270 aftershocks rock Canterbury

Damage to the commercial heart of Sydenham, Colombo Street South where buildings have yet to be assessed after the earthquake. Credit: NZPA / David Alexander
Damage to the commercial heart of Sydenham, Colombo Street South where buildings have yet to be assessed after the earthquake. Credit: NZPA / David Alexander
A series of 270 aftershocks have rumbled through Canterbury since the region was shaken by a destructive magitude 7.1 earthquake on Saturday.

GNS seismologist Brian Ferris said people would have felt about 150 of those aftershocks.

About 10 aftershocks were between magnitude 5 and 5.5, 60 between 4 and 4.9 and 200 between 3 and 3.9, he said.

Since midnight there had been 18 aftershocks.

A 5.1 magnitude aftershock that struck shortly before 8am today caused the most alarm in Christchurch since the initial quake, as it was a relatively shallow 6km deep and centred around the city's port area of Lyttelton.

ODT reporter Debbie Porteous said the "short, sharp shock" cut the power in her central city hotel room and knocked over glasses and cups.

"We ran to the doorway to shelter," she said.

The aftershock caused more damage to already weakened buildings and forced another evacuation of the central city.

Christchurch Mayor Bob Parker said the gut-wrenching intensity of the latest quake reduced many emergency workers to tears and led to the evacuation of the Civil Defence offices.

"It was a devastatingly, vicious sharp blow to the city," he told NewstaklkZB.  "This was a terrifying moment. We have just had to evacuate our Civil Defence headquarters.

"We have got staff in tears, we have got fire engines going through the middle of the city, power is out and a lot of people are very, very churned up by that.

"My guts is just churning up here. When will this thing end? It is like living in a maelstrom."

He said that yesterday people's confidence was beginning to return as the gaps between aftershocks lengthened.

"We were restarting to think, maybe, just maybe, we are over the worst of this and now we have had this shocking event.

"This is a hammer blow to the spirit of a lot of people."

He said people would recover but "we have got the most amazing city, the most amazing people who have been through four days of physical and mental hell".

He said today's big shake would cause more serious damage.

As he spoke the city was rocked by another shake, which measured 3.8.

"Oh shit, excuse me. Holy heck... sorry about that," he said.

Mr Parker said assessment teams were heading back into the city to check the damage but emergency workers and civil defence workers were now extremely worried about their own families.

"We are just so jumpy . It doesn't matter how calm you be in these issues, there is still a part of you which wants to tear out the door and head to the hills but that passes quickly," he said.

Mr Parker said hearing the earthquake coming was "like an incoming doodlebug".

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