overnight are not cause for concern, GeoNet seismologist John Ristau says.

Three quakes - of magnitude 4, 4.3, then 4.4 - were centred near Seddon in the upper South Island between 10.32pm yesterday and 2.58am today.

More than 100 people, mostly in Wellington, reported feeling the 4.4 quake at 2.58am.

On Monday this week GeoNet forecast there was a 94 per cent chance of one or more earthquakes between magnitudes 4 and 4.9 centred near Seddon.

''This is all quite normal. It's just they happen to be clustered within a few hours,'' Dr Ristau said.

The probability of a magnitude 6-6.9 quake remained at two per cent this morning.

Last night's quakes were around the same location as the 6.6 quake on August 16 that blocked up Wellington as office workers tried to get out of the city.