A magnitude 5.0 earthquake shook Christchurch in the early hours of this morning.

The Christchurch ambulance service said there were no reports of damage or injury.

Geonet reported the earthquake was centred 10km east of Christchurch, at a depth of 9km.

It was the largest of a series of quakes this morning. Five others also struck, ranging from 3.1 to 3.7 magnitude.