• 2011, Lyttelton, magnitude 6.3, ground shaking intensity 8.
How much do the Wellington fault lines move? Building and Construction Minister Jenny Salesa says the Government is taking a harder look at low-damage design. The $850 million motorway will connect Linden in north Wellington to Mackays Crossing, near Paekākāriki on the Kāpiti Coast, providing an alternative roading link for the region. 0000003688 00000 n 0000233445 00000 n Those buildings, such as Statistics House, were subsequently demolished, or exempt from a targeted damage evaluation. The Wellington Fault passes under significant infrastructure such as the ferry terminal, motorway, railway, and several bridges along the Hutt Valley, all of which could be put out of action when the fault next ruptures. The 2010 Darfield magnitude 7.1 quake caused ground shaking of 5 in the city, while the magnitude 6.3 Lyttelton quake caused ground shaking of 8, because it was both closer to the city and shallower. A new seawall will be constructed next to the planned Hutt Valley walkway and cycleway, and the Ngauranga-to-Petone cycleway will also be designed to cope with sea level rise. 0000025869 00000 n
Rupture of the Wellington Fault, (as well as the many other active faults in the Wellington region, including the Wairarapa Fault, the Ohariu Fault and the subduction interface) would cause a variety of major earthquake hazards. The council has surveyed 5000 buildings since 2004, with 1000 of them identified as earthquake-prone. Of those, 400 had been strengthened, and 600 still needed to be upgraded.
“The main problems identified in the detailed seismic assessment were with the bell frames,” Te Pae Mahara manager Brodie Stubbs said in a statement. Australia-born Joshua Dorman takes a pragmatic approach to living in the quake-prone capital.
The latest media release from GNS Science suggests that the hard volcanic rocks of Banks Peninsula may have reflected the earthquake’s energy, compounding its impact on the surface: http://www.gns.cri.nz/Home/News-and-Events/Media-Releases/earthquake-part-of-aftershock-sequence. A large, shallow daytime earthquake of around magnitude 7.4 along the Wellington fault would probably result in around 500 deaths, 4,000 injuries, and perhaps 1,800 people trapped and over 100,000 buildings damaged. That has not come without pain.
Wellington's Bowen House earthquake risk report imminent 17 Sep, 2019 05:00 PM 2 minutes to read Parliament Buildings, from left, Bowen House, the Beehive and Parliament House.
“If the building has an earthquake rating of less than 20 percent the risk of failure under seismic load is approximately more than 25 times the risk of failure for buildings that are 100 percent NBS,” the Ministry of Business, Innovation and Employment says on its website. But for all that, the region must be prepared to be fractured in the event of the big one. 0000005589 00000 n Mike Mendonca says the market is responding to the need for more resilient buildings and infrastructure. There is a 10 per cent chance of a 7.5 magnitude quake occurring on the Wellington Fault in the next 100 years.
13 Nov, 2012 9:09am . 0000008151 00000 n Yet, hazard is not the same as risk.
I wrote it so fast that I did not check these definitions and have mixed them up. The highest-hazard areas are where risk intersects with population – our second and third largest cities: Christchurch and Wellington” More frequent moderate-to-large earthquakes (6–7.5 magnitude) were expected from faults in the foothills of the mountains next to the Canterbury Plains, and in North Canterbury. The information provided on these maps cannot be substituted for a site speci ﬁ c investigation. It is unlikely that it will be another 80 years before another large quake occurs close to one of our cities or towns.
These emergencies have similar impacts. 0000029277 00000 n (File photo). The ministry is still getting a peer review of the assessment, which was finished in April, underway. An earthquake of magnitude 7.5 or higher could split the region up into seven "islands". The 26-year-old moved to Wellington four years ago after he "fell in love" with the city during a Contiki tour around New Zealand. “Ideally we would want to strengthen the tower to that of a new building,” the ministry told RNZ in February. Within Wellington harbour and on rivers and lakes in the region there may also be a ‘seiche’, as was observed in the harbour after the 1855 Wairarapa earthquake. Geraldine Murphy, of Inner City Wellington, says that has wiped the savings of some apartment owners; others have declined natural disaster insurance cover altogether, putting at risk their homes and investments.
Crown Copyright © 2007–2020 Ministry for Culture and Heritage, A Blog by and about Te Ara – the Encyclopedia of New Zealand, Signposts – a blog about Te Ara the Encyclopedia of New Zealand, Wellington and Christchurch’s earthquake risk, 4 September 2010 magnitude 7.1 Darfield earthquake, 1888, Hope Fault, North Canterbury, magnitude 7–7.3, ground shaking intensity 5–7, 1929, Arthur’s Pass, magnitude 7.01, ground shaking intensity 6, 2010, Darfield, magnitude 7.1, ground shaking intensity 5, http://www.gns.cri.nz/Home/News-and-Events/Media-Releases/earthquake-part-of-aftershock-sequence, Transactions and Proceedings of the Royal Society. The 2016 Kaikōura earthquake was not significant in magnitude but its long, rolling movement rattled both the people who study quakes and the engineers and architects tasked with designing houses, apartment blocks and commercial buildings strong enough to cope with them. trailer <<44aabce690e511d9b2b7000a95818a62>]>> startxref 0 %%EOF 8 0 obj<>stream
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The impacts of the ground shaking will vary around the region depending on: But we are learning all the time!”. 0000002159 00000 n We will correct. You only have to fly into the city to experience the city’s earthquake history, as the airport is built on land upraised in the Haowhenua earthquake, which probably occurred in the 15th century. As the water table is quite near the surface, many of these sands are water-saturated and when shaken turn to a jelly-like consistency. Yet, due to the multitude of faults, the return period for a very strong quake causing extreme ground shaking in Wellington is just 150 years. APNZ. The Wellington Report 2019 - six years on from the first version - takes an in-depth look across seven days at the city and region in terms of economy and employment, governance, housing, resilience, arts and hospitality, transport, and quality of life. The main threats to Wellington are from earthquakes on the Wellington Fault or the Wairarapa Fault, along with faults under Cook Strait which would likely cause a tsunami. 0000031580 00000 n
. Transport routes throughout the region may also be affected by landslides and liquefaction, so that people could be stuck at work or at school or somewhere in between. The "Germans are pretty grumpy" after two decades of losses in natural disaster insurance. But he's not too concerned about resilience issues currently gripping the city and region. New Zealand’s largest ever recorded earthquake (magnitude 8.2) occurred on the Wairarapa Fault in 1855. ", * The taniwha is coming, and he's not welcome * Kapiti Coast - a community at the sea's mercy * Act now - planning for a resilient future in Wellington * Slips, storms and flooding are on their way.
How do we know which fault is most likely to rupture next in Wellington? 0000003004 00000 n In recognition of the earthquake hazard in the Region, the Greater Wellington Regional Council has carried out studies on ground surface rupture from active faulting, ground shaking, liquefaction potential and associated ground damage, slope failure and tsunami inundation (Wellington Harbour). Reclaimed areas such as the CBD, Miramar and Petone are at high risk from liquefaction, higher ground shaking intensity and tsunami, while areas with steep slopes risk landslides. READ MORE: * Coronavirus: UK becomes second country to hit 40,000 virus deaths * National War Memorial found to be earthquake prone, silencing Carillion bells. John Morrison is a pretty relaxed fellow, despite the threat of earthquakes in his city, and the rising concern over climate change. In Wellington, office buildings are designed and built to withstand, with a high level of reliability, earthquake shaking with a return period of one in 500 years. 0000008320 00000 n Fortunately, New Zealand has a state-of-the-practice and strongly enforced building code that makes our structures well designed to cope with earthquake shaking. Thanks Chris – you are of course right. It said it did this as it worked through a draft of the detailed seismic assessment “confirming that the tower is earthquake prone”. 0000001827 00000 n Every vantage point in the city and on the nearby hills was occupied when the war memorial carillon at Wellington was dedicated on Anzac Day. “The Carillon was reopened in 2018 following refurbishment of the bell frame and some earthquake strengthening work,” the ministry said in February 2020. "The Ministry of Business, Innovation and Employment [MBIE] is helping to facilitate thinking around low-damage design," she says. The strength and location of the Darfield earthquake surprised scientists and illustrates that our knowledge of the hazards we face is evolving. 0000216850 00000 n While those measures cost more to install, they pay back "100 per cent", says resilience boss Mendonca. By any measure, the consequences of earthquakes in cities outweigh those in rural mountain areas. Many of those living and working here now face sometimes multi-million-dollar earthquake strengthening work and surges in insurance premiums. Wellingtonians know a major earthquake could flatten the city, but they choose to live here anyway. The guidelines could become mandatory after MBIE does its homework, effectively trialling them, for what's expected to be a couple of years. This Combined Earthquake hazard shapefile is a compilation of all "combined earthquake hazard" ArcInfo coverages in major urban areas of the Wellington Region. The National War Memorial Carillon in central Wellington has been rated at just 15 per cent of the earthquake code. 0000234064 00000 n
The return period is 1 in 100-300 years – the last was in 1717. 0000025101 00000 n "I still think Wellington's a really good city, and I still think mostly it is equipped to deal with earthquakes.". 0000221555 00000 n THEY SAY: Does living in Wellington give you the shakes? Then there's the $6.4 billion Let's Get Wellington Moving (LGWM) programme, designed to be adaptable to disruptions such as an earthquake. Wellingtonians are acutely aware of the city's earthquake risk, and they are helping to change how we might cope with it. So get ready. 0000010613 00000 n 0000031876 00000 n The Southern Alps may be the highest earthquake hazard in NZ but the combination of unreinforced masonry buildings in populated areas near to or on fault lines such as Christchurch or Wellington creates the highest risks – high consequences and a likelihood that is almost certain. Even though the fault is well over 100 kilometres away, the ground shaking from such a massive release of energy would still be considerable in Christchurch. Grafton says the damage to mainly modern buildings, which meant lives were saved but the properties deemed unrecoverable, should spark a rethink of not only what we design and build but also the rating system, building codes, the Earthquake Prone Building regime and the Building Act that houses it all. This illustrates that even lower-hazard areas are vulnerable – as previous ruptures on the Greendale Fault (the location of the 4 September 2010 magnitude 7.1 Darfield earthquake) do not seem to have occurred in the last 2,000 years.
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