The quake hit 10km south-west of the city, shortly before 8am on Thursday.
Jacinda Ardern said the service did not just focus on the technical issues but also the well-being of the claimants.
The 2016 Kaikōura quake put the Wairarapa line under stress, a new study has found.
But for some families, the fight isn't over.
Since the devastating natural disaster, Christchurch has struggled to get back on its feet.
They want the Government to offer grants and compensation instead.
"We need to learn more about these newly mapped offshore faults."
GeoNet's never had so many people report feeling a quake before.
The earthquake struck in Doğanyol in eastern Turkey.