Calls from the public about a mass seal slaughter near Kaikoura are drying up, while the killers remain at large.

The slaughter of 23 seals on the Kaikoura coast last week has prompted debate on whether seals need to be culled in the area.

DOC says it is yet to receive any "concrete" information on who carried out the brutal clubbing to death of 23 fur seals near Kaikoura.

The number of seals which will die as a result of a brutal attack could be many more than the 23 found, a zoologist says.

Twenty-three seals, including eight newborn pups, were found clubbed to death on the Kaikoura coast. DoC believes the seals were attacked over a number of days.

SH1 north of Christchurch remains closed following a major slip near Kaikoura on Friday night.

Experts say the 100m-long slip between two road bridges south of Kaikoura is the biggest in years and could take days to clear.

The NZTA won't know until Monday how long it will take to clear a landslide that has closed State Highway 1 south of Kaikoura and blocked the railway line.

Fonterra says the earthquake has damaged some milking sheds, but all milk has been collected from its Canterbury suppliers.

In the shadow of snow-capped peaks and dark, massive humps, Pamela Wade stands among giants.