Rick Wentz is a Chartered geotechnical engineer originally from Northern California who has lived in New Zealand since 2011 - coming here in response to the Christchurch earthquakes. Rick talks to Mark about seismic risk - what it means for the general community and the role of a geotechnical engineering in helping to manage it.
Now have you ever wished you could play some cricket in the house on a rainy day? Well for one Christchurch family that dream's become a reality. Glenn Bongartz, with the help of his architect, upgraded his earthquake rebuild to feature a cricket wicket in the attic of the house. Glenn told Jimmy Ellingham how they did it.
Two teens. Two tragedies. And an unlikely friendship. Christchurch author Blair McMillan opens his novel with the escalating war in Syria, and the plight of Amir and his family. His surgeon father decides to try to send him and mother away from the violence - and Amir finds himself on a perilous journey - one that puts him on the other side of the planet. His path crosses with Milly, an angry teenager still reeling from the loss of her mother in the Christchurch earthquakes. Blair McMillan runs a swim school with his wife Karen by day - and Here Upon the Tide is his debut novel. He joins Susie to talk about it.
The Anglican church is considering whether to sell Christchurch's cardboard cathedral to plug a shortfall in the budget for restoring the original descimated in the earthquakes. The church leadership will discuss the future of the cardboard building during meetings at the weekend. It opened opposite Latimer square in 2013 as a temporary place of worship, but soom became popular with tourists too. Meanwhile a 2017 estimate put the cost of restoring the actual Cathedral at just over $100 million, but that's since ballooned to north of $155 million. Harcourts real estate agent, Mark O'Loughlin, speaks to Lisa Owen from Christchurch. [embed] https://players.brightcove.net/6093072280001/default_default/index.html?videoId=6336786667112
A business owner wants more stringent background checks for people creating professional online profiles after discovering a potential business advisor is currently on home detention for corruption. Gerard Gallagher was convicted in June after trying to personally profit from information obtained while working for the Canterbury Earthquake Recovery Authority and Ōtākaro Limited between 2014 and 2017. Online, he promotes himself as a Business Advisor despite still serving a sentence of 12 months' home detention. Niva Chittock reports.
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.
A magnitude six earthquake which struck in Canterbury just before quarter-past-nine Wednesday morning has left some nearby residents feeling a bit shaken. The quake, which struck 45 kilometres north of Geraldine at a depth of ten kilometres, was located in the Southern Alps, away from populated areas. It was widely felt in Geraldine, Timaru and Temuka - though there are no reports of serious damage or injury. Timaru District Council says it's closing a stadium and other facilities for assessment. Two people who experienced the quake, Janene Adams who's deputy chair of the Geraldine Community Board, and from further north, and the operator of the Mount Somers Holiday Park, Maureen Meanwell, spoke with Charlotte Cook
There's been a strong earthquake in Canterbury just after 9am. We speak to Scott Shannon, deputy mayor of Timaru and a John, a Pleasant Point resident.
An icon of Whakaraupō Lyttelton Harbour is set to re-open tomorrow, after being damaged in the Canterbury Earthquakes. The Governors Bay jetty, locally known for its extraordinary length and unofficial jetty jump competitions, has been closed since 2015. Now, it's back to its former glory, just in time for summer. Niva Chittock went for a sneak peek ahead of the official opening. [embed] https://players.brightcove.net/6093072280001/default_default/index.html?videoId=6338047392112
Sir Miles Warren and Maurice Mahoney were architectural revolutionaries who built a legendary partnership spanning 37 years. A new film currently in production aims to celebrate their incredible legacy and document the bitter fight to save their most iconic building - the Christchurch Town Hall - from demolition after the 2011 earthquake. Co-director and Maurice's daughter Jane Mahoney talks to Mark Leisham about the pairs legacy and the process of making the film.
Today Ali talks to Jesse about the insurance debacle for Christchurch home owners trying to settle with companies over their earthquake damaged homes. She advocating for the establishment of an "Insurance Department" as they have done in California.
A panel with Michael Bell, Steph Walker and Kiri Jarden. It’s almost 13 years since the devastating earthquake of 22 February 2011, which forced 70 percent of the Ōtautahi Christchurch CBD to be demolished. While the rebuild has been a slow and often difficult process in visions meeting reality, there is also much to celebrate in the city taking up the opportunity, through art and design, to remake it as a place for all.
Twelve years after the CTV building collapsed during the Christchurch earthquake, families of the victims killed inside have told an engineering disciplinary hearing they want justice and accountability. 115 people died when the six-storey building came down in February 2011. A complaint against an engineer whose firm designed the building is being heard by an Engineering New Zealand disciplinary committee. Dr Alan Reay lost a High Court bid to stop the hearing. Anna Sargent reports.
The families of the victims of the CTV building collapse in Christchurch have told an engineering disciplinary hearing they've been waiting 12 years for accountability. The building collapsed in the February 2011 earthquake killing 115 people. It was designed by Dr Alan Reay's firm - Reay was criticised by the Earthquake Royal Commission for handing sole responsibility of it to an inexperienced employee. Reay has tried to stop the disciplinary process going ahead but it got underway in Christchurch today. Reporter Anna Sargent spoke to Charlotte Cook.
A complaint against an engineer whose firm designed the CTV building that collapsed in the Christchurch earthquake will be heard by a disciplinary committee on Monday. One-hundred-and-fifteen people were killed when the six-storey building came down in February 2011. Dr Alan Reay lost a High Court bid to stop the hearing. Reporter Anna Sargent spoke to Corin Dann.
We examined the stratigraphy of alluvial fans formed at the steep range front of the Southern Alps at Te Taho, on the north bank of the Whataroa River in central West Coast, South Island, New Zealand. The range front coincides with the Alpine Fault, an Australian-Pacific plate boundary fault, which produces regular earthquakes. Our study of range front fans revealed aggradation at 100- to 300-year intervals. Radiocarbon ages and soil residence times (SRTs) estimated by a quantitative profile development index allowed us to elucidate the characteristics of four episodes of aggradation since 1000 CE. We postulate a repeating mode of fan behaviour (fan response cycle [FRC]) linked to earthquake cycles via earthquake-triggered landslides. FRCs are characterised by short response time (aggradation followed by incision) and a long phase when channels are entrenched and fan surfaces are stable (persistence time). Currently, the Te Taho and Whataroa River fans are in the latter phase. The four episodes of fan building we determined from an OxCal sequence model correlate to Alpine Fault earthquakes (or other subsidiary events) and support prior landscape evolution studies indicating ≥M7.5 earthquakes as the main driver of episodic sedimentation. Our findings are consistent with other historic non-earthquake events on the West Coast but indicate faster responses than other earthquake sites in New Zealand and elsewhere where rainfall and stream gradients (the basis for stream power) are lower. Judging from the thickness of fan deposits and the short response times, we conclude that pastoral farming (current land-use) on the fans and probably across much of the Whataroa River fan would be impossible for several decades after a major earthquake. The sustainability of regional tourism and agriculture is at risk, more so because of the vulnerability of the single through road in the region (State Highway 6).
Orientation: Large-scale events such as disasters, wars and pandemics disrupt the economy by diverging resource allocation, which could alter employment growth within the economy during recovery. Research purpose: The literature on the disaster–economic nexus predominantly considers the aggregate performance of the economy, including the stimulus injection. This research assesses the employment transition following a disaster by removing this stimulus injection and evaluating the economy’s performance during recovery. Motivation for the study: The underlying economy’s performance without the stimulus’ benefit remains primarily unanswered. A single disaster event is used to assess the employment transition to guide future stimulus response for disasters. Research approach/design and method: Canterbury, New Zealand, was affected by a series of earthquakes in 2010–2011 and is used as a single case study. Applying the historical construction–economic relationship, a counterfactual level of economic activity is quantified and compared with official results. Using an input–output model to remove the economy-wide impact from the elevated activity reveals the performance of the underlying economy and employment transition during recovery. Main findings: The results indicate a return to a demand-driven level of building activity 10 years after the disaster. Employment transition is characterised by two distinct periods. The first 5 years are stimulus-driven, while the 5 years that follow are demand-driven from the underlying economy. After the initial period of elevated building activity, construction repositioned to its long-term level near 5% of value add. Practical/managerial implications: The level of building activity could be used to confidently assess the performance of regional economies following a destructive disaster. The study results argue for an incentive to redevelop the affected area as quickly as possible to mitigate the negative effect of the destruction and provide a stimulus for the economy. Contribution/value-add: This study contributes to a growing stream of regional disaster economics research that assesses the economic effect using a single case study.
The city of Christchurch, New Zealand, incurred significant damage due to a series of earthquakes in 2010 and 2011. The city had, by the late 2010s, regained economic and social normalcy after a sustained period of rebuilding and economic recovery. Through the concerted rebuilding effort, a modern central business district (CBD) with redesigned infrastructure and amenities was developed. The Christchurch rebuild was underpinned by a commitment of urban planners to an open and connected city, including the use of innovative technologies to gather, use and share data. As was the case elsewhere, the COVID-19 pandemic brought about significant disruptions to social and economic life in Christchurch. Border closures, lockdowns, trading limitations and other restrictions on movement led to changes in traditional consumer behaviors and affected the retail sector’s resilience. In this study, we used CBD pedestrian traffic data gathered from various locations to predict changes in retail spending and identify recovery implications through the lens of retail resilience. We found that the COVID-19 pandemic and its related lockdowns have driven a substantive change in the behavioral patterns of city users. The implications for resilient retail, sustainable policy and further research are explored.
The magnitude 7.8 earthquake that struck North Canterbury, on the east coast of New Zealand’s South Island on 14 November 2016 had significant impacts and implications for the community of Kaikōura and surrounding settlements. The magnitude and scope of this event has resulted in extensive and ongoing geological and geophysical research into the event. The current paper complements this research by providing a review of existing social science research and offering new analysis of the impact of the earthquake and its aftermath on community resilience in Kaikōura over the past five years. Results demonstrate the significant economic implications for tourism, and primary industries. Recovery has been slow, and largely dependent on restoring transportation networks, which helped catalyse cooperation among local hospitality providers. Challenges remain, however, and not all sectors or households have benefited equally from post-quake opportunities, and long-term recovery trajectories continue to be hampered by COVID-19 pandemic. The multiple ongoing and future stressors faced by Kaikōura require integrated and equitable approaches in order to build capability and capacity for locally based development pathways to ensure long-term community resilience.
The susceptibility of precast hollow-core floors to sustain critical damage during an earthquake is now well-recognized throughout the structural engineering community in New Zealand. The lack of shear reinforcement in these floor units is one of the primary reasons causing issues with the seismic performance of these floors. Recent research has revealed that the unreinforced webs of these floor units can crack at drift demands as low as 0.6%. Such observation indicates that potentially many of the existing building stock incorporating hollow-core flooring systems in cities of relatively high seismic activity (e.g. Wellington and Christchurch) that probably have already experienced a level of shaking higher than 0.6% drift in previous earthquakes might already have their floor units cracked. However, there is little information available to reliably quantify the residual gravity load-carrying capacity of cracked hollow-core floor units, highlighting the need to understand the post-cracking behavior of hollow-core floor units to better quantify the extent of the risk that cracked hollow-core floor units pose
Background: Up to 6 years after the 2011 Christchurch earthquakes, approximately one-third of parents in the Christchurch region reported difficulties managing the continuously high levels of distress their children were experiencing. In response, an app named Kākano was co-designed with parents to help them better support their children’s mental health. Objective: The objective of this study was to evaluate the acceptability, feasibility, and effectiveness of Kākano, a mobile parenting app to increase parental confidence in supporting children struggling with their mental health. Methods: A cluster-randomized delayed access controlled trial was carried out in the Christchurch region between July 2019 and January 2020. Parents were recruited through schools and block randomized to receive immediate or delayed access to Kākano. Participants were given access to the Kākano app for 4 weeks and encouraged to use it weekly. Web-based pre- and postintervention measurements were undertaken. Results: A total of 231 participants enrolled in the Kākano trial, with 205 (88.7%) participants completing baseline measures and being randomized (101 in the intervention group and 104 in the delayed access control group). Of these, 41 (20%) provided full outcome data, of which 19 (18.2%) were for delayed access and 21 (20.8%) were for the immediate Kākano intervention. Among those retained in the trial, there was a significant difference in the mean change between groups favoring Kākano in the brief parenting assessment (F1,39=7, P=.012) but not in the Short Warwick-Edinburgh Mental Well-being Scale (F1,39=2.9, P=.099), parenting self-efficacy (F1,39=0.1, P=.805), family cohesion (F1,39=0.4, P=.538), or parenting sense of confidence (F1,40=0.6, P=.457). Waitlisted participants who completed the app after the waitlist period showed similar trends for the outcome measures with significant changes in the brief assessment of parenting and the Short Warwick-Edinburgh Mental Well-being Scale. No relationship between the level of app usage and outcome was found. Although the app was designed with parents, the low rate of completion of the trial was disappointing. Conclusions: Kākano is an app co-designed with parents to help manage their children’s mental health. There was a high rate of attrition, as is often seen in digital health interventions. However, for those who did complete the intervention, there was some indication of improved parental well-being and self-assessed parenting. Preliminary indications from this trial show that Kākano has promising acceptability, feasibility, and effectiveness, but further investigation is warranted. Trial Registration: Australia New Zealand Clinical Trials Registry ACTRN12619001040156; https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=377824&isReview=true
High demolition rates were observed in New Zealand after the 2010-2011 Canterbury Earthquake Sequence despite the success of modern seismic design standards to achieve required performance objectives such as life safety and collapse prevention. Approximately 60% of the multi-storey reinforced concrete (RC) buildings in the Christchurch Central Business District were demolished after these earthquakes, even when only minor structural damage was present. Several factors influenced the decision of demolition instead of repair, one of them being the uncertainty of the seismic capacity of a damaged structure. To provide more insight into this topic, the investigation conducted in this thesis evaluated the residual capacity of moderately damaged RC walls and the effectiveness of repair techniques to restore the seismic performance of heavily damaged RC walls. The research outcome provided insights for developing guidelines for post-earthquake assessment of earthquake-damaged RC structures. The methodology used to conduct the investigation was through an experimental program divided into two phases. During the first phase, two walls were subjected to different types of pre-cyclic loading to represent the damaged condition from a prior earthquake, and a third wall represented a repair scenario with the damaged wall being repaired using epoxy injection and repair mortar after the pre-cyclic loading. Comparisons of these test walls to a control undamaged wall identified significant reductions in the stiffness of the damaged walls and a partial recovery in the wall stiffness achieved following epoxy injection. Visual damage that included distributed horizontal and diagonal cracks and spalling of the cover concrete did not affect the residual strength or displacement capacity of the walls. However, evidence of buckling of the longitudinal reinforcement during the pre-cyclic loading resulted in a slight reduction in strength recovery and a significant reduction in the displacement capacity of the damaged walls. Additional experimental programs from the literature were used to provide recommendations for modelling the response of moderately damaged RC walls and to identify a threshold that represented a potential reduction in the residual strength and displacement capacity of damaged RC walls in future earthquakes. The second phase of the experimental program conducted in this thesis addressed the replacement of concrete and reinforcing steel as repair techniques for heavily damaged RC walls. Two walls were repaired by replacing the damaged concrete and using welded connections to connect new reinforcing bars with existing bars. Different locations of the welded connections were investigated in the repaired walls to study the impact of these discontinuities at the critical section. No significant changes were observed in the stiffness, strength, and displacement capacity of the repaired walls compared to the benchmark undamaged wall. Differences in the local behaviour at the critical section were observed in one of the walls but did not impact the global response. The results of these two repaired walls were combined with other experimental programs found in the literature to assemble a database of repaired RC walls. Qualitative and quantitative analyses identified trends across various parameters, including wall types, damage before repair, and repair techniques implemented. The primary outcome of the database analysis was recommendations for concrete and reinforcing steel replacement to restore the strength and displacement capacity of heavily damaged RC walls
The seismic performance of soil profiles with potentially liquefiable deposits is a complex phenomenon that requires a thorough understanding of the soil properties and ground motion characteristics. The limitations of simplified liquefaction assessment methods have prompted an increase in the use of non-linear dynamic analysis methods. Focusing on onedimensional site response of a soil column, this thesis validated a soil constitutive model using in-situ pore pressure measurements and then assessed the influence of input ground motion characteristics on soil column response using traditional and newly developed metrics. Pore pressure recordings during the Canterbury Earthquake Sequence (CES) in New Zealand were used to validate the PM4Sand constitutive model. Soil profile characterization was key to accurate prediction of excess pore pressure response and accounting for any densification during the CES. Response during multiple earthquakes was captured effectively and cross-layer interaction demonstrated the model capability to capture soil response at the system-level. Synthetic and observed ground motions from the Christchurch earthquake were applied to the validated soil column to quantify the performance of synthetic motions. New metrics were developed to facilitate a robust comparison to assess performance. The synthetic input motions demonstrated a slightly larger acceleration and excess pore pressure response compared to the observed input motions. The results suggest that the synthetic motions may accumulate higher excess pore pressure at a faster rate and with fewer number of cycles in the shear response. This research compares validated soil profile subject to spectrally-matched pulse and non-pulse motions, emphasizing the inclusion of pulse motions with distinctive characteristics in ground motion suites for non-linear dynamic analysis. However, spectral matching may lead to undesired alterations in pulse characteristics. Cumulative absolute velocity and significant duration significantly differed between these two groups compared to the other key characteristics and contributed considerably to the liquefaction response. Unlike the non-pulse motions, not all of the pulse motions triggered liquefaction, likely due to their shorter significant duration. Non-pulse motions developed a greater spatial extent of liquefaction triggering in the soil profile and extended to a greater depth
“Perambulators are one of the necessities of the nineteenth century. The children of savages may roll in the dust or be carried in a shawl, or strapped to a piece of board, but the children of civi…
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And just like that, somehow we’re only three sleeps from Christmas and another year has flown by. It always seems like time speeds up once we hit September and that the final three months of the year disappear in the … Continue reading →
When it comes to researching properties and places around Christchurch, we historians review and compare a wide range of resources in order to figure out exactly what was happening there during the 19th century. By far one of the most … Continue reading →
Welcome back to Part Two of ‘displaying wealth and status in buildings’. Now, before we get into the interior of the building, I want you to use your imagination when looking at the upcoming photos. Prior to taking these photos, … Continue reading →
The act of showing off wealth and status through material is a concept that has been happening throughout human history. This does not necessarily mean that the person had the wealth and status they were portraying, instead some people just … Continue reading →
Unless you’ve been living under a rock, you’ll be aware that Aotearoa New Zealand is facing a cost-of-living crisis. That weekly visit to the supermarket seems to be getting more expensive each time. Throughout history people have sought ways of … Continue reading →