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Images, UC QuakeStudies

Members of the USAID Disaster Assistance Response Team (DART) photographed with their team leader, Al Dwyer, Prime Minister John Key, and Canterbury Earthquake Recovery Minister Gerry Brownlee, outside the US headquarters in Latimer Square.

Images, UC QuakeStudies

Shovels and wheelbarrows sitting in Burwood Park near students from the University of Canterbury who are enjoying a barbeque. The students have volunteered to dig up liquefaction as part of the Student Volunteer Army.

Images, UC QuakeStudies

One of the tents set up in the Fine Arts car park at the University of Canterbury, used for teaching while lecture theatres were closed for structural testing. The photographer comments, "Temporary lecture tents".

Images, eqnz.chch.2010

Photos taken in Lyttelton following the February 22 earthquake. Permit authorised by commanding officer HMNZS Canterbury. File ref: CCL-2011-03-05-After-The-Earthquake-P1110452 From the collection of Christchurch City Libraries

Research papers, University of Canterbury Library

1. Background and Objectives This poster presents results from ground motion simulations of small-to-moderate magnitude (3.5≤Mw≤5.0) earthquake events in the Canterbury, New Zealand region using the Graves and Pitarka (2010,2015) methodology. Subsequent investigation of systematic ground motion effects highlights the prediction bias in the simulations which are also benchmarked against empirical ground motion models (e.g. Bradley (2013)). In this study, 144 earthquake ruptures, modelled as point sources, are considered with 1924 quality-assured ground motions recorded across 45 strong motion stations throughout the Canterbury region, as shown in Figure 1. The majority of sources are Mw≥4.0 and have centroid depth (CD) 10km or shallower. Earthquake source descriptions were obtained from the GeoNet New Zealand earthquake catalogue. The ground motion simulations were performed within a computational domain of 140km x 120km x 46km with a finite difference grid spacing of 0.1km. The low-frequency (LF) simulations utilize the 3D Canterbury Velocity Model while the high-frequency (HF) simulations utilize a generic regional 1D velocity model. In the LF simulations, a minimum shear wave velocity of 500m/s is enforced, yielding a maximum frequency of 1.0Hz.

Research papers, The University of Auckland Library

During the Christchurch earthquake of February 2011, several midrise reinforced concrete masonry (RCM) buildings showed performance levels that fall in the range of life safety to near collapse. A case study of one of these buildings, a six-story RCM building deemed to have reached the near collapse performance level, is presented in this paper. The RCM walls on the second floor failed due to toe crushing, reducing the building's lateral resistance in the east–west direction. A three-dimensional (3-D) nonlinear dynamic analysis was conducted to simulate the development of the governing failure mechanism. Analysis results showed that the walls that were damaged were subjected to large compression loads during the earthquake, which caused an increase in their in-plane lateral strength but reduced their ductility capacity. After toe crushing failure, axial instability of the model was prevented by a redistribution of gravity loads. VoR - Version of Record

Research papers, The University of Auckland Library

It is well known that buildings constructed using unreinforced masonry (URM) are susceptible to damage from earthquake induced lateral forces that may result in partial or full building collapse. The 2010/2011 Canterbury earthquakes are the most recent New Zealand example of destructive earthquakes, which have drawn people's attention to the inherent seismic weaknesses of URM buildings and anchored masonry veneer systems in New Zealand. A brief review of the data collected following the 2010 Darfield earthquake and more comprehensive documentation of data that was collected following the 2011 Christchurch earthquake is presented, along with the findings from subsequent data interrogation. Large stocks of earthquake prone vintage URM buildings that remain in New Zealand and in other seismically active parts of the world result in the need for minimally invasive and cost effective seismic retrofit techniques. The principal objective of the doctoral research reported herein was to investigate the applicability of near surface mounted (NSM) carbon fibre reinforced polymer (CFRP) strips as a seismic improvement technique. A comprehensive experimental program consisting of 53 pull tests is presented and is used to assess the accuracy of existing FRP-to-masonry bond models, with a modified model being proposed. The strength characteristics of vintage clay brick URM wall panels from two existing URM buildings was established and used as a benchmark when manufacturing replica clay brick test assemblages. The applicability of using NSM CFRP strips as a retrofitting technique for improving the shear strength and the ductility capacity of multi-leaf URM walls constructed using solid clay brick masonry is investigated by varying CFRP reinforcement ratios. Lastly, an experimental program was undertaken to validate the proposed design methodology for improving the strength capacity of URM walls. The program involved testing full-scale walls in a laboratory setting and testing full-scale walls in-situ in existing vintage URM buildings. Experimental test results illustrated that the NSM CFRP technique is an effective method to seismically strengthen URM buildings.

Research papers, University of Canterbury Library

The Canterbury earthquakes resulted in numerous changes to the waterways of Ōtautahi Christchurch. These included bank destabilisation, liquefaction effects, changes in bed levels, and associated effects on flow regimes and inundation levels. This study set out to determine if these effects had altered the location and pattern of sites utilised by īnanga (Galaxias maculatus) for spawning, which are typically restricted to very specific locations in upper estuarine areas. Extensive surveys were carried out in the Heathcote/Ōpāwaho and Avon/Ōtākaro catchments over the four peak months of the 2015 spawning season. New spawning sites were found in both rivers and analysis against pre-earthquake records identified that other significant changes have occurred. Major changes include the finding of many new spawning sites in the Heathcote/Ōpāwaho catchment. Sites now occur up to 1.5km further downstream than the previously reported limit and include the first records of spawning below the Woolston Cut. Spawning sites in the Avon/Ōtākaro catchment also occur in new locations. In the mainstem, sites now occur both upstream and downstream of all previously reported locations. A concentrated area of spawning was identified in Lake Kate Sheppard at a distinctly different location versus pre-quake records, and no spawning was found on the western shores. Spawning was also recorded for the first time in Anzac Creek, a nearby waterway connected to Lake Kate Sheppard via a series of culverts.

Images, UC QuakeStudies

Mitchell Brown from the USAR National Management Team farewelling the Taiwanese Search and Rescue Team at the Christchurch International Airport. The team is heading home after helping with the emergency response to the Canterbury Earthquake.

Images, UC QuakeStudies

Rob Saunders from the New Zealand Fire Department farewelling the Taiwanese Search and Rescue Team at the Christchurch International Airport. The team is heading home after helping with the emergency response to the Canterbury Earthquake.

Images, UC QuakeStudies

Students from the University of Canterbury heading back to work after enjoying a barbeque lunch in Burwood Park. The students have volunteered to clear liquefaction from Christchurch properties as part of the Student Volunteer Army.

Images, UC QuakeStudies

Students from the University of Canterbury heading back to work after enjoying a barbeque lunch in Burwood Park. The students have volunteered to clear liquefaction from Christchurch properties as part of the Student Volunteer Army.

Images, UC QuakeStudies

Students from the University of Canterbury heading back to work after enjoying a barbeque lunch in Burwood Park. The students have volunteered to clear liquefaction from Christchurch properties as part of the Student Volunteer Army.

Images, UC QuakeStudies

Students from the University of Canterbury heading back to work after enjoying a barbeque lunch in Burwood Park. The students have volunteered to clear liquefaction from Christchurch properties as part of the Student Volunteer Army.

Images, UC QuakeStudies

Students from the University of Canterbury heading back to work after enjoying a barbeque lunch in Burwood Park. The students have volunteered to clear liquefaction from Christchurch properties as part of the Student Volunteer Army.

Images, UC QuakeStudies

Students from the University of Canterbury heading back to work after enjoying a barbeque lunch in Burwood Park. The students have volunteered to clear liquefaction from Christchurch properties as part of the Student Volunteer Army.

Images, UC QuakeStudies

Students from the University of Canterbury heading back to work after enjoying a barbeque lunch in Burwood Park. The students have volunteered to clear liquefaction from Christchurch properties as part of the Student Volunteer Army.

Images, UC QuakeStudies

Students from the University of Canterbury heading back to work after enjoying a barbeque lunch in Burwood Park. The students have volunteered to clear liquefaction from Christchurch properties as part of the Student Volunteer Army.

Images, UC QuakeStudies

University of Canterbury ICT staff members prepare to be escorted to buildings by Civil Defence members in order to retrieve computers from offices. The photographer comments, "ICT staff head out to retrieve computers from buildings".

Images, UC QuakeStudies

Mitchell Brown from the USAR National Management Team farewelling the Taiwanese Search and Rescue Team at the Christchurch International Airport. The team is heading home after helping with the emergency response to the Canterbury Earthquake.

Images, UC QuakeStudies

University of Canterbury students walk along University Drive to get to lectures, after most pathways through campus were cordoned off while buildings were structurally tested. The photographer comments, "Lawns beside University Drive became main walkways".