Looks like kiwi-tv has woken up...
"A magnitude 7.4 earthquake struck about 30km west of Christchurch at 4.35am today, causing minor injuries, structural damage and cutting power.
Police said there have been reports of minor injuries, power to Christchurch was out, sewer lines had been damaged and there had been considerable damage to at least 20 roads, with some impassable, including Sumner Rd.
Structural damage to houses, gas coming out of certain places and broken glass was being reported from throughout Christchurch, while damage and power outages had been reported from as far away as Dunedin.
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noles@tv3.co.nz.
Civil Defence and Emergency Management director John Hamilton said the National Crisis Management Centre has been activated to monitor the situation and co-ordinate central government response if required.
A Timaru resident told NZPA he was awakened by the shaking. His house was groaning and a bedside lamp crashed off its table.
A man who lives in the southern Christchurch coastal suburb of Southshore described the quake as "incredibly long and tortuous".
He was on the second floor of his house and could feel the house "twisting and fracturing around our ears", and it had been left "on a bit of an angle".
There were cracks and a chasm across his garden.
Photographer David Alexander, of suburban Opawa, told NZPA the aftershocks "just keep coming". His house still had power but street lights were out.
Mr Alexander said his wife was from Japan and had experienced worse shocks but she said this was a pretty good one.
Their 103-year-old villa had withstood the onslaught well but there was broken glass and china everywhere, and "a very frightened cat under the bed".
Christchurch man Chris Hutching said the water mains had burst in his St Albans neighbourhood and that "chimneys are down all around us".
Another man said the top of St Joseph's church, in Papanui, appeared to have fallen off.
All Christchurch Hospitals are operational, though people are asked to only come into hospital if it is an emergency.
Christchurch Airport is closed. A spokesman said they are waiting for daylight to assess possible damage. They expect to reopen by 10am.
The Pacific Tsunami Warning Centre said no destructive widespread tsunami threat existed based on historical earthquake and tsunami data. However, earthquakes of this size sometimes generated local tsunamis that could be destructive along coasts located within 100km of the earthquake epicentre, it said.
Civil Defence asked people to assess their home or workplace for damage; look for and extinguish small fires if safe to do so; and not overflow the phone lines with non-emergency calls. They were also asked to check on elderly neighbours."
From the few photos posted, it looks like there's a lot of damage to un-reinforced masonry buildings, which is very common in earthquakes.