A photograph of a beam removed from the roof of the Cranmer Centre and placed on the ground in front.
A photograph of the beams removed from the roof of the Cranmer Centre and placed on the ground in front.
A photograph of the beams removed from the roof of the Cranmer Centre and placed on the ground in front.
A photograph of the beams removed from the roof of the Cranmer Centre and placed on the ground in front.
Photograph captioned by Fairfax, "Halswell School Principal Bruce Topham looks at liquefaction on the school ground after the latest quake".
A photograph of the beams removed from the roof of the Cranmer Centre and placed on the ground in front.
A large crack in the ground at Sullivan Park in Avonside which has resulted from the 4 September 2010 earthquake.
Photograph captioned by BeckerFraserPhotos, "The stairs from the Forsyth Barr building on the ground behind 750 Colombo Street".
The courtyard inside the Peterborough Apartments. The ground has subsided under a section of the lawn, causing it to drop.
A photograph of a panel removed from the roof of the Cranmer Centre and placed on the ground in front.
During the 2011 M7.8 Kaikōura earthquake, ground motions recorded near the epicentre showed a significant spatial variation. The Te Mara farm (WTMC) station, the nearest to the epicentre, recorded 1g and 2.7g of horizontal and vertical peak ground accelerations (PGA), respectively. The nearby Waiu Gorge (WIGC) station recorded a horizontal PGA of 0.8g. Interestingly, however, the Culverden Airlie Farm (CULC) station that was very closely located to WIGC recorded a horizontal PGA of only 0.25g. This poster demonstrates how the local geological condition could have contributed to the spatially variable ground motions observed in the North Canterbury, based on the results of recently conducted geophysical investigations. The surficial geology of this area is dominated by alluvial gravel deposits with traces of silt. A borehole log showed that the thickness of the sediments at WTMC is over 76 metres. Interestingly, the shear wave velocity (Vs) profiles obtained from the three strong motion sites suggest unusually high shear wave velocity of the gravelly sediments. The velocity of sediments and the lack of clear peaks in the horizontal-to-vertical (H/V) spectral ratio at WTMC suggest that the large ground motion observed at this station was likely caused by the proximity of the station to the causative fault itself; the site effect was likely insignificant. Comparisons of H/V spectral ratios and Vs profiles suggest that the sediment thickness is much smaller at WIGC compared with CULC; the high PGA at WIGC was likely influenced by the high-frequency amplification caused by the response of shallow sediments.
Photograph captioned by BeckerFraserPhotos, "The entire north side of Tuam Street from High Street to Madras Street which is now clear ground".
A photograph of University of Canterbury Geology students Zach Whitman and Dewiyani Bealing using ground penetrating radar equipment to survey land on the Greendale fault line.
The Prime Minister, has promised people in Canterbury they will know next Wednesday whether they can rebuild on ground badly damaged by this month's earthquake.
A photograph of paving stones lying loose on the ground. The photograph is captioned by BeckerFraserPhotos, "Hereford Street, near the Hanafins Building".
Cordon fencing around the damaged Ground Culinary Centre and cafe. Bricks have crumbled from the walls and remain piled up on the footpath.
A photograph captioned by BeckerFraserPhotos, "The swimming pool has lifted completely out of the ground at 1 Azalea Place, Kaiapoi".
A photograph of a large crack in the pavement of Gayhurst road revealing that the ground has subsided under the tarmac.
The Rolleston Avenue side of the Arts Centre, cordoned off. The turret from one of the towers is on the ground to prevent further damage.
Photograph captioned by BeckerFraserPhotos, "The entire north side of Tuam Street from High Street to Madras Street which is now clear ground".
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The tower on the Great Hall at the Arts Centre has recently been lowered to the ground for safety - and decorated for Christmas. It must be the most unusual Christmas tree ever.
Recent earthquakes have shown that liquefaction and associated ground deformations are major geotechnical hazards to civil engineering infrastructures, such as pipelines. In particular, sewer pipes have been damaged in many areas in Christchurch as a result of liquefaction-induced lateral spreading near waterways and ground oscillation induced by seismic shaking. In this paper, the addition of a flexible AM liner as a potential countermeasure to increase sewer pipe capacity was investigated. Physical testing through 4-point loading test was undertaken to characterise material properties and the response of both unlined pipe and its lined counterpart. Next, numerical models were created using SAP2000 and ABAQUS to analyse buried pipeline response to transverse permanent ground displacement and to quantify, over a range of pipe segment lengths and soil parameters, the effectiveness of the AM liner in increasing displacement capacity. The numerical results suggest that the addition of the AM liner increases the deformation capacity of the unlined sewer pipe by as much as 50 times. The results confirmed that AM liner is an effective countermeasure for sewer pipes in liquefied ground not only in terms of increased deformation capacity but also the fact that AM-Liner can prevent influx of sand and water through broken pipes, making sewer pipes with liner remaining serviceable even under severe liquefaction condition.
Having a quick but reliable insight into the likelihood of damage to bridges immediately after an earthquake is an important concern especially in the earthquake prone countries such as New Zealand for ensuring emergency transportation network operations. A set of primary indicators necessary to perform damage likelihood assessment are ground motion parameters such as peak ground acceleration (PGA) at each bridge site. Organizations, such as GNS in New Zealand, record these parameters using distributed arrays of sensors. The challenge is that those sensors are not installed at, or close to, bridge sites and so bridge site specific data are not readily available. This study proposes a method to predict ground motion parameters for each bridge site based on remote seismic array recordings. Because of the existing abundant source of data related to two recent strong earthquakes that occurred in 2010 and 2011 and their aftershocks, the city of Christchurch is considered to develop and examine the method. Artificial neural networks have been considered for this research. Accelerations recorded by the GeoNet seismic array were considered to develop a functional relationship enabling the prediction of PGAs. http://www.nzsee.org.nz/db/2013/Posters.htm
PDF slides of a presentation given by Dr. Thomas Wilson from the UC Geology department in November 2010. The presentation was delivered at a GeoNZ conference in Auckland.
This study investigates the uncertainty of simulated earthquake ground motions for smallmagnitude events (Mw 3.5 – 5) in Canterbury, New Zealand. 148 events were simulated with specified uncertainties in: event magnitude, hypocentre location, focal mechanism, high frequency rupture velocity, Brune stress parameter, the site 30-m time-averaged shear wave velocity (Vs30), anelastic attenuation (Q) and high frequency path duration. In order to capture these uncertainties, 25 realisations for each event were generated using the Graves and Pitarka (2015) hybrid broadband simulation approach. Monte-Carlo realisations were drawn from distributions for each uncertainty, to generate a suite of simulation realisations for each event and site. The fit of the multiple simulation realisations to observations were assessed using linear mixed effects regression to generate the systematic source, path and site effects components across all ground motion intensity measure residuals. Findings show that additional uncertainties are required in each of the three source, path, and site components, however the level of output uncertainty is promising considering the input uncertainties included.
A house in Pacific Park (Bexley) that borders the Bexley Wetlands. Land moved towards the wetlands and the closer to wetlands the more severe the damage.
A photograph of detail of a piece of masonry removed from the Cranmer Centre and placed on the ground in front.
A photograph of detail of a piece of masonry removed from the Cranmer Centre and placed on the ground in front.
A photograph of a building's roof lying on the ground, captioned by BeckerFraserPhotos, "A collapsed building on Ash Street".