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Research papers, University of Canterbury Library

As a consequence of the 2010 – 2011 Canterbury earthquake sequence, Christchurch experienced widespread liquefaction, vertical settlement and lateral spreading. These geological processes caused extensive damage to both housing and infrastructure, and increased the need for geotechnical investigation substantially. Cone Penetration Testing (CPT) has become the most common method for liquefaction assessment in Christchurch, and issues have been identified with the soil behaviour type, liquefaction potential and vertical settlement estimates, particularly in the north-western suburbs of Christchurch where soils consist mostly of silts, clayey silts and silty clays. The CPT soil behaviour type often appears to over-estimate the fines content within a soil, while the liquefaction potential and vertical settlement are often calculated higher than those measured after the Canterbury earthquake sequence. To investigate these issues, laboratory work was carried out on three adjacent CPT/borehole pairs from the Groynes Park subdivision in northern Christchurch. Boreholes were logged according to NZGS standards, separated into stratigraphic layers, and laboratory tests were conducted on representative samples. Comparison of these results with the CPT soil behaviour types provided valuable information, where 62% of soils on average were specified by the CPT at the Groynes Park subdivision as finer than what was actually present, 20% of soils on average were specified as coarser than what was actually present, and only 18% of soils on average were correctly classified by the CPT. Hence the CPT soil behaviour type is not accurately describing the stratigraphic profile at the Groynes Park subdivision, and it is understood that this is also the case in much of northwest Christchurch where similar soils are found. The computer software CLiq, by GeoLogismiki, uses assessment parameter constants which are able to be adjusted with each CPT file, in an attempt to make each more accurate. These parameter changes can in some cases substantially alter the results for liquefaction analysis. The sensitivity of the overall assessment method, raising and lowering the water table, lowering the soil behaviour type index, Ic, liquefaction cutoff value, the layer detection option, and the weighting factor option, were analysed by comparison with a set of ‘base settings’. The investigation confirmed that liquefaction analysis results can be very sensitive to the parameters selected, and demonstrated the dependency of the soil behaviour type on the soil behaviour type index, as the tested assessment parameters made very little to no changes to the soil behaviour type plots. The soil behaviour type index, Ic, developed by Robertson and Wride (1998) has been used to define a soil’s behaviour type, which is defined according to a set of numerical boundaries. In addition to this, the liquefaction cutoff point is defined as Ic > 2.6, whereby it is assumed that any soils with an Ic value above this will not liquefy due to clay-like tendencies (Robertson and Wride, 1998). The method has been identified in this thesis as being potentially unsuitable for some areas of Christchurch as it was developed for mostly sandy soils. An alternative methodology involving adjustment of the Robertson and Wride (1998) soil behaviour type boundaries is proposed as follows:  Ic < 1.31 – Gravelly sand to dense sand  1.31 < Ic < 1.90 – Sands: clean sand to silty sand  1.90 < Ic < 2.50 – Sand mixtures: silty sand to sandy silt  2.50 < Ic < 3.20 – Silt mixtures: clayey silt to silty clay  3.20 < Ic < 3.60 – Clays: silty clay to clay  Ic > 3.60 – Organics soils: peats. When the soil behaviour type boundary changes were applied to 15 test sites throughout Christchurch, 67% showed an improved change of soil behaviour type, while the remaining 33% remained unchanged, because they consisted almost entirely of sand. Within these boundary changes, the liquefaction cutoff point was moved from Ic > 2.6 to Ic > 2.5 and altered the liquefaction potential and vertical settlement to more realistic ii values. This confirmed that the overall soil behaviour type boundary changes appear to solve both the soil behaviour type issues and reduce the overestimation of liquefaction potential and vertical settlement. This thesis acts as a starting point towards researching the issues discussed. In particular, future work which would be useful includes investigation of the CLiq assessment parameter adjustments, and those which would be most suitable for use in clay-rich soils such as those in Christchurch. In particular consideration of how the water table can be better assessed when perched layers of water exist, with the limitation that only one elevation can be entered into CLiq. Additionally, a useful investigation would be a comparison of the known liquefaction and settlements from the Canterbury earthquake sequence with the liquefaction and settlement potentials calculated in CLiq for equivalent shaking conditions. This would enable the difference between the two to be accurately defined, and a suitable adjustment applied. Finally, inconsistencies between the Laser-Sizer and Hydrometer should be investigated, as the Laser-Sizer under-estimated the fines content by up to one third of the Hydrometer values.

Audio, Radio New Zealand

Six years on from the Christchurch earthquakes, one in five residents of the city say the disaster is still taking its toll. The latest wellbeing survey by the Canterbury DHB found people living in north-east and east Christchurch were the most likely to be suffering from issues such as anxiety, from ongoing aftershocks, being in a damaged environment, and surrounded by construction.

Audio, Radio New Zealand

Tomorrow will mark four years since a huge 7.8 magnitude earthquake rocked North Canterbury. As well as severely damaging homes and roads, it left some hill country farms in the area with up to 40 percent of their land unusable. Four years on, sheep and beef farmers are finding new ways to work. Rural reporter, Maja Burry and cameraman Nate McKinnon have the story.

Videos, UC QuakeStudies

The city centre and Tuahiwi Marae, the home of Ngāi Tūāhuriri, are now linked by names. The Anglican cathedral and Tuahiwi’s church, both called St Stephens, sit on land called Whitireia. Whitireia was the house of Paekia, the ancestor who landed on the North Island on the back of a whale at Tūranga, which is now the name of Christchurch’s city library.

Images, UC QuakeStudies

A photograph looking north across Tuam Street to Poplar Lane. Bricks from earthquake-damaged buildings litter the lane. A car parked on the left side of the lane has been crushed by falling bricks. To the left of the photograph a pile of rubble from Plume is sitting on the road. Behind this are two mannequins, still hanging in the store.

Images, UC QuakeStudies

A photograph looking north up Durham Street from the Gloucester Street intersection. To the left, there is a large pile of rubble from a demolished building, to the right, the Canterbury Provincial Chambers. The Provincial Chambers building has been largely deconstructed and plastic sheeting has been placed over part of the roof. Wire fencing has been placed around the buildings.

Images, UC QuakeStudies

A red sticker on the door of a damaged building in North New Brighton. The photographer comments, "A year after the earthquake in Christchurch a lot of buildings outside of the CBD are covered in cracks and beyond repair. These will slowly be demolished, but until then the buildings will be protected by a movable barrier and a red sticker".

Images, eqnz.chch.2010

20130325_1112_EOS M-25 Water water everywhere! (Day 84/365) While the whole of the North Island is under drought conditions and parts of the South Island likely to follow suit, I doubt it will happen in Christchurch. With hundreds of earthquake road, water and sewer repairs underway many are spilling hundreds of litres of water per minute, like...

Images, UC QuakeStudies

The University of Canterbury's E-Learning team's temporary office in the James Hight building. The photographer comments, "First looks at our new temporary (maybe) office space. Our group will stay here until April or May 2011, then will move to another floor in the Central Library. Common area. More offices run along the north wall at the left. Through the doors are the male toilets and a stair well".

Images, UC QuakeStudies

Damage to TJ's Kazbah in New Brighton. The tower and east end of the building have collapsed onto two parked cars. The photographer comments, "The occupants of the business and rooms all managed to escape alive. A digger was used to make the building safe and then used to sift through the rubble for any surviving belongings. It was a very emotional time for the ex-occupants. The damaged cars were removed before the digger demolished the building".

Research papers, University of Canterbury Library

The south Leader Fault (SLF) is a newly documented active structure that ruptured the surface during the Mw 7.8 Kaikoura earthquake. The Leader Fault is a NNE trending oblique left lateral thrust that links the predominantly right lateral ‘The Humps’ and Conway-Charwell faults. The present research uses LiDAR at 0.5 m resolution and field mapping to determine the factors controlling the surface geometries and kinematics of the south Leader Fault ruptures at the ground surface. The SLF zone is up to 2km wide and comprises a series of echelon NE-striking thrusts linked by near-vertical N-S striking faults. The thrusts are upthrown to the west by up to 1 m and dip 35-45°. Thrust slip surfaces are parallel with Cretaceous-Cenozoic bedding and may reflect flexural slip folding. By contrast, the northerly striking faults dip steeply (65° west- 85° east), and accommodate up to 3m of oblique left lateral displacement at the ground surface and displace Cenozoic bedding. Some of the SLF has been mapped in bedrock, although none were known to be active prior to the earthquake or have a strong topographic expression. The complexity of fault rupture and the width of the fault zone appears to reflect the occurrence of faulting and folding at the ground surface during the earthquake.

Images, UC QuakeStudies

The north-west end of the Arts Centre on the corner of Rolleston Avenue and Worcester Boulevard. The tip of the gable is missing as well as the spire which has been removed and braced on the footpath to limit damage. Wire fencing and road cones have been placed around the building as a cordon. In the distance, a crane is working on the building.

Images, UC QuakeStudies

Detail of a light fitting outside the former Ozone Hotel in North New Brighton. The photographer comments, "The broken light fitting is on the Ozone Hotel, which is red stickered after the 22 February 2011 earthquake in Christchurch. They will need to fix the building before this light gets a new bulb. The distinct blue colour seen is what made the Ozone stand out on Marine Parade".

Images, UC QuakeStudies

Dried liquefaction silt in North New Brighton. The photographer comments, "This is the the top layer of liquefaction that has dried up in the hot sun. A broken eggshell is around 5 times stronger than these, but a fallen leaf is just not enough to break one. You can see underneath that the heavier sandy layer of liquefaction has dried and has cracked as well".

Images, eqnz.chch.2010

20160415_0029_1D3-24 Red Zone Closures The permanent closure (to motor vehicles) of the Bexley red zone streets has started. This was once the main south-north route just west of the Avon River in the New Brighton area, till an expressway (ring road) was built about 80m to the west (right) about 12-13 years ago. Then it became just another ...

Audio, Radio New Zealand

Christchurch is still struggling 10 years on from the earthquake with vacant spaces and little development. In the surrounding areas of Christchurch in Selwyn, inland and in the Waimakariri District to the north it's boom times, with the councils unable to keep up with building consents. The regions have continued to grow over the last 10 years after people initially moved there after the earthquake to escape the bumpy roads, red zones and EQC battles. RNZ's Sally Murphy reports.

Audio, Radio New Zealand

Red Cross aid worker Rosemarie North is in the Banten province of Java where authorities have lifted the alert level for the Anak Krakatau volcano to its second-highest level. She has worked on and off for the Red Cross since 2003 in all kinds of situations, including post-conflict in Sierra Leone, landslides in the Philippines and Papua New Guinea, refugee camps in Chad, earthquakes in Nepal and Christchurch, and tsunamis in Southeast Asia and Samoa. [image_crop:72149:full]

Audio, Radio New Zealand

Canterbury got a big shock this morning with a long and strong earthquake that sent people running for the nearest door frame. While the region seems to have escaped any major damage, it's left locals thankful it wasn't worse. The quake measured 6.0 on the richter scale and was centred 45 kilometes north of Geraldine. Since then, there have been more than 40 aftershocks. Checkpoint producer Anastasia Hedge has been near the epicentre.

Images, Alexander Turnbull Library

Scene set at Santa Claus' 'Online Christmas Orders Dept' at the North Pole. One elf remarks 'ANOTHER Marmite order from New Zealand'. The sole Marmite factory in New Zealand was damaged in the Christchurch Earthquake of 2011. Further aftershocks led to the shutting down of the factory until late 2012. The remaining stocks ran out, leading to panic buying at inflated prices by Marmite aficionados. Quantity: 1 digital cartoon(s).

Research Papers, Lincoln University

This research provides an investigation into the impact on the North Island freight infrastructure, in the event of a disruption of the Ports of Auckland (POAL). This research is important to New Zealand, especially having experienced the Canterbury earthquake disaster in 2010/2011 and the current 2012 industrial action plaguing the POAL. New Zealand is a net exporter of a combination of manufactured high value goods, commodity products and raw materials. New Zealand’s main challenge lies in the fact of its geographical distances to major markets. Currently New Zealand handles approximately 2 million containers per annum, with a minimum of ~40% of those containers being shipped through POAL. It needs to be highlighted that POAL is classified as an import port in comparison to Port of Tauranga (POT) that has traditionally had an export focus. This last fact is of great importance, as in a case of a disruption of the POAL, any import consigned to the Auckland and northern region will need to be redirected through POT in a quick and efficient way to reach Auckland and the northern regions. This may mean a major impact on existing infrastructure and supply chain systems that are currently in place. This study is critical as an element of risk management, looking at how to mitigate the risk to the greater Auckland region. With the new Super City taking hold, the POAL is a fundamental link in the supply chain to the largest metropolitan area within New Zealand.

Images, UC QuakeStudies

A photograph of the north side of the ChristChurch Cathedral in Cathedral Square. The front of the building has been propped up with steel bracing but further earthquakes have caused more damage, leaving a gap between the bracing and the wall. The tower has been partially demolished, but the lower section is still visible. Wire fencing has been placed around the entire building. In the background, a crane is rising high above the square.

Images, UC QuakeStudies

A photograph of the north side of the ChristChurch Cathedral in Cathedral Square. The front of the building has been propped up with steel bracing but further earthquakes have caused more damage, leaving a gap between the bracing and the wall. The tower has been partially demolished, but the lower section is still visible. Wire fencing has been placed around the entire building. In the background, a crane is rising high above the square.

Images, UC QuakeStudies

A photograph of the north side of the ChristChurch Cathedral in Cathedral Square. The front of the building has been propped up with steel bracing but further earthquakes have caused more damage, leaving a gap between the bracing and the wall. The tower has been partially demolished, but the lower section is still visible. Wire fencing has been placed around the entire building. In the background, a crane is rising high above the square.

Images, UC QuakeStudies

A sign on a fence on Marine Parade in North New Brighton reads "We need your support. We say yes to a new local high school. Northeast Secondary Education Committee." The photographer comments, "A bike ride to New Brighton and the beach 3 weeks after the Feb 22 quake. Roads were still very rough and under reconstruction. I think this issue may be shelved for a while. Unless Shirley Boys High and Avonside Girls High can't be rebuilt, of course".

Images, UC QuakeStudies

Graffiti on a wooden wall depicts a child pointing at a site across the street and reads "I remember when the Kazbah was over there." The photographer comments, "A local street artist has commemorated Christchurch's deadliest earthquake. The anniversary is tomorrow. Where the photograph was taken was the site of the Ozone Hotel, which has now gone as well. For some of us who live and work in the East of Christchurch the earthquake was not what happened in the City as we were almost unaware of it. We had no water, toilets and most of all no electricity for weeks. For myself petrol was low and with tales of all the petrol stations on our side of town being damaged we could not take the chance of venturing out on severely damaged roads to find no petrol and the possibility of not getting home. We walked around and saw the damage that was local to us. TJ's Kazbah was one that stood out. A building that had a beauty with its round tower standing proud and always looked well kept - it was now collapsed. Its tower, which was once pointing towards the sky was laying on its side. It had kept its shape, but had a lightning shaped crack through it. The one thing that kept us feeling almost normal through the coming weeks was The Press our daily paper still being delivered even though the Press building and staff had suffered so badly themselves.

Audio, Radio New Zealand

A review of the week's news including... A tsunami warning after a severe 7.1 earthquake north of East Cape, Havelock North's residents finally get the chance to grill their local leaders, the Environment Minister says people who insist that every lake and river should be safe to swim in are being unrealistic, Kim Dotcom wins his bid to live stream his High Court appeal against his extradition, New Zealanders who've been living in Australia for up to ten years say they're reaching breaking point, legal action over faulty steel mesh triggers doubts about some house insurance, a prominent Maori leader is found guilty of defrauding his fellow trustees in the Wellington Tenths Trust, a South Canterbury farming official says stealing 500 cows is like stealing the Crown jewels - complicated but not impossible, Auckland mayoral candidate Vic Crone pledges to bring forward the cross-harbour tunnel project by a decade or more after saying she'd make no commitments on it, while another candidate, Phil Goff wants to introduce a living wage for all council staff, the transgender community wants the waiting times for sex change operations cut, a sit down chat with Olympic pole vaulting bronze medalist Eliza McCartney and the real story behind the 2nd Bledisloe Cup test in Wellington from a former Wallaby.

Images, UC QuakeStudies

A photograph looking north down Gayhurst Road, taken from the side of the bridge over the Avon River. Residential properties used to line the left-hand side of the road, and St Paul's church once stood on the corner. This was before the land was red-zoned as a result of the 2010 and 2011 Canterbury earthquakes. Separated cycle ways have recently been installed on both sides of the road. The photograph was modelled off an image taken by Mark Lincoln in September 2010.

Images, UC QuakeStudies

A photograph looking north down Gayhurst Road, taken from the side of the bridge over the Avon River. Residential properties used to line the left-hand side of the road, and St Paul's church once stood on the corner. This was before the land was red-zoned as a result of the 2010 and 2011 Canterbury earthquakes. Separated cycle ways have recently been installed on both sides of the road. The photograph was modelled off an image taken by Mark Lincoln in September 2010.

Images, UC QuakeStudies

A photograph looking north down Gayhurst Road, taken from the side of the bridge over the Avon River. Residential properties used to line the left-hand side of the road, and St Paul's church once stood on the corner. This was before the land was red-zoned as a result of the 2010 and 2011 Canterbury earthquakes. Separated cycle ways have recently been installed on both sides of the road. The photograph was modelled off an image taken by Mark Lincoln in September 2010.

Images, Alexander Turnbull Library

A woman walks through the snow in Christchurch and comments 'At least snow covers up ugly quake damage dear... Dear?' Her husband has disappeared into a hole that was covered in snow. Context: Heavy snow blanketed Christchurch today (Saturday 9 August) as the winter cold continued to be felt across both the North and South Islands. Snow began falling in Christchurch about 7am today and covered most of the city. (NZHerald: Aug 9 2011) Quantity: 1 digital cartoon(s).