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Videos, UC QuakeStudies

A video of a press conference with Mayor Bob Parker about the 4 September 2010 earthquake. The conference is held outside the temporary Civil Defence headquarters in the Christchurch Art Gallery. Parker announces that he had declared a state of emergency for Christchurch. He also gives advice to residents, telling them to conserve water, avoid flushing the toilets, to not go out and 'rubberneck', and to check on their neighbours.

Research papers, The University of Auckland Library

The majority of current procedures used to deduce liquefaction potential of soils rely on empirical methods. These methods have been proven to work in the past, but these methods are known to overestimate the liquefaction potential in certain regions of Christchurch due to a whole range of factors, and the theoretical basis behind these methods cannot be explained scientifically. Critical state soil mechanics theory was chosen to provide an explanation for the soil's behaviour during the undrained shearing. Soils from two sites in Christchurch were characterised at regular intervals for the critical layers and tested for the critical state lines (CSL). Various models and relationships were then used to predict the CSL and compared with the actual CSL. However none of the methods used managed to predict the CSL accurately, and a separate Christchurch exclusive relationship was proposed. The resultant state parameter values could be obtained from shear-wave velocity plots and were then developed into cyclic resistance ratios (CRR). These were subsequently compared with cyclic stress ratios (CSR) from recent Christchurch earthquakes to obtain the factor of safety. This CSL-based approach was compared with other empirical methods and was shown to yield a favourable relationship with visual observations at the sites' locations following the earthquake.

Images, Alexander Turnbull Library

A ship named 'NZ Ship of State' lies high and dry on rocks; the great jagged holes in her represent 'the recession', 'Pike River', 'Chch 1' and 'Chch 2'. A man standing nearby asks 'How will we refloat her?' and a second man answers '...by cutting Working for Families & interest-free student loans' Someone outside the frame says 'Where's the No. 8 wire?' Context - The New Zealand economy was stagnating before the impact of the Christchurch earthquakes of 4 September 2010 and 22 February 2011 and the Pike River Mine disaster before that. The government was already considering cutting Working for Families & interest-free student loans before the earthquakes struck and it seems that now they are trying to push through these policy changes using the earthquakes as an excuse. Quantity: 1 digital cartoon(s).

Research papers, University of Canterbury Library

The earthquake engineering community is currently grappling with the need to improve the post-earthquake reparability of buildings. As part of this, proposals exist to change design criteria for the serviceability limit state (SLS). This paper reviews options for change and considers how these could impact the expected repair costs for typical New Zealand buildings. The expected annual loss (EAL) is selected as a relevant measure or repair costs and performance because (i) EAL provides information on the performance of a building considering a range of intensity levels, (ii) the insurance industry refers to EAL when setting premiums, and (iii) monetary losses are likely to be correlated with loss of building functionality. The paper argues that because the expected annual loss is affected by building performance over a range of intensity levels, the definition of SLS criteria alone may be insufficient to effectively limit losses. However, it is also explained that losses could be limited effectively if the loadings standard were to set the SLS design intensity considering the potential implications on EAL. It is shown that in order to achieve similar values of EAL in Wellington and Christchurch, the return period intensity for SLS design would need to be higher in Christchurch owing to differences in local hazard conditions. The observations made herein are based on a simplified procedure for EAL estimation and hence future research should aim to verify the findings using a detailed loss assessment approach applied to a broad range of case study buildings.

Research papers, University of Canterbury Library

Gravelly soils’ liquefaction has been documented since early 19th century with however the focus being sand-silts mixture – coarse documentation of this topic, that gravels do in fact liquefy was only acknowledged as an observation. With time, we have been impacted by earthquakes, EQ causing more damage to our property: life and environment-natural and built. In this realm of EQ related-damage the ground or soils in general act as buffer between the epicentre and the structures at a concerned site. Further, in this area, upon the eventual acknowledgement of liquefaction of soils as a problem, massive efforts were undertaken to understand its mechanics, what causes and thereby how to mitigate its ill-effects. Down that lane, gravelly soils’ liquefaction was another milestone covered in early 20th century, and thus regarded as a problematic subject. This being a fairly recent acknowledgement, efforts have initiated in this direction (or area of particle size under consideration-gravels>2mm), with this research outputs intended to complement that research for the betterment of our understanding of what’s happening and how shall we best address it, given the circumstances: socio (life) - environment (structures) - economic (cost or cost-“effectiveness’) and of course political (our “willingness” to want to address the problem). Case histories from at least 29 earthquakes worldwide have indicated that liquefaction can occur in gravelly soils (both in natural deposits and manmade reclamations) inducing large ground deformation and causing severe damage to civil infrastructures. However, the evaluation of the liquefaction resistance of gravelly soils remains to be a major challenge in geotechnical earthquake engineering. To date, laboratory tests aimed at evaluating the liquefaction resistance of gravelly soils are still very limited, as compared to the large body of investigations carried out on assessing the liquefaction resistance of sandy soils. While there is a general agreement that the liquefaction resistance of gravelly soils can be as low as that of clean sands, previous studies suggested that the liquefaction behaviour of gravelly soils is significantly affected by two key factors, namely relative density (Dr) and gravel content (Gc). While it is clear that the liquefaction resistance of gravels increases with the increasing Dr, there are inconclusive and/or contradictory results regarding the effect of Gc on the liquefaction resistance of gravelly soils. Aimed at addressing this important topic, an investigation is being currently carried out by researchers at the University of Canterbury, UC. As a first step, a series of undrained cyclic triaxial tests were conducted on selected sand-gravel mixtures (SGMs), and inter-grain state framework concepts such as the equivalent and skeleton void ratios were used to describe the joint effects of Gc and Dr on the liquefaction resistance of SGMs. Following such experimental effort, this study is aimed at providing new and useful insights, by developing a critical state-based method combined with the inter-grain state framework to uniquely describe the liquefaction resistance of gravelly soils. To do so, a series of monotonic drained triaxial tests will be carried out on selected SGMs. The outcomes of this study, combined with those obtained to date by UC researchers, will greatly contribute to the expansion of a worldwide assessment database, and also towards the development of a reliable liquefaction triggering procedure for characterising the liquefaction potential of gravelly soils, which is of paramount importance not only for the New Zealand context, but worldwide. This will make it possible for practising engineers to identify liquefiable gravelly soils in advance and make sound recommendations to minimise the impact of such hazards on land, and civil infrastructures.

Articles, Christchurch uncovered

…this yard being kept in a disreputable state, there are no cinder pits in proper places to throw the refuse of cooking and things in general, as at home, so old bones, vegetable remains, scrapings of plates, cinders, tea leaves, … Continue reading →

Audio, Radio New Zealand

A lawyer who is suing Southern Response on behalf of earthquake claimants says he was intimidated by private investigators for another government agency in 2013. Southern Response is in charge of settling the outstanding quake claims of former AMI customers in Christchurch, but is now under investigation by the public sector watchdog, the State Services Commission. The Commission is looking at whether standards of integrity and conduct for state servants have been breached in its hiring of security company, Thompson and Clark. Southern Response says it hired the firm in 2014 to assess the level of risk some customers posed to staff. Lawyer Grant Shand tells Guyon Espiner he's waiting to see the results of the inquiry.

Images, Alexander Turnbull Library

The cartoon shows Prince William during his visit to New Zealand following the Christchurch earthquake on 22 February. He is sitting in a deckchair at the beach wearing a jersey with Canterbury colours and a paper hat with 'King of NZ' printed on it; he holds a sausage on a stick in one hand and a can of beer in the other and appears to be enjoying himself mightily. On either side of him is a fern. Quantity: 1 digital cartoon(s).

Images, UC QuakeStudies

A 'sand volcano' of liquefaction silt in Bexley. The photographer comments, "Liquefaction is just a mixture of sand and water squeezed up from the ground, but with a little imagination it has a beauty in its untouched state".

Audio, Radio New Zealand

Hon DAVID CUNLIFFE to the Prime Minister: Does he have confidence that his Ministers are ethical and competent? DAVID BENNETT to the Minister of Finance: What reports has he received on building momentum in the New Zealand economy and how this is supporting jobs? METIRIA TUREI to the Prime Minister: Has he checked his files yet regarding whether Hon John Banks declared a potential conflict of interest in relation to the New Zealand International Convention Centre Bill while still a Minister; if so, was any conflict declared? Hon ANNETTE KING to the Minister of Health: Is he satisfied with the performance of Health Benefits Ltd; if so, why? NICKY WAGNER to the Minister for Canterbury Earthquake Recovery: What recent progress has been made on the anchor projects in the Christchurch Central recovery plan? ANDREW WILLIAMS to the Minister of Conservation: Has he received any reports on the environmental impact of seismic surveying in the New Zealand Exclusive Economic Zone? Hon MARYAN STREET to the Minister of State Services: Has he asked the State Services Commissioner for reports on recent failures of state sector agencies to carry out their functions according to the law; if not, why not? IAN McKELVIE to the Minister for Primary Industries: What progress can he report on boosting innovation in the primary sector through the Primary Growth Partnership? Hon DAMIEN O'CONNOR to the Minister for Primary Industries: What reports, if any, has he received on the state of the New Zealand kiwifruit industry? PAUL FOSTER-BELL to the Minister of Police: What recent announcements has she made to support the victims of serious financial crime? Hon RUTH DYSON to the Minister of Conservation: Why did he tell the House on 24 September "the first I knew of the issue of the submission was just 5 days before" when as he stated on 17 October "The first full briefing on Tukituki was on 5 March and it confirmed the department's role in the process and mentioned nitrogen and phosphorous management"? Dr KENNEDY GRAHAM to the Minister for Climate Change Issues: Will he explain, given the latest projection of New Zealand's net greenhouse gas emissions is around 90 million tonnes in 2040, how the Government can conceivably reach its own emissions reduction target of 30 million tonnes by 2050?

Audio, Radio New Zealand

Southern Response is back in court today - this time having a final go at arguing that a class action against it should not be an 'opt-out'. Christchurch residents Brendan and Colleen Ross say the state insurer deliberately withheld the true cost of repairing their home which was damaged in the Canterbury earthquakes. They are now among 3000 people represented in a class action led by Christchurch lawyer Grant Cameron. In September last year the Court of Appeal decided the class action could proceed on an 'opt-out' basis - which means it would cover more people and potentially cost the state-owned insurer more money if it loses. Southern Response is challenging that decision in the Supreme Court, a two day hearing wrapped up on Tuesday. Checkpoint reporter Logan Church was there.

Audio, Radio New Zealand

The debt stricken state-owned enterprise Solid energy is in crisis talks with the Treasury and its banks, two years after the Christchurch earthquakes, insurance companies are blamed for delays in the rebuild, and in dateline pacific Papua New Guinea is building up its military to build roads.

Audio, Radio New Zealand

The state of emergency in Christchurch has just been extended until midday on Wednesday. In latest developments Canterbury Civil Defence is now warning people to prepare for potential flooding, only two days after the major earthquake that caused widespread damage to much of the region.

Videos, UC QuakeStudies

A video of an interview with Prime Minister John Key about several topical issues. One of these issues is the housing crisis in Christchurch. Key talks about fast tracking the release of land in Christchurch, making sure there are enough resources in the city for building, and working with the Christchurch City Council around consenting. He also talks about the possibility of the National Party winning the Christchurch East by-election.