An aftershock measuring magnitude 4.8 has occurred near Christchurch.
It was centred 10km east of Christchurch, at a depth of 10km at 1.44pm on Saturday.
There have been no reports of damage and no power or phone services have been affected.
A number of smaller shocks occurred earlier in the day. They measured magnitude 3.2 at 12.38pm and magnitude 3.3 at 11.01am.
