Text reads 'If a secret microphone was smuggled into CERA's meetings?...' A group of CERA staff chat during tea at a meeting. They make unguarded comments about the state of affairs in earthquake-stricken Christchurch unaware that a microphone has been left in a sugarbowl. Context: the cartoon suggests that there seems to many Christchurch people to be a lack of real care on the part of officialdom as they struggle to recover from the earthquake damage. The microphone recalls that left 'accidentally' on a table at which Prime Minister John Key and the ACT candidate for the Epsom seat were having a highly publicised cup of tea. Then when it was discovered that a microphone had recorded their conversation John Key tried to get a court order to supress making it public. Quantity: 1 digital cartoon(s).
In a series of four frames we see ideas for the latest in NZ Adventure tourism. They show 'Ride the twisters', 'Dodge the masonry', 'Survive the snow dumps' and 'brown water punting'. The cartoons refer to the wild spring weather and the Canterbury earthquake of 4th September. Quantity: 1 digital cartoon(s).
Container Love: shipping container decorated with knitted and crocheted squares. Sumner, Christchurch. File reference: CCL-2012-05-12-Around-Sumner-May-2012 DSC_034.JPG From the collection of Christchurch City Libraries.
Container Love: shipping container decorated with knitted and crocheted squares. Sumner, Christchurch. File reference: CCL-2012-05-12-Around-Sumner-May-2012 DSC_025.JPG From the collection of Christchurch City Libraries.
Container Love: shipping container decorated with knitted and crocheted squares. Sumner, Christchurch. File reference: CCL-2012-05-12-Around-Sumner-May-2012 DSC_022.JPG From the collection of Christchurch City Libraries.
Container Love: shipping container decorated with knitted and crocheted squares. Sumner, Christchurch. File reference: CCL-2012-05-12-Around-Sumner-May-2012 DSC_023.JPG From the collection of Christchurch City Libraries.
There is a relationship between inelastic deformation and energy dissipation in structures that are subjected to earthquake ground motions. Thus, if seismic energy dissipation can be achieved by means of a separate non-load bearing supplementary damping system, the load bearing structure can remain elastic with continuing serviceability following the design level earthquake. This research was carried out to investigate the advantages of using added damping in structures. The control system consists of passive friction dampers called ring spring dampers installed in the ground floor of the structure using a tendon to transmit the forces to the other parts of the structure. The ring springs dampers are friction devices consisting of inner and outer ring elements assembled to form a spring stack. External load applied to the spring produces sliding action across mating ring interfaces. The damping forces generated by the dampers and transferred in the supplemental system to the structure by the tendon and horizontal links oppose the internal loads. A four storey-two bay steel frame structure was used in the study. Experimental and analytical studies to investigate the effectiveness of a supplemental control system are presented. The model was subjected to a series of earthquake simulations on the shaking table in the Structural Laboratory of the Civil Engineering Department, at the University of Canterbury. The earthquake simulation tests have been performed on the structure both with and without the supplemental control system. The earthquake simulations were a series of gradually increasing intensity replications of two commonly used earthquake records. This thesis includes detailed description of the structural model, the supplemental control system, the ring springs dampers and the data obtained during the testing. Analyses were then carried out on a twelve storey framed structure to investigate the possible tendon arrangements and the size and type of dampers required to control the response of a real building. Guidelines for determining the appropriateness of including a supplemental damping system have been investigated. The main features of the supplemental control system adopted in this research are: • It is a passive control system with extreme reliability and having no dependence on external power sources to effect the control action. These power sources may not be available during a major earthquake. • Ring springs are steel friction devices capable of absorbing large amounts of input energy. No liquid leakage can occur and minimal maintenance is required for the ring spring dampers. • With a damper-tendon system, the distribution of the dampers throughout the structure is not so critical. Only one or two dampers are used to produce the damping forces needed, and forces are then transferred to the rest of the building by the tendon system. • It is a relatively inexpensive control system with a long useful life.
The Canterbury Region is susceptible to a variety of natural hazards, including earthquakes, landslides and climate hazards. Increasing population and tourism within the region is driving development pressures and as more and more development occurs, the risk from natural hazards increases. In order to avoid development occurring in unacceptably vulnerable locations, natural hazard assessments are required. This study is a reconnaissance natural hazard assessment of Lakes Lyndon, Coleridge and Tekapo. There is restricted potential for development at Lake Lyndon, because the land surrounding the lake is owned by the Crown and has a number of development restrictions. However, there is the potential for conservation or recreation-linked development to occur. There is more potential for development at Lake Coleridge. Most of the land surrounding the lake is privately owned and has less development restrictions. The majority of land surrounding Lake Tekapo is divided into Crown-owned pastoral leases, which are protected from development, such as subdivision. However, there are substantial areas around the lake, which are privately owned and, therefore, have potential for development. Earthquake, landslide and climate hazards are the main natural hazards threatening Lakes Lyndon, Coleridge and Tekapo. The lakes are situated in a zone of active earth deformation in which large and relatively frequent earthquakes are produced. A large number of active faults lie within 15 km of each lake, which are capable of producing M7 or larger earthquakes. Ground shaking, liquefaction, landslides, tsunami and seiches are among the consequences of earthquakes, all of which have the potential to cause severe damage to lives, lifelines and infrastructure. Landslides are also common in the landscape surrounding the lakes. The majority of slopes surrounding the lakes are at significant risk from earthquake-induced failure under moderate to strong earthquake shaking. This level of shaking is expected to occur in any 50 year period around Lakes Lyndon and Coleridge, and in any 150 year period around Lake Tekapo. Injuries, fatalities and property damage can occur directly from landslide impact or from indirect effects such as flooding from landslide-generated tsunami or from landslide dam outbreaks. Lakes Lyndon, Coleridge and Tekapo are also susceptible to climate hazards, such as high winds, drought, heavy snowfall and heavy rainfall, which can lead to landslides and flooding. Future climate change due to global warming is most likely going to affect patterns of frequency and magnitudes of extreme weather events, leading to an increase in climate hazards. Before development is permitted around the lakes, it is essential that each of these hazards is considered so that unacceptably vulnerable areas can be avoided.
Photograph captioned by Fairfax, "Gerry Brownlee (left), EQC CEO Ian Simpson, and geotechnical specialist Nick Rogers explain the EQC plan to remediate land damaged in the Canterbury earthquake".
Photograph captioned by BeckerFraserPhotos, "Jeremy Stewart of Alice in Videoland holding 'When a City Falls', the film recently released about the 2010 and 2011 Canterbury earthquakes".
Kao Wei Liang, Team Leader of the Taiwan USAR team, being farewelled at the Christchurch International Airport after helping out with the emergency response to the Canterbury Earthquake.
With Tom Love - A principal of consulting firm Sapere Research Group, who was commissioned by the Canterbury District Health Board, to examine the population impact of February's earthquake.
A property manager has been questioned at the Royal Commission investigating the Canterbury earthquakes about why he didn't tell tenants the building they worked in was unsafe.
The earthquakes in Canterbury may have brought tragedy and economic hardship for many, but Christchurch business leaders say they're now seeing renewed signs of improving business confidence.
An Earthquake Commission policy of covering over asbestos in quake-damaged Canterbury houses and not making that information publicly available, is being described as shortsighted and potentially harmful.
The cost of insurance could rise by 20 per cent as a result of the Government bailout of AMI Insurance and the mounting cost of the Canterbury earthquakes.
Demolition companies and building owners in central Christchurch hope efforts by the Canterbury Earthquake Recovery Authority will speed up the city's rebuild after it's been languishing for weeks.
The Canterbury earthquake authority has now been legally vested with the extraordinary powers given to the Government under the state of national emergency declared after the February disaster.
Pyne Gould building tenants in Christchurch have told the Royal Commission of Inquiry into the Canterbury Earthquakes hearing they didn't feel safe there after the September quake.
Canterbury residents who haven't seen hide nor hair of a Earthquake Commission inspector have been told they might need to make a fresh claim to get noticed.
A new report says a major earthquake in Wellington would leave a bill of nearly 40 billion dollars, almost twice as much as that of the Canterbury quakes.
Photograph captioned by Fairfax, "A chandelier is recovered by a Southern Demolition excavator operator from a damaged shop, Shrimpton Radcliffe Design on Victoria Street, following the Canterbury earthquakes".
Photograph captioned by Fairfax, "Bevan Fergusson, caretaker, left, and Sunjay Ganda, participation and development manager, remove goals from the ruined hockey pitch at Porritt Park following Canterbury's earthquake".
A photograph showing a demolition of a 'red zoned' home in Dallington, following the series of earthquakes in Christchurch.
A photograph showing a demolition of a 'red zoned' home in Dallington, following the series of earthquakes in Christchurch.
A photograph showing a demolition of a 'red zoned' home in Dallington, following the series of earthquakes in Christchurch.
A photography showing Bill and Heather Allott outside their 'red zoned' home, following the series of earthquakes in Christchurch.
Liquefaction features and the geologic environment in which they formed were carefully studied at two sites near Lincoln in southwest Christchurch. We undertook geomorphic mapping, excavated trenches, and obtained hand cores in areas with surficial evidence for liquefaction and areas where no surficial evidence for liquefaction was present at two sites (Hardwick and Marchand). The liquefaction features identified include (1) sand blows (singular and aligned along linear fissures), (2) blisters or injections of subhorizontal dikes into the topsoil, (3) dikes related to the blows and blisters, and (4) a collapse structure. The spatial distribution of these surface liquefaction features correlates strongly with the ridges of scroll bars in meander settings. In addition, we discovered paleoliquefaction features, including several dikes and a sand blow, in excavations at the sites of modern liquefaction. The paleoliquefaction event at the Hardwick site is dated at A.D. 908-1336, and the one at the Marchand site is dated at A.D. 1017-1840 (95% confidence intervals of probability density functions obtained by Bayesian analysis). If both events are the same, given proximity of the sites, the time of the event is A.D. 1019-1337. If they are not, the one at the Marchand site could have been much younger. Taking into account a preliminary liquefaction-triggering threshold of equivalent peak ground acceleration for an Mw 7.5 event (PGA7:5) of 0:07g, existing magnitude-bounded relations for paleoliquefaction, and the timing of the paleoearthquakes and the potential PGA7:5 estimated for regional faults, we propose that the Porters Pass fault, Alpine fault, or the subduction zone faults are the most likely sources that could have triggered liquefaction at the study sites. There are other nearby regional faults that may have been the source, but there is no paleoseismic data with which to make the temporal link.
Shipping containers against the cliff on the road to Sumner, Christchurch. File reference: CCL-2012-05-12-Around-Sumner-May-2012 DSC_013.JPG From the collection of Christchurch City Libraries.
Shipping containers against the cliff on the road to Sumner, Christchurch. File reference: CCL-2012-05-12-Around-Sumner-May-2012 DSC_004.JPG From the collection of Christchurch City Libraries.