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Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The public talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The public talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of a crowd gathered on the corner of St Asaph Street and Madras Street for a public talk about ArtBox gallery by Andrew Just and Martin Trusttum. The public talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of Andrew Just from F3 Design (left) and Martin Trusttum, CPIT Faculty of Creative Arts, giving a talk about ArtBox on the corner of St Asaph Street and Madras Street. The public talk was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of Martin Trusttum, CPIT Faculty of Creative Arts, giving a talk about ArtBox on the corner of St Asaph Street and Madras Street. The photograph was taken during a public talk about the temporary studio and gallery space. The event was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of Martin Trusttum, CPIT Faculty of Creative Arts, giving a public talk about ArtBox on the corner of St Asaph Street and Madras Street. The photograph was taken during a public talk about the temporary studio and gallery space. The event was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of Andrew Just from F3 Design (left) and Martin Trusttum, CPIT Faculty of Creative Arts, arranging models of the temporary ArtBox gallery on the corner of St Asaph Street and Madras Street. The photograph was taken during a public talk, which was part of FESTA 2012.

Images, UC QuakeStudies

A photograph of Andrew Just from F3 Design (left) and Martin Trusttum, CPIT Faculty of Creative Arts, on the corner of St Asaph Street and Madras Street where the temporary ArtBox gallery is to be constructed. The photograph was taken during a public talk, which was part of FESTA 2012.

Images, UC QuakeStudies

A photograph submitted by Scott Thomas to the QuakeStories website. The description reads, "The picture is of St Martins, a suburb just 2 minutes drive up the street from my place. The photo does not do it justice but this road was like the moon, it used to be flat and it is wet due to burst pipes. Photo taken shortly after the 22 Feb 2011 earthquake".

Images, UC QuakeStudies

A photograph of Andrew Just from F3 Design (left), Jessica Halliday, Director of FESTA, and Martin Trusttum, CPIT Faculty of Creative Arts, on the corner of St Asaph Street and Madras Street where the temporary ArtBox gallery is to be constructed. The photograph was taken during a public talk about the temporary studio and gallery space. The event was part of FESTA 2012.

Videos, UC QuakeStudies

A video of an interview with Mayor Bob Parker, recorded at the Civil Defence Headquarters in the Christchurch Art Gallery on the evening of the 22 February 2011. Parker talks about the fatalities and damage caused by the 22 February 2011 earthquake.

Research papers, University of Canterbury Library

Spatial variations in river facies exerted a strong influence on the distribution of liquefaction features observed in Christchurch during the 2010-11 Canterbury Earthquake Sequence (CES). Liquefaction and liquefaction-induced ground deformation was primarily concentrated near modern waterways and areas underlain by Holocene fluvial deposits with shallow water tables (< 1 to 2 m). In southern Christchurch, spatial variations of liquefaction and subsidence were documented in the suburbs within inner meander loops of the Heathcote River. Newly acquired geospatial data, geotechnical reports and eye-witness discussions are compiled to provide a detailed account of the surficial effects of CES liquefaction and ground deformation adjacent to the Heathcote River. LiDAR data and aerial photography are used to produce a new series of original figures which reveal the locations of recurrent liquefaction and subsidence. To investigate why variable liquefaction patterns occurred, the distribution of surface ejecta and associated ground damage is compared with near-surface sedimentologic, topographic, and geomorphic variability to seek relationships between the near-surface properties and observed ground damages. The most severe liquefaction was concentrated within a topographic low in the suburb of St Martins, an inner meander loop of the Heathcote River, with liquefaction only minor or absent in the surrounding areas. Subsurface investigations at two sites in St Martins enable documentation of fluvial stratigraphy, the expressions of liquefaction, and identification of pre-CES liquefaction features. Excavation to water table depths (~1.5 m below the surface) across sand boils reveals multiple generations of CES liquefaction dikes and sills that cross-cut Holocene fluvial and anthropogenic stratigraphy. Based on in situ geotechnical tests (CPT) indicating sediment with a factor of safety < 1, the majority of surface ejecta was sourced from well-sorted fine to medium sand at < 5 m depth, with the most damaging liquefaction corresponding with the location of a low-lying sandy paleochannel, a remnant river channel from the Holocene migration of the meander in St Martins. In the adjacent suburb of Beckenham, where migration of the Heathcote River has been laterally confined by topography associated with the volcanic lithologies of Banks Peninsula, severe liquefaction was absent with only minor sand boils occurring closest to the modern river channel. Auger sampling across the suburb revealed thick (>1 m) clay-rich overbank and back swamp sediments that produced a stratigraphy which likely confined the units susceptible to liquefaction and prevented widespread ejection of liquefied material. This analysis suggests river migration promotes the formation and preservation of fluvial deposits prone to liquefaction. Trenching revealed the strongest CES earthquakes with large vertical accelerations favoured sill formation and severe subsidence at highly susceptible locations corresponding with an abandoned channel. Less vulnerable sites containing deeper and thinner sand bodies only liquefied in the strongest and most proximal earthquakes forming minor localised liquefaction features. Liquefaction was less prominent and severe subsidence was absent where lateral confinement of a Heathcote meander has promoted the formation of fluvial stratum resistant to liquefaction. Correlating CES liquefaction with geomorphic interpretations of Christchurch’s Heathcote River highlights methods in which the performance of liquefaction susceptibility models can be improved. These include developing a reliable proxy for estimating soil conditions in meandering fluvial systems by interpreting the geology and geomorphology, derived from LiDAR data and modern river morphology, to improve the methods of accounting for the susceptibility of an area. Combining geomorphic interpretations with geotechnical data can be applied elsewhere to identify regional liquefaction susceptibilities, improve existing liquefaction susceptibility datasets, and predict future earthquake damage.