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Over on the eastern hills of Sumner, Redcliffs, and Mt Pleasant , it seems the shaking of the ground was so extreme that no practical building code could have saved many of the houses. Case study: Christchurch 2011 (HIC) Causes The earthquake struck the city of Christchurch in New Zealand on 22 February 2011. Liquefaction on Kilmore St ( Asher Trafford), Liquefaction in park off Colombo St (Asher Trafford). John Clague, an expert in natural hazards at Simon Fraser University in British Columbia, said it was unclear what caused such serious damage to modern buildings, but said the answer could be the "liquefaction" of the ground when the shaking began. Photograph: Christchurch Press/Reuters. It was been done at the time when the Americas Cup parade was held in CHCH. Over half of the deaths occurred in the six-storey Canterbury Television (CTV) Building, which collapsed and caught fire in the earthquake. Old houses and commercial buildings constructed in the early 20th century, or in some cases in the 19th century, and which relied on single or double brick for their structural integrity, disintegrated rapidly. Unfortunately, a house with a concrete pad that has cracked and split is history. I do not know who the architects were for the original construction but the engineers were Holmes Wood Poole and Johnstone. Presumably it was built to the latest codes so as to absorb the energy without suffering structural failure. Each day over the last five months, as I have driven to work, I have looked with wonder at a multi-million-dollar modern home owned by a well-known sporting identity, which looks normal from the road but is going to be pulled down for exactly this reason. As for the low-lying eastern suburbs, here too it won’t be until the engineers’ reports are available that the real picture will emerge. I liken it to an undergound tsunami, that travelled through the aquifer from the epicentre, and then burst upwards as it hit the underlying rocks of the Port Hills. Both this building and the now Hotel So were built at about the same time. "When shaken, these sediments transform into a liquid, causing irregular settlement of the ground, which is extremely damaging to buildings and buried structures, like water lines.". However, on the western hills, where I live, the form of cladding seems relevant. This time it was often colleagues, classmates or complete strangers who comforted and hel… Kind regards "But even if they'd known about the fault, they wouldn't have been sure it would produce such strong shaking, so they might have still underestimated what actually occurred. Originally this was known as the ‘Drainage Board Building’. The earthquake damage to modern buildings in Christchurch caught many experts by surprise and suggests the city was more prone to destructive tremors than local planners realised. A significant amount of drilling of holes both in the concrete walls and floors was done. The Christchurch building inspectors made multiple visits at key times to our New Zealand home, particularly when the foundations were being laid. In contrast, in parts of the low-lying Eastern suburbs I assume that the liquefaction damage was indeed through subsidence, as I have no evidence to argue otherwise. This core is still visible in the ‘after’ photo. Commentary on agriculture, rural development, and wider issues. Before and after shots (below) of the seven storey CTV building (built in the 1980s) show another modern-looking building. There is a somewhat historical (probably about 1999) but generally informative assessment of the liquefaction risks in Christchurch at http://ecan.govt.nz/publications/General/solid-facts-christchurch-liquefaction.pdf However, I think that if they were to write this document again it would say some things differently. Because noticeable earthquakes are rare in most areas, people may not recognize that the objects and buildings around them represent potential hazards. Christchurch Earthquake Its is the energy being moved through the rock like a whale song in the ocean. In terms of magnitude, this was just a moderate earthquake, but the local effects on Christchurch have been huge because of its proximity and shallowness. In any case, the Uni itself is being used as a base for rescue personnel. Most of these buildings had no damage or only a little. Grand Chancellor Hotel with earthquake damage and tilting at 2 degrees. Part of the answer is that the Japanese had become complacent about tsunamis and over-confident about the measures supposedly in place to protect them. On 22 February 2011, at 12:51 pm, Christchurch was struck by a magnitude 6.3 earthquake. I had always thought before the quakes, that the columns in the ground floor holding up everything in the floors above above were an inherent weakness. I have also looked with wonder at the simplicity of house construction in Uruguay, where earthquakes are essentially unknown. As the plates move they cause earthquakes and causing a lot of damage. Maybe the wonder is that more modern buildings have not collapsed, and perhaps we should give due credit for that. Christchurch Hospital was evacuated due to damage in some areas, but soon reopened to treat the injured. So there are many potential ways to create safer buildings that will ride out an earthquake and remain fit for use – and Geoff says many of these will be visible in new buildings around Christchurch, especially those on Cambridge This provides a reminder that the Christchurch earthquake really was a local event: short, sharp and vicious. Water pipes, roads, bridges, power lines, cell phone towers and ordinary phone lines were broken or damaged. Liquefaction happens when underground water in the soil comes to the surfac… A reason to why there was so much damage done was because that the land, infrastructure and roads were still either damaged or weak due to the 2010 Christchurch earthquake which had a magnitude of 7.1. many building which Of the 185 victims, 115 people died in the Canterbury Television building alone, while another 18 died in the collapse of PGC House, and eight were killed when masonry fell on Red Bus number 702 in Colombo Street. The earthquake epicentre was near Lyttelton, just 10 It is the materials used that cause the problems. It was turned down by a number of building companies because of the dubious nature of the project. I was totally wrong, the found floor held up while everything above collapsed onto it! What caused the Christchurch earthquake? I would credit both you and your website. This building is adjacent to the Avon River in Cambridge Terrace. The critical issue with this earthquake was that the epicentre was at shallow depth under Christchurch, so many people were within 10 to 20 kilometres (6 to 12 miles) of the fault rupture. Though the government supplied money for those who were fired, businesses that needed re … Earthquake resistance can and is, in many cases, built into the design of the building. At 12.51 p.m. on Tuesday 22 February 2011, a magnitude 6.3 earthquake caused severe damage in Christchurch and Lyttelton, killing 185 people and injuring several thousand. It would seem that some were killed by the ensuing fire after being trapped. ( Log Out / Debbie Jarvis It was with surprise that the Drainage Board/PGC which collapsed onto the first floor, did not collapse completely. In my Uni office, and in sharp contrast to the September earthquake, there is not one paper or book that has moved. The government declared a state of national emergency, which stayed in force until 30 April 2011. Beaches and waterways were polluted for many … This building looks heavy but with light structural support in the corners. Other earthquakes have resulted in far bigger death tolls, not least the Japanese earthquake and tsunami just 20 days later. (Photo credits: The first three photos in this post come from Asher Trafford. Where the shaking or ground movement was severe, then houses on piles seemed to fare somewhat better than those on concrete pads. As each day goes by, the task of rebuilding Christchurch city and suburbs seems to grow. Asked by Wiki User 0 1 2 Answer Top Answer Wiki User Answered 2012-05-07 03:09:14 2012-05-07 03:09:14 Because you're fat. [Update of 1 March: There are reports that the structural strength was supposed to come from the ‘core’ built into the rear of the building. Yet only a few km away there is no damage. Monday’s COVID-19 decision will be a defining moment for New Zealand, Contact-tracing will be the Achilles heel of the COVID-19 program at LEVEL 3. Of all the buildings that have been affected by the earthquakes this one has demonstrated to me that looks alone are most certainly not any indication of resilience or strength. I am preparing a report on the Christchurch earthquake for Rotary Down Under magazine and I’m wondering if I might have permission to publish your image of Liquefaction on Kilmore St? A M w 6.2 (M L 6.3) earthquake occurred in Christchurch on Tuesday 22 February 2011 at 12:51 p.m. local time (23:51 UTC, 21 February). Warm regards, On 22 February 2011, a 6.3 magnitude earthquake struck Christchurch shortly before 12:50pm at a shallow depth of four kilometres. Some buildings caught fire after the February earthquake. Even the underground fuel tanks at my local service station, filled with fuel just the day before, were thrust upwards by this force. The messages from the 7.1 ‘dress rehearsal’ earthquake on September 2010 seemed reasonably straightforward. If you have an earthquake that has a 90% chance of not being exceeded in 50 years, the authorities might say that's an acceptable risk, we can live with that. Enter your email address to follow this blog and receive notifications of new posts by email. It seems that we do indeed have very stringent building codes in New Zealand. Most Cantabrians were away from their homes when the 6.3-magnitude earthquake struck at 12.51 p.m. on 22 February 2011. At least up until the mid 1980s, the designs were non-ductile. Hundreds of houses were destroyed, including the Christchurch Cathedral, and damages will probably sum up to some billion dollars. When the earthquake gets very severe - as in the February 22, 2011, Christchurch earthquake, everything is damaged to some extent. Meagan Jones What we do know for sure is that thousands of homes cannot be brought back to being livable. It failed to attract tenants as I recall and was retro fitted as an hotel in the early 1990s. As for the brick chimneys on the older wooden houses, well they descended ungracefully to the ground. Houses with modern timber structural framing also stood up particularly well. ", He added: "Experts have been surprised that the town itself has been hit.". Civil defence declared a category 3 emergency, … The codes were further strengthened in 1976 with the concept of ‘controlled failure’, and strengthened again in 1984 and 1992. Christchurch Earthquake Case Study A case study of an earthquake in a HIC. The severity of the damage appears to be due to a combination of the earthquake coming from a previously unknown fault that runs beneath the city from the nearby Alpine fault, and the violence of the shaking because the city rests on damp sediments.
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