Aftershocks have continued to shake the North Island after it was hit by one of its biggest earthquakes in decades, damaging homes and triggering a tsunami warning.
Five moderate aftershocks rumbled away overnight after the magnitude 7.1 quake, each between magnitude 4 and 4.6, with the last one occurring at 5am.
The quake rattled tens of thousands of people throughout the North Island, causing a rude awakening when it hit at 4.37am yesterday, about 125km northeast of Te Araroa on the East Cape, at a depth of 22km.
Civil Defence will be reviewing their processes after there was criticism of their warning and alert systems. The Ministry of Civil Defence and Emergency Management sent out its first quake advisory 40 minutes after it hit.
A potential tsunami threat notice was not issued until 5.33am, and a request for an emergency announcement to be broadcast was made at 5.58am.
There were more than 140 aftershocks. Several have been moderate in size, including a 5.6 magnitude jolt at 5.01am and a 4.6 two minutes later. Aftershocks between magnitude 5 and 6 continued.
The Gisborne region continued to shake overnight with several quakes around Te Araroa ranging from magnitude 2.5 to 3.9.
Wellington residents were also jolted awake by a magnitude 4 quake around 2.45am.
Anton McKay, who lives in Patutahi, 15 minutes from Gisborne, was in cleanup mode following the quake.
"There's big cracks in the ceiling beams, about 40cm long. There's also cracks in the walls and the water tanks are hammered.
"The tanks have got cracks in the top and bottom, and they're both leaking water. They'll need to be replaced.
He said he felt everything cracking during the quake. "The kitchen's warped. The cupboards and drawers are buckled, and heaps of the glasses and plates are smashed.
"The swimming pool was sloshing water. It was going about 30cm high and landing in the carport, about 10 metres from the pool."
McKay's teenaged children stayed home from school but the family was going to clean up what it could and intended to stay at the house overnight.
An Insurance Council New Zealand spokeswoman said no significant damage had been reported.
Te Araroa resident Amohi Cook said she and several other residents had huddled in their vehicles on hills above the township.
"I woke up about 4.28am, looked at the clock and the house was rocking.
"It was one of the freakiest ones I've ever felt. The local [Department of Conservation] man called up my husband, who is the chief of the Te Araroa fire brigade, and he went and set the alarms off three times to get everyone up."
Tairawhiti Emergency Management Group is discouraging people from going out in boats. They also suggest staying off beaches, out of the water and away from rivers, streams and estuaries for at least 24 hours.
Key times
4.37am - earthquake strikes
4.41am - Ministry of Civil Defence and Emergency Management told by GNS Science of a magnitude 6.3 earthquake