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Research papers, University of Canterbury Library

During 2010 and 2011, a series of major earthquakes caused widespread damage in the city of Christchurch, New Zealand. The magnitude 6.3 quake in February 2011 caused 185 fatalities. In the ensuing months, the government progressively zoned residential land in Christchurch on the basis of its suitability for future occupation (considering damage from these quakes and future earthquake risk). Over 6,000 homes were placed in the ‘red-zone’, meaning that property owners were forced to sell their land to the Crown. This study analysed patterns of residential mobility amongst thirty-one red-zone households from the suburb of Southshore, Christchurch. Drawing on interviews and surveys, the research traced their experience from the zoning announcement until they had moved to a new residence. The research distinguished between short (before the zoning announcement) and long term (post the red zone ‘deadline’) forms of household relocation. The majority of households in the study were highly resistant to short term movement. Amongst those which did relocate before the zoning decision, the desire to maintain a valued social connection with a person outside of the earthquake environment was often an important factor. Some households also moved out of perceived necessity (e.g. due to lack of power or water). In terms of long-term relocation, concepts of affordability and safety were much more highly valued by the sample when purchasing post-quake property. This resulted in a distinct patterning of post-quake housing location choices. Perceived control over the moving process, relationship with government organisations and insurance companies, and time spent in the red-zone before moving all heavily influenced participants’ disaster experience. Contrary to previous studies, households in this study recorded higher levels of subjective well-being after relocating. The study proposed a typology of movers in the Christchurch post-disaster environment. Four mobility behaviours, or types, are identified: the Committed Stayers (CSs), the Environment Re-Creators (ERCs), the Resigned Acceptors (RAs), and the Opportunistic Movers (OMs). The CSs were defined by their immobility rather than their relocation aspirations, whilst the ERCs attempted to recreate or retain aspects of Southshore through their mobility. The RAs expressed a form of apathy towards the post-quake environment, whereas, on the other hand, the OMs moved relative to pre-earthquake plans, or opportunities that arose from the earthquake itself. Possibilities for further research include examining household adaptability to new residential environments and tracking further mobility patterns in the years following relocation from the red- zone.

Images, eqnz.chch.2010

Steel frames are being used to shore the unstable facade of the St John the Baptist Church at Latimer Square while the building is being repaired and strengthened following the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Images, eqnz.chch.2010

Damaged rose window of the St John the Baptist Church at Latimer Square; aftermath of the magnitude 7.1 earthquake that struck Christchurch on Saturday 4 September 2010.

Audio, Radio New Zealand

Pike River Mine will be put up for sale soon, People allowed into another area of Christchurch cordon, Relative, friends of quake lost describe pain of waiting, Doubts swirl around Rugby World Cup in Christchurch and the ongoing questions surrounding the death of a New Zealander and other tourists in Thailand, Earthquake puts unprecedented pressure on Reserve Bank, Sovereign may not be last failure in struggling building sector, Space shuttle Discovery lands safely in Florida.

Audio, Radio New Zealand

It's been a long road to recovery for one of Christchurch's biggest post-quake projects. Eight years after the route connecting Sumner to Lyttleton was blocked off by the earthquakes, the road through Evans Pass will reopen on Friday. Sumner residents will now have a second route into the suburb, as well as a renewed connection to Lyttleton. Sara Templeton is the councillor for Heathcote Ward, which covers Sumner, and speaks to Guyon Espiner.

Audio, Radio New Zealand

Canterbury got a big shock this morning with a long and strong earthquake that sent people running for the nearest door frame. While the region seems to have escaped any major damage, it's left locals thankful it wasn't worse. The quake measured 6.0 on the richter scale and was centred 45 kilometes north of Geraldine. Since then, there have been more than 40 aftershocks. Checkpoint producer Anastasia Hedge has been near the epicentre.

Images, Alexander Turnbull Library

Text reads 'ROCK STAR' and below is an image of a large rock named 'Rocky'. Context - When a 25-tonne boulder crashed through the garage roof of Phil Johnson's home and left it in ruins during the Christchurch earthquake of 22 February he sold it at an online auction for NZ$60,500 (#27,652). Mr Johnson dubbed it "Rocky". The money will be used to help quake victims. Quantity: 2 digital cartoon(s).

Images, Alexander Turnbull Library

Caricature of Mayor Bob Parker dissolving into quakes; below the image is the name 'Christchurch' in very quavery letters. A second version shows Bob Parker without the shakes and without the name 'Christchurch'. Context - Opinion seems to be that Mayor Bob Parker has shown excellent leadership during the earthquakes and aftershocks in Christchurch. The earthquakes were on 4 September and 22 February. Two versions of this cartoon are available Quantity: 2 digital cartoon(s).

Images, Alexander Turnbull Library

The cartoon shows the word 'Christchurch' fractured by earthquake. Text above reads 'The new tear(s)'. A second version has the text in the singular 'The new tear'. Context: In spite of Christchurch's great hopes for a new year without earthquakes, there have been numerous quakes and aftershocks. A wordplay on 'new year' and 'new tear' - that is weeping with fear and dismay. Two versions of this cartoon are available Quantity: 2 digital cartoon(s).

Images, Alexander Turnbull Library

A boy writes a list of items that seem to be for a camping holiday but it turns out that he lives in Christchurch and these items; a tent, a groundsheet, sleeping bags, a gas cooker and lamp and a chemical toilet are what may be needed because of earthquakes. Context: quakes and aftershocks continue unabated over Christmas and into the new year. Colour and black and white versions available Quantity: 2 digital cartoon(s).

Research papers, University of Canterbury Library

The 2015 New Zealand strong-motion database provides a wealth of new strong motion data for engineering applications. An important component of this database is the compilation of new site metadata, describing the soil conditions and site response at GeoNet strong motion stations. We have assessed and compiled four key site parameters for the ~460 GeoNet stations that recorded significant historical ground motions. Parameters include: site classification (NZS1170.5), Vs30, fundamental site period (Tsite) and depth to bedrock (Z1.0, i.e. depth to material with Vs > 1000 m/s). In addition, we have assigned a quality estimate (Quality 1 – 3) to these parameters to provide a qualitative estimate of the uncertainty. New highquality Tsite estimates have largely been obtained from newly available HVSR amplification curves and spectral ratios from inversion of regional strong motion data that has been reconciled with available geological information. Good quality Vs30 estimates, typically in urban centres, have also been incorporated following recent studies. Where site-specific measurements of Vs30 are not available, Vs30 is estimated based on surface geology following national Vs30 maps. New Z1.0 values have been provided from 3D subsurface models for Canterbury and Wellington. This database will be used in efforts to guide development and testing of new and existing ground motion prediction models in New Zealand. In particular, it will allow reexamination of the most important site parameters that control and predict site response in a New Zealand setting. Furthermore, it can be used to provide information about suitable rock reference sites for seismological research, and as a guide to site-specific references in the literature. We discuss compilation of the database, preliminary insights so far, and future directions.

Research papers, University of Canterbury Library

In this paper, we perform hybrid broadband (0-10 Hz) ground motion simulations for the ten most significant events (Mw 4.7-7.1) in the 2010-2011 Canterbury earthquake sequence. Taking advantage of having repeated recordings at same stations, we validate our simulations using both recordings and an empirically-developed ground motion prediction equation (GMPE). The simulation clearly captures the sedimentary basin amplification and the rupture directivity effects. Quantitative comparisons of the simulations with both recordings and the GMPE, as well as analyses of the total residuals (indicating model bias) show that simulations perform better than the empirical GMPE, especially for long period. To scrutinize the ground motion variability, we partitioned the total residuals into different components. The total residual appears to be unbiased, and the use of a 3D velocity structure reduces the long period systematic bias particularly for stations located close to the Banks Peninsula volcanic area.

Images, eqnz.chch.2010

Toppled grain silos on the outskirts of Darfield near the epicentre of the magnitude 7,1 earthquake that struck on Saturday 4 September 2010.

Images, eqnz.chch.2010

Toppled grain silos on the outskirts of Darfield near the epicentre of the magnitude 7,1 earthquake that struck on Saturday 4 September 2010.

Images, eqnz.chch.2010

Toppled grain silos on the outskirts of Darfield near the epicentre of the magnitude 7,1 earthquake that struck on Saturday 4 September 2010.