Christchurch has been rocked by a 4.8 magnitude earthquake on Sunday evening.
It follows a 4.1 magnitude quake four point one quake at 9.35am on Sunday.
The 4.8 quake was centred 20 kilometres east of Christchurch at a depth of eight kilometres and struck at 5.06pm.
The shaking lasted several seconds but so far there have been no reports of damage or injuries.
The chief executive of the electricity lines company, Orion, says there have been no reports of power outages.
Sunday morning's quake measured 4.1 and was centred 20 kilometres west of Christchurch at a depth of 10km.
The regularity and strength of earthquakes has continued to subside since the quakes felt just before Christmas which produced power outages and fresh liquefaction.