This was the second major earthquake to hit the city; the previous quake occurred on 4 September 2010 and registered at a 7.1 magnitude. [Update of 1 March: there are conflicting reports as to the date of construction. Earthquake is a combination of a lot of frequencies. Houses with modern timber structural framing also stood up particularly well. Whether or not PGC were actually the building owners in 2011, or simply the major tenants with naming rights, is not clear to me. The 6.3 magnitude earthquake that struck Christchurch this morning was considerably less powerful than the 7.1 magnitude shake that hit last September, and yet it … Case study: Christchurch 2011 (HIC) Causes The earthquake struck the city of Christchurch in New Zealand on 22 February 2011. As each day goes by, the task of rebuilding Christchurch city and suburbs seems to grow. It was the middle of a working day and many people were at school or work, having lunch or running errands. Presumably it was built to the latest codes so as to absorb the energy without suffering structural failure. Even within Christchurch, location was of huge importance, but there is more to it than that. On 22 February 2011, a 6.3 magnitude earthquake struck Christchurch shortly before 12:50pm at a shallow depth of four kilometres. 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. The December 2011 and February 2016 earthquakes were off the coast, in Pegasus Bay, but the movement on the earthquake … When the earthquake gets very severe - as in the February 22, 2011, Christchurch earthquake, everything is damaged to some extent. Because noticeable earthquakes are rare in most areas, people may not recognize that the objects and buildings around them represent potential hazards. An a… Why Was New Zealand's Latest Earthquake So Deadly? Eventually the Drainage Board morphed into Environment Canterbury. In other words , they were built for strength, but with rigidity rather than the flexibility needed to absorb the energy of a huge quake. One small but perhaps important point is that at least in some places the water and sand continued to bubble up for hours after the earthquake and not just during the earthquake. In any case, the Uni itself is being used as a base for rescue personnel. Some buildings caught fire after the February earthquake. I would credit both you and your website. Though the government supplied money for those who were fired, businesses that needed re … Even the underground fuel tanks at my local service station, filled with fuel just the day before, were thrust upwards by this force. 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. Why did so many buildings survive the earthquake? 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This core is still visible in the ‘after’ photo. A significant amount of drilling of holes both in the concrete walls and floors was done. The September 2010, February 2011 and June 2011 earthquakes did not cause tsunamis because they happened on land and did not disrupt the sea floor. Unfortunately, the Arts Centre, which was built from 1877 onwards, suffered some The Christchurch Central Recovery Plan, often referred to as the Blueprint, is the plan developed by the Fifth National Government of New Zealand for the recovery of the Christchurch Central City from a series of earthquakes, in particular the February 2011 Christchurch earthquake.. 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. It is the materials used that cause the problems. Many old, historic buildings have been earthquake strengthened in the last 20 years. Print this … Both this building and the now Hotel So were built at about the same time. Some buildings will be written off and torn down, while others will be repairable or declared safe for immediate occupation. Hi Keith, Christchurch copes with a tragedy it did not see coming By Larry Greenemeier on February 22, 2011 … [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. Liquefaction on Kilmore St ( Asher Trafford), Liquefaction in park off Colombo St (Asher Trafford). This is the building where most of the deaths occurred, perhaps as many as a hundred or even more, including most of the foreign deaths at the Kings Language School. At least up until the mid 1980s, the designs were non-ductile. Earthquake resistance can and is, in many cases, built into the design of the building. It was built nearly ten years after the 1976 regulations [see update above] which introduced the principles of ‘controlled failure’ and may also have been subject to the 1984 regulations. New Zealand is apart of the Pacific Ring of Fire. Projects like this are rare but do happen especially if someone is determined to get their way. Is the Mycoplasma bovis eradication campaign on track? It has treated over 220 serious injuries so far, even though sometimes they were working by torchlight. So one has to ask the question, how could the tsunami have killed so many people in a country that was supposed to be the most tsunami-aware nation on Earth? 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. Over half of the deaths occurred in the six-storey Canterbury Television (CTV) Building, which collapsed and caught fire in the earthquake. Most of the houses have timber framing and this has stood up well. Hi, with regard to the Grand Chancellor building it should never have been built. The real truth will never be revealed it’s just too embarrasing, but speak to any builder that was not involved in the Grand Chancellor and if they are willing they will tell you that it was always a disaster waiting to happen. However, on the western hills, where I live, the form of cladding seems relevant. "New Zealand has excellent earthquake standards in its building codes, but those standards were much more stringent on the Alpine fault to the west of Christchurch than in the city, where secondary faults are poorly known. These are just three of many photos taken by Asher, who jumped on his bike and took some amazing photos around the city in the immediate aftermath. The earthquake epicentre was near Lyttelton, just 10 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. Thirty-nine people lost their lives when unreinforced It may have been 1979.] The New Zealand defence forces have been called in to help move people out of the central business district.Fires were reported at the Canterbury Television (CTV) … "Liquefaction is a huge problem in Christchurch because the city is built on an alluvial plain, on sediments that are vulnerable to liquefaction," Clague said. Sorry, your blog cannot share posts by email. Either way, there are questions to be answered as to why the failure was so catastrophic. Also, houses built on a concrete pad in areas adjacent to streams and waterways, were found to be susceptible to cracking of the pad linked to liquefaction of the soils. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Many thanks and I look forward to hearing from you soon. Why and how did China markets become so important for New Zealand? Christchurch Earthquake Its is the energy being moved through the rock like a whale song in the ocean. Change ). What caused the Christchurch earthquake? It is the stringent New Zealand building codes that make house building so expensive in this country. Officials will now inspect buildings and draw up an inventory of damage. 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. Semi official reports coming through are suggesting more than 500 buildings in the CBD will have to go. Thanks. The codes focus on the standards that have to be met, rather than specifying precise building procedures. "You can't protect against everything, because it's simply too expensive. 0 1 2 … Anywhere adjacent to a current or former spring was at risk. (Photo credits: The first three photos in this post come from Asher Trafford. It would seem that some were killed by the ensuing fire after being trapped. 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. Pingback: Rebuilding Christchurch | PHSGeogBlog. 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). But the 2011 Christchurch quake, … The codes were further strengthened in 1976 with the concept of ‘controlled failure’, and strengthened again in 1984 and 1992. Water pipes, roads, bridges, power lines, cell phone towers and ordinary phone lines were broken or damaged. ( Log Out / The story behind the failure of the 26 (some reports say 27) level Grand Chancellor Hotel, constructed in 1995, will take some time to emerge. Commentary on agriculture, rural development, and wider issues. ( Log Out / There are many puzzles as to why some of Christchurch’s buildings have survived the 6.3 earthquake of February 2011, and others have not. Perhaps the ground acceleration went beyond the design capacity, as there is no doubt the ground acceleration was extreme. ", Damp sediments under Christchurch made tremor more violent, Survivors are taken from a modern building damaged by Tuesday's earthquake in Christchurch. The cathedral and many other old brick buildings were known to be vulnerable to shaking and some had been weakened by the magnitude 7 earthquake that struck more than 25 miles outside the city six months ago. I have also looked with wonder at the simplicity of house construction in Uruguay, where earthquakes are essentially unknown. Government’s food and fibre reset report lacks a core, Quantitative easing floods capital markets, The ongoing search for new markets – India and beyond, Rugby’s role in a greater South Pacific strategic reset, A1 milk predisposes to asthma and lung inflammation, COVID-19 scenarios are becoming increasingly evident, COVID-19 is a science of uncertainty and an art of probability, North-East Asian markets as alternatives to China. 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. Post was not sent - check your email addresses! A lot will depend on whether the concrete pads have shifted, cracked, and tilted. It failed to attract tenants as I recall and was retro fitted as an hotel in the early 1990s. Unfortunately, a house with a concrete pad that has cracked and split is history. The liquefaction on these soils is much greater than in September, and initial reports are of up to 150,000 tonnes of sand and silt needing to be removed, compared to about 30,000 tonnes last September. The earthquake struck the Canterbury region in New Zealand's South Island and was centred 6.7 kilometres (4.2 mi) south-east of the centre of Christchurch, New Zealand's second-most populous city. Maurice Lamontagne, a seismologist at the Geological Survey of Canada, said: "What surprised me most was not seeing the damage to masonry buildings like the cathedral's bell-tower but to see new concrete buildings crumbling down. Photograph: Christchurch Press/Reuters. As had happened after the 4 September 2010quake, there was a lot of liquefaction. This building looks heavy but with light structural support in the corners. It is in Cashel St, several hundred metres from the Avon River. Hi there, I was wondering if I could use your picture for a poster I am presenting at the NZ Society of Earthquake Engineers conference. Why buildings are managed for earthquake risk Experience from Christchurch and overseas has shown that the failure of earthquake-prone buildings, or parts, can endanger lives. Clearly it suffered immediate damage, but it was only some hours later that it began to tilt. Christchurch Earthquake Case Study A case study of an earthquake in a HIC. Although Lincoln Uni does remain closed, that is because many staff and students live in the city. 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. Pingback: YEAR 5 SCIENCE PROJECT-FINAL | YEAR 5 SCIENCE PROJECT. 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. At least over my side of town (Halswell), I saw evidence in the 7.1 September earthquake of a powerful wave. 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. And in the days after the earthquake, it was the Japanese media who were the most persistent in asking why the building failed as it did and killed so many… In my Uni office, and in sharp contrast to the September earthquake, there is not one paper or book that has moved.
why did so many buildings survive the christchurch earthquake 2011