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BeckerFraserPhotos February 2012 photograph 0091

Images, UC QuakeStudies

A photograph of a garage which has sunk into liquefaction on one side. The photograph is captioned by BeckerFraserPhotos, "New Brighton Road".

WEMO ERT Set 1 - March 2011 - Photograph 80

Images, UC QuakeStudies

A photograph of several earthquake-damaged houses on Chester Street East. A pile of liquefaction silt is on the footpath in the foreground.

Natalie Kerschner WEMO Photograph 091

Images, UC QuakeStudies

A photograph of a hole in the footpath outside St Paul's Church where liquefaction has forced its way up.

22 February Earthquake - Photograph 52

Part of the forecourt at the Shell Shirley petrol station has lifted above the rest, after the underground petrol tanks were pushed upwards by liquefaction. Liquefaction silt covers the lower part of the forecourt.

BeckerFraserPhotos February 2012 photograph 0097

Images, UC QuakeStudies

A photograph of a garage which has sunk into liquefaction on one side. The photograph is captioned by BeckerFraserPhotos, "New Brighton Road".

BeckerFraserPhotos February 2012 photograph 0145

Images, UC QuakeStudies

A photograph captioned by BeckerFraserPhotos, "The rear of 14 Waygreen Avenue showing liquefaction nearly a metre deep around the clothes line".

BeckerFraserPhotos February 2012 photograph 0146

Images, UC QuakeStudies

A photograph captioned by BeckerFraserPhotos, "The rear of 14 Waygreen Avenue showing liquefaction nearly a metre deep around the clothes line".

BeckerFraserPhotos December 2011 photograph 2273

Images, UC QuakeStudies

A photograph captioned by BeckerFraserPhotos, "Road cones mark two mounds of liquefaction at Liggins Street in the Horseshoe Lake area".

BeckerFraserPhotos December 2011 photograph 2299

Images, UC QuakeStudies

A photograph of a damaged residential property at Seabreeze Close in Bexley. The yard is covered with weeds and silt from liquefaction.

Geophysical imaging of subsurface earthquake-induced liquefaction features…

Research papers, University of Canterbury Library

On February 22, 2011, a magnitude Mw 6.2 earthquake affected the Canterbury region, New Zealand, resulting in many fatalities. Liquefaction occurred across many areas, visible on the surface as ‘‘sand volcanoes’’, blisters and subsidence, causing significant damage to buildings, land and infrastructure. Liquefaction occurred at a number of sites across the Christchurch Boys High School sports grounds; one area in particular contained a piston ground failure and an adjacent silt volcano. Here, as part of a class project, we apply near-surface geophysics to image these two liquefaction features and determine whether they share a subsurface connection. Hand auger results enable correlation of the geophysical responses with the subsurface stratigraphy. The survey results suggest that there is a subsurface link, likely via a paleo-stream channel. The anomalous responses of the horizontal loop electromagnetic survey and electrical resistivity imaging highlight the disruption of the subsurface electrical properties beneath and between the two liquefaction features. The vertical magnetic gradient may also show a subtle anomalous response in this area, however the results are inconclusive. The ground penetrating radar survey shows disruption of the subsurface stratigraphy beneath the liquefaction features, in particular sediment mounding beneath the silt ejection (‘‘silt volcano’’) and stratigraphic disruption beneath the piston failure. The results indicate how near-surface geophysics allow the characteristics of liquefaction in the subsurface to be better understood, which could aid remediation work following liquefaction-induced land damage and guide interpretation of geophysical surveys of paleoliquefaction features.

Umut Akguzel Photograph 106

Images, UC QuakeStudies

A photograph of police and members of the public people standing near the earthquake damaged Smiths City car park after the 22 February 2011 earthquake. Liquefaction covers the right side of the footpath.

BeckerFraserPhotos September 2010 photograph 111

Images, UC QuakeStudies

Corcoron French Lawyers on Williams Street in Kaiapoi. Liquefaction has caused the building to sink on the right side. This is shown by the fence which now sits at an angle.