By RNZ
Nearly 5000 people have reported feeling a shallow earthquake centred in Christchurch, at about 11.50pm yesterday.
The Geonet site shows the quake registered at a magnitude of 3.5, but with a depth of just 6km.
Of the 4800 or so 'felt it' reports collected by the website, 11 have described the shaking as 'extreme' - the strongest rating possible.
Three of those were in Nelson, the rest in Christchurch.