The most strongly felt and damaging aftershock since Saturday's major earthquake has hit Canterbury this morning.
It has caused fresh damage to buildings and affected power.
The aftershock measured 5.1 on the Richter scale.
At least 10 other tremors were felt overnight.
The state of emergency in Christchurch is likely to remain in place today as authorities warn of more aftershocks to come.
More than 100 aftershocks which have rocked Canterbury since Saturday's destructive 7.1 earthquake. But it's not over yet Civil Defence has issued a warning that an aftershock of six is possible in the next few days.
A website has been set up to help Canterbury residents access services and keep informed in the aftermath of Saturdays major quake. More to come.