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Images for silt; more images...

Images, UC QuakeStudies

Dried liquefaction in North New Brighton. The photographer comments, "This shape formed as the liquefaction after the 23 December earthquake in Christchurch started to dry out".

Images, UC QuakeStudies

A view of an empty site that is now covered with weeds and silt from liquefaction. On the site is a digger and two shipping containers. In the background, demolition work on the Manchester Securities House can be seen.

Images, UC QuakeStudies

A view of an empty site that is now covered with weeds and silt from liquefaction. On the site is a digger and two shipping containers. In the background, demolition work on the Manchester Securities House can be seen.

Images, eqnz.chch.2010

Cleaning up Manning Signs of the silt from liquefaction. Three fellow workers man the shovels while two building engineers talk to the boss (hidden). After doing the car park we then turned our hands to the inside of the factory, once clearance was given that we could go inside.

Images, UC QuakeStudies

A van partially submerged in liquefaction. The photographer comments, "A van that unluckily drove into a hole caused by the terrible liquefaction on Beach Road, North New Brighton during the Christchurch earthquake".

Images, UC QuakeStudies

A van partially submerged in liquefaction. The photographer comments, "A van that unluckily drove into a hole caused by the terrible liquefaction on Beach Road, North New Brighton during the Christchurch earthquake".

Images, UC QuakeStudies

Liquefaction and flooding in Waitaki Street, Bexley. The photographer comments, "Waitaki Street a week after the Christchurch Earthquake. Because of the damage to the drains and liquefaction in the area the streets are not drying out".

Images, Alexander Turnbull Library

In a Christchurch street still covered in liquefaction man weeps over his four-wheel drive car, which has a number plate showing the word 'macho'. Two women who are working at clearing the road of silt watch and one of them observes that 'he's not handling the quake well at all... Keeps getting silt smears on the 4 x 4!' Context - The Christchurch earthquake of 22 February 2011. Liquefaction is a particular problem. There is a point being made here about the 'macho' man who sobs over his car and the two staunch women who get on with the cleaning-up effort. Quantity: 1 digital cartoon(s).

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Christchurch Earthquake. University student Sam Johnson organised through Facebook students to go into the suburbs to help residents clean up after Saturday morning's earthquake. They gathered in Halswell to help residents clean up the silt from their properties. James Litchwark shoves dirt".

Images, UC QuakeStudies

Workers use a large water-blasting pipe to clear blocked drains. The photographer comments, "The Australian company Barry Bros Turned up very late at night to clean out our street drains of liquefaction".

Images, UC QuakeStudies

Road damage and liquefaction in a residential street. The photographer comments, "A great gouge in the road caused by liquefaction undermining the road surface and a car driving over it. This was the earthquake in Christchurch, New Zealand on 22 February 2011".

Audio, Radio New Zealand

Billy Kristian of The Invaders shares his memories of Ray Columbus who has died at the age of 74. Islay Marsden of the University of Canterbury discusses what clearing rocks and silt from quake-induced landslides will do to the coastal environment. Kevin Furlong of Penn State University discusses the connection between the earthquakes and various faultline systems.

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Christchurch Earthquake. University student Sam Johnson organised through Facebook students to go into the suburbs to help residents clean up after Saturday morning's earthquake. They gathered in Halswell to help residents clean up the silt from their properties. Celia Mann and Dave White shovel dirt".

Images, UC QuakeStudies

An advertising poster outside Minx Dining Room and Bar on Lichfield Street depicts Katy Perry in a bird cage. The photographer comments, "One of the sites you will see on the Christchurch CBD red zone tour".

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Christchurch Earthquake. University student Sam Johnson organised through Facebook students to go into the suburbs to help residents clean up after Saturday morning's earthquake. They gathered in Halswell to help residents clean up the silt from their properties. James Litchwark (L) and Tom van Laanen shovel dirt".

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.

Images, UC QuakeStudies

Photograph captioned by Fairfax, "Christchurch Earthquake. University student Sam Johnson organised through Facebook students to go into the suburbs to help residents clean up after Saturday morning's earthquake. They gathered in Halswell to help residents clean up the silt from their properties. James Litchwark (L) and James Wigzell shovel dirt from 2A Larsons Road, Halswell".