Track the aftershocks rattling Christchurch in the wake of the shallow magnitude 6.3 earthquake.

IAG, the ASX-listed insurer that owns State Insurance and NZI, says the latest earthquake will cost it up to A$40 million.

Information about what's been damaged in the aftermath of the magnitude 6.3 earthquake and where people can get help.

KEY

Blue markers: Damage to infrastructure and buildings

Red markers: Closures and restricted areas

Yellow markers: Triage centre and welfare centre locations

Green markers: Water supplies and other services for residents

Purple markers: Operational ATMs and petrol stations

Pink markers: Supermarkets and schools that are open

Rescuers have recovered and identified 55 bodies and are yet to identify a further 20 bodies from yesterday's earthquake in Christchurch.

The Government has declared a national state of emergency after yesterday's 6.3 magnitude earthquake in Christchurch.

The New Zealand Defence Force aide NZ Police in affected areas around Christchurch.

Christchurch Mayor Bob Parker says emergency cash grants will be made available for victims of yesterday's quake.

Compare photos of some of Christchurch's hardest hit buildings from before and after the earthquake.

Cabinet will hold an emergency meeting at 9.30am to decide whether to declare a national state of emergency, Prime Minister John Key says.

The Crusaders have suffered personal loss as a result of the Christchurch earthquake.

Rescue workers are having to leave bodies in the streets of Christchurch as they focus on trying to save survivors of yesterday's devastating 6.3 magnitude earthquake.

The city remains in ruins as rescue workers search through the night for survivors of the Christchurch earthquake.

The official death toll from yesterday's earthquake in Christchurch has been revised to 38, but there are fears it could reach as high as 300 as rescuers uncover more bodies in the rubble.

Between the giant rubble littering the rain-drenched Colombo St, police pull another dead body and lay it down on a black tarpaulin.

Five World Cup games and two quarterfinals scheduled for Christchurch are in jeopardy after yesterday's big quake.

Much of Christchurch is without essential services after yesterday's earthquake with gas, power, water and phone infrastructure all affected.

Prime Minister John Key flew into Christchurch to what he says were scenes from a horror movie.

When the shaking begins, my first thought is "it's just another aftershock". There have been plenty in Christchurch since the big quake.

Statistics New Zealand has stopped the delivery of census forms in Christchurch and Banks Peninsula.