A 4.2 magnitude aftershock has struck central Canterbury this morning, GNS Science reports.
The quake hit at 9.22am, 10km northeast of Springfield at a depth of 10km.
GNS Science said the quake was felt in central Canterbury, receiving felt reports from Castle Hill Village to Sumner in Christchurch.
The jolt followed a magnitude 2.9 quake at 3.55am, 10km northeast of Christchurch at a depth of 9km.
The North Island also experienced a small jolt this morning.