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Audio, Radio New Zealand

In the two hours following the earthquake, the St John Ambulance service in Christchurch took more than 353 calls. That compares to just 250 calls it usually receives during a standard 24-hour period. St John's Ambulance operations director, Michael Brook, joins us from Christchurch.

Audio, Radio New Zealand

Labour MPs say it's important party sticks to strategy, Man shot dead by police near Napier, Thousands attend Westminister Christchurch memorial, Twickenham packed for Crusaders vs Sharks match, Doubt in Christchurch new earthquake agency worthwhile, and Canterbury aged care firms want certainty; families want beds.

Images, UC QuakeStudies

A close-up photograph of parts of the Townsend Telescope recovered from the rubble of the Observatory tower. The telescope was housed in the tower at the Christchurch Arts Centre. It was severely damaged when the tower collapsed during the 22 February 2011 earthquake.

Images, UC QuakeStudies

A photograph of parts of the Townsend Telescope recovered from the rubble of the Observatory tower. The telescope was housed in the tower at the Christchurch Arts Centre. It was severely damaged when the tower collapsed during the 22 February 2011 earthquake.

Research papers, University of Canterbury Library

This manuscript provides a critical examination of the ground motions recorded in the near-source region resulting from the 22 February 2011 Christchurch earthquake. Particular attention is given to reconciling the observed spatial distribution of ground motions in terms of physical phenomena related to source, path and site effects. The large number of near-source observed strong ground motions show clear evidence of: forward-directivity, basin generated surface waves, liquefaction and other significant nonlinear site response. The pseudo-acceleration response spectra (SA) amplitudes and significant duration of strong motions agree well with empirical prediction models, except at long vibration periods where the influence of basin-generated surface waves and nonlinear site response are significant and not adequately accounted for in empirical SA models. Pseudo-acceleration response spectra are also compared with those observed in the 4 September 2010 Darfield earthquake and routine design response spectra used in order to emphasise the amplitude of ground shaking and elucidate the importance of local geotechnical characteristics on surface ground motions. The characteristics of the observed vertical component accelerations are shown to be strongly dependent on source-to-site distance and are comparable with those from the 4 September 2010 Darfield earthquake, implying the large amplitudes observed are simply a result of many observations at close distances rather than a peculiar source effect.

Images, eqnz.chch.2010

Photos taken at Gap Filler fair on April 9 following the February 22 earthquake. www.gapfiller.org.nz/ File reference: CCL-2011-04-08-Addington-Gapfiller-003.jpg From the collection of Christchurch City Libraries

Images, eqnz.chch.2010

Photos taken at Gap Filler fair on April 9 following the February 22 earthquake. www.gapfiller.org.nz/ File reference: CCL-2011-04-08-Addington-Gapfiller-005.jpg From the collection of Christchurch City Libraries

Images, eqnz.chch.2010

Photos taken at Gap Filler fair on April 9 following the February 22 earthquake. www.gapfiller.org.nz/ File reference: CCL-2011-04-08-Addington-Gapfiller-007.jpg From the collection of Christchurch City Libraries

Images, eqnz.chch.2010

Photos taken at Gap Filler fair on April 9 following the February 22 earthquake. www.gapfiller.org.nz/ File reference: CCL-2011-04-08-Addington-Gapfiller-002.jpg From the collection of Christchurch City Libraries

Images, eqnz.chch.2010

Photos taken at Gap Filler fair on April 9 following the February 22 earthquake. www.gapfiller.org.nz/ File reference: CCL-2011-04-08-Addington-Gapfiller-004.jpg From the collection of Christchurch City Libraries