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Images, UC QuakeStudies

A CERA information sign on the fence in the Cathedral, placed to provide information to the public about the buildings seen from Cathedral Square. This one says "Regent Theatre: This has been demolished (see bottom left, now vacant site in photograph".

Images, UC QuakeStudies

Looking down Gloucester Street where ongoing demolition and reconstuction work are continuing. Street signs on the road say 'no road marking' and 'truck crossing'. In the background is a Wilson's carpark, converted from a site where a building has been demolished.

Images, UC QuakeStudies

A photograph of workers searching for survivors in the collapsed stores along Manchester Street shortly after the 22 February 2011 earthquake. An excavator can be seen helping to remove rubble from the site.

Images, UC QuakeStudies

The Arts Centre photographed shortly after the 22 February 2011 earthquake. A large crack can be seen in the tower and part of the brickwork around the clock has collapsed onto the pavement below. Scaffolding was placed up against the building after the 4 September 2010 earthquake and the gable was braced with wooden planks. This probably limited the damage to this part of the building. The building has been cordoned off with tape reading, 'Danger keep out'. A sign in front of the door reads, 'Site closed'.

Research papers, The University of Auckland Library

The rapid classification of building damage states or placards after an earthquake is vital for enabling an efficient emergency response and informed decision-making for rehabilitation and recovery purposes. Traditional methods rely heavily on inspector-led on-site surveys, which are often time-consuming, resource-intensive, and susceptible to human error. This study introduces a machine learning-supported surrogate model designed to streamline the assessment of building damage, focusing on the automated assignment of damage placards within the context of New Zealand's post-earthquake evaluation frameworks. The study evaluates two key safety evaluation protocols—Rapid Building Assessment (RBA) and Detailed Damage Evaluation (DDE)—and integrates corresponding databases derived from the 2010–2011 Canterbury Earthquake Sequence (CES) in Christchurch. Six ML classifiers—Multilayer Perceptron (MLP), Random Forest (RF), Support Vector Machine (SVM), K-Nearest Neighbours (KNN), Gradient Boosting Classifier (GBC), and Gradient Bagging (GBag)—were rigorously tested across both databases. The results indicate that the RF-based surrogate model outperforms the other classifiers across both RBA and DDE protocols. Two distinct sets of critical predictors have been further identified for each protocol, allowing for the rapid retrieval of essential data for future on-site surveys, while retaining the RF model's predictive accuracy. The developed surrogate model provides a pragmatic tool for practising engineers to rapidly assign placards to damaged structures and for policymakers and building owners to make informed recovery decisions for earthquake-affected buildings.

Images, eqnz.chch.2010

A crane topples over on Victoria Street while taking glass up to some windows. No one was hurt and the glass never broke. Victoria Street was closed from 7:30am to later in the evening. This all happen on the Knox Plaza building site. Christchurch October 13, 2014 New Zealand.

Images, eqnz.chch.2010

A crane topples over on Victoria Street while taking glass up to some windows. No one was hurt and the glass never broke. Victoria Street was closed from 7:30am to later in the evening. This all happen on the Knox Plaza building site. Christchurch October 13, 2014 New Zealand.

Images, UC QuakeStudies

A photograph of members of the public walking along Gloucester Street near the Colombo Street intersection. In the background, the site of the demolished Farmers Building can be seen as well as the car park to the left.

Images, UC QuakeStudies

View down Papanui Road. Some road works ahead with a sign that says 'Extreme Care Cyclist Merging' and 'Footpath closed please use other side'. On the left is a shop operating out of a shipping container in a site where a building has been demolished.