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Images, UC QuakeStudies

An elaborate graffiti tag sprayed on a wall beside a demolition site on Tuam Street. A collection of abandoned objects lie on the site. The photographer comments, "Graffiti spotted in the Christchurch earthquake red zone. What I liked was the odd mixture of bits and bobs around it".

Images, UC QuakeStudies

Flowers blooming in a vacant site left by the demolition of a building at the corner of Worcester Street and Stanmore Road. A memorial poster made to commemorate Natasha Sarah Hadfield, who died at the site where the Wicks Fish business was located. On it are comments from the public and the word ' We miss you mummy' in big letters.

Research papers, University of Canterbury Library

Pumice materials, which are problematic from an engineering viewpoint, are widespread in the central part of the North Island. Considering the impacts of the 2010-2011 Christchurch earthquakes, a clear understanding of their properties under earthquake loading is necessary. For example, the 1987 Edgecumbe earthquake showed evidence of localised liquefaction of sands of volcanic origin. To elucidate on this, research was undertaken to investigate whether existing empirical field-based methods to evaluate the liquefaction potential of sands, which were originally developed for hard-grained soils, are applicable to crushable pumice-rich deposits. For this purpose, two sites, one in Whakatane and another in Edgecumbe, were selected where the occurrence of liquefaction was reported following the Edgecumbe earthquake. Manifestations of soil liquefaction, such as sand boils and ejected materials, have been reported at both sites. Field tests, including cone penetration tests (CPT), shear-wave velocity profiling, and screw driving sounding (SDS) tests were performed at the sites. Then, considering estimated peak ground accelerations (PGAs) at the sites based on recorded motions and possible range of ground water table locations, liquefaction analysis was conducted at the sites using available empirical approaches. To clarify the results of the analysis, undisturbed soil samples were obtained at both sites to investigate the laboratory-derived cyclic resistance ratios and to compare with the field-estimated values. Research results clearly showed that these pumice-rich soils do not fit existing liquefaction assessment frameworks and alternate methods are necessary to characterise them.