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Audio, Radio New Zealand

It's 10 years since an earthquake killed 185 people in Christchurch. Ports of Auckland workers the latest people to be vaccinated against Covid-19. And Papatoetoe High students are back to school following three community Covid cases at the college. Nicola Wright has the news.

Audio, Radio New Zealand

The Tiwai Point Aluminium Smelter has stockpiled a thousand tonnes of hazardous waste near an eroding beach, A court ruling finds inmates at Auckland Women's Prison were treated in a cruel and degrading manner,We speak to some of those affected by the devastating earthquake that struck Christchurch ten years ago today.

Audio, Radio New Zealand

Christchurch residents will gather today to mark the tenth anniversary of the Christchurch Earthquake. The 6.2 magnitude quake killed 185 people and caused widespread destruction across the city. It hit at 12.51pm while many people were in the city centre, working, shopping or enjoying their lunch in the sunshine. This is where our coverage began. A warning this is confronting audio of events that day.

Audio, Radio New Zealand

Just one CTV employee who was in the building during the February 22 earthquake managed to escape before it came down. For Maryanne Jackson, the pain of losing 16 colleagues has been compounded by the lack of accountability following the catastrophic collapse that killed 141 people. She sat down with Checkpoint reporter Nick Truebridge and cameraman Nate McKinnon.

Audio, Radio New Zealand

Today RNZ's Midday supervising producer, Denise Garland, looks at two brand new podcasts. Collapse is a podcast from Stuff, all about the Christchurch earthquakes in the lead up the to 10th anniversary of the devastating quake on February 22nd. She also looks at NZ Wars - Stories of Tainui from RNZ which over the three episodes covers the war of Waikato in the 1860s, the great war for New Zealand, a defining conflict of New Zealand.

Audio, Radio New Zealand

The Aromaunga Baxters Flowers nursery in Heathcote, Christchurch sits right above the point where the earthquake struck on 22 February 2011. The greenhouses on the steep slopes of the Port Hills, as well as a big old villa and other brick buildings were badly damaged. Ten years on co-owner John Baxter says the earthquake damage is still being repaired, but sales have been boosted by a lack of imported flowers due to Covid-19 restrictions.

Audio, Radio New Zealand

Matthew McEachen should have had most of his life ahead of him when he died on February 22, 2011. The 25-year-old was a talented artist and designer, putting his skills to good use at the Southern Ink tattoo shop on Colombo St. But when the earthquake struck, Bruce, Jeanette and Sarah McEachen lost their much-loved son and older brother. Ten years on, Matti's legacy lives on. Checkpoint reporter Nick Truebridge and cameraman Nate McKinnon with his story.

Audio, Radio New Zealand

Thousands of people in Christchurch and around the country paused at 12.51 on Monday afternoon to mark a decade since the February 22 magnitude 6.3 earthquake which claimed 185 lives. It was 10 years ago today when an ordinary Christchurch day turned to hell for so many. But in contrast to the harrowing scenes and sounds of that day, today a large peaceful crowd gathered at the Civic Memorial Service on the banks of the Avon River under large oak trees. Reporter Sally Murphy and cameraman Nate McKinnon were there.

Audio, Radio New Zealand

Cantabrians are still surrounded broken buildings and empty spaces on the 10th anniversary of the devastating 22 February 2011 Christchurch earthquake. The disaster forced 70 percent of the CBD to be demolished. The Government launched an ambitious recovery plan to help it recover in 2012. The Christchurch Central Recovery Plan, dubbed the "blueprint" would dictate the rebuild of the central city. To support it, the Government would complete a series of "anchor projects", to encourage investment in the city and make it a more attractive place to live in. As Anan Zaki reports, the anchor projects appeared to weigh down the progress of the rebuild.

Research papers, The University of Auckland Library

This thesis presents the application of data science techniques, especially machine learning, for the development of seismic damage and loss prediction models for residential buildings. Current post-earthquake building damage evaluation forms are developed for a particular country in mind. The lack of consistency hinders the comparison of building damage between different regions. A new paper form has been developed to address the need for a global universal methodology for post-earthquake building damage assessment. The form was successfully trialled in the street ‘La Morena’ in Mexico City following the 2017 Puebla earthquake. Aside from developing a framework for better input data for performance based earthquake engineering, this project also extended current techniques to derive insights from post-earthquake observations. Machine learning (ML) was applied to seismic damage data of residential buildings in Mexico City following the 2017 Puebla earthquake and in Christchurch following the 2010-2011 Canterbury earthquake sequence (CES). The experience showcased that it is readily possible to develop empirical data only driven models that can successfully identify key damage drivers and hidden underlying correlations without prior engineering knowledge. With adequate maintenance, such models have the potential to be rapidly and easily updated to allow improved damage and loss prediction accuracy and greater ability for models to be generalised. For ML models developed for the key events of the CES, the model trained using data from the 22 February 2011 event generalised the best for loss prediction. This is thought to be because of the large number of instances available for this event and the relatively limited class imbalance between the categories of the target attribute. For the CES, ML highlighted the importance of peak ground acceleration (PGA), building age, building size, liquefaction occurrence, and soil conditions as main factors which affected the losses in residential buildings in Christchurch. ML also highlighted the influence of liquefaction on the buildings losses related to the 22 February 2011 event. Further to the ML model development, the application of post-hoc methodologies was shown to be an effective way to derive insights for ML algorithms that are not intrinsically interpretable. Overall, these provide a basis for the development of ‘greybox’ ML models.

Research papers, The University of Auckland Library

The Manchester Courts building was a heritage building located in central Christchurch (New Zealand) that was damaged in the Mw 7.1 Darfield earthquake on 4 September 2010 and subsequently demolished as a risk reduction exercise. Because the building was heritage listed, the decision to demolish the building resulted in strong objections from heritage supporters who were of the opinion that the building had sufficient residual strength to survive possible aftershock earthquakes. On 22 February 2011 Christchurch was struck by a severe aftershock, leading to the question of whether building demolition had proven to be the correct risk reduction strategy. Finite element analysis was used to undertake a performance-based assessment, validating the accuracy of the model using the damage observed in the building before its collapse. In addition, soil-structure interaction was introduced into the research due to the comparatively low shear wave velocity of the soil. The demolition of a landmark heritage building was a tragedy that Christchurch will never recover from, but the decision was made considering safety, societal, economic and psychological aspects in order to protect the city and its citizens. The analytical results suggest that the Manchester Courts building would have collapsed during the 2011 Christchurch earthquake, and that the collapse of the building would have resulted in significant fatalities.