New Zealand's second largest city Christchurch was shaken by a magnitude 5.2 earthquake on Friday, but there were no immediate reports of damage or casualties.
The government seismology agency said the quake was centred 10 kilometres east of the city at a depth of 11 kilometres.
The city was devastated by a force 6.3 quake in February 2011, killing nearly 200 people, and destroying the central business district and making large areas of surrounding suburbs uninhabitable.
Media reported residents in some areas rushed into the streets, but there no reports of damage or any injuries.
The city has been hit by thousands of aftershocks since the quakein 2011.