David Miller is from Christchurch Civil Defence.
Barry Saunders is at the epicentre of the earthquake - Lyttleton.
Labour Party leader Phil Goff is outside the Pyne Gould building - where people are trapped inside.
James Thompson is the Operations Manager for Civil Defence Christchurch.
Bridget Mills is in Latimer Square at a triage centre.
Dave Cliff is the Police Superintendent.
John Townend is a seismologist for GNS; and an Associate Professor at the School of Geography, Environment and Earth Sciences.
Denise Torrey is the principal of Summerfield School in the south of Christchurch.
Radio New Zealand reporter Jessica Maddock has been to a Civil Defense Briefing.
John Carter, Minister for Civil Defence gives reporters in Wellington a briefing.
Head of Canterbury's regional civil defense.
RNZ producer Susan Baldacci reports from Christchurch.
Simon reports from Cashmere.
Frances Adank is in St Albans where there are ruptured pipes and collapsed chimneys.
The Minister of Civil Defence John Carter.
Ian Beale joins us from Mt Pleasant where there has been a rock fall off Castle Rock.
An update on the phone systems from Telecom's communications manager Mark Watts.
Karen Neill is the head of RNZ's Sound Archives.
Jim Mora crosses to reporters in Christchurh to get an update on the 1:00pm aftershock.
Minister for Earthquake Recovery, Gerry Brownlee, responds to Christchurch residents in limbo awaiting a geotech report into which suburbs will be abandoned.
The Christchurch Earthquake Appeal established by the government and spearheaded by NZX Chief Executive Mark Weldon has attracted donor money from companies and individuals around the world. How will that money be spent?
A pdf copy of an account of the earthquakes written in diary form by Nicolas Warren. Note that two images have been redacted from the document because of copyright issues.
It hit 20km south-west of Christchurch.
A concrete block wall with a large diagonal crack running through it. The photographer comments, "This wall has fascinated me. It has cracked across in a dead straight diagonal line during one of Christchurch's many earthquakes. How could this have occurred?".
A digitally manipulated photograph of broken windows on Shadbolt House. The photographer comments, "This was close to the start of the demolition of the earthquake damaged Shadbolt House building in the Port of Lyttelton, New Zealand. In the bright sun the glass reflected the blue sky, but the broken windows only reflected the blackness of the interior of the empty broken building".
A document produced by SPCA Canterbury describing their experiences after the 4 September 2010 earthquake.
The clock tower of the former Railway Station, encased in plywood to prevent further damage. A banner sponsored by The Press hangs below the clock, covered with words which symbolise the September earthquake. The photographer comments, "After the September earthquake the clocked stopped at 04:35 and everyone campaigned to have this clock left as it was. At that time the building was believed to be OK. Two more earthquakes later and the possible memorial will probably end up like a lot of Christchurch's heritage buildings on a huge pile of stone and bricks in Bottle Lake Forest".
The quake was just 7 kilometres deep.
The magnitude 4.0 quake was 15km east of Christchurch.
A magnitude 5.1 earthquake struck Canterbury Monday night. Four thousand people reportedly felt the quake, which was centred 30 kilometres west of Methven. GNS Science seismologist Dr Jonathan Hanson spoke to Ingrid Hipkiss.