Earlier today police said his truck's last known location was around 30km south of Kaikoura.
"Communications in the area are very difficult but Police have the details of the truck and are keeping watch for it," a spokeswoman said.
Earlier Newshub reported the man was last seen headed north on the road along the coast some ten minutes before the quake struck - and has not been heard from since.
Rangi Dellaway told Newshub Civil Defence had been notified - but searchers hadn't found the man yet.
"You don't know if he's parked up or at someone's house, but we need a call. It would be good to hear from him," he was reported saying.
Dellaway had feared the worst as he said it wasn't the first time the piece of road had given away.