Six months after the 4 September 2010 Mw 7.1 Darfield (Canterbury) earthquake, a Mw 6.2 Christchurch (Lyttelton) aftershock struck Christchurch on the 22 February 2011. This earthquake was centred approximately 10km south-east of the Christchurch CBD at a shallow depth of 5km, resulting in intense seismic shaking within the Christchurch central business district (CBD). Unlike the 4 Sept earthquake when limited-to-moderate damage was observed in engineered reinforced concrete (RC) buildings [35], in the 22 February event a high number of RC Buildings in the Christchurch CBD (16.2 % out of 833) were severely damaged. There were 182 fatalities, 135 of which were the unfortunate consequences of the complete collapse of two mid-rise RC buildings. This paper describes immediate observations of damage to RC buildings in the 22 February 2011 Christchurch earthquake. Some preliminary lessons are highlighted and discussed in light of the observed performance of the RC building stock. Damage statistics and typical damage patterns are presented for various configurations and lateral resisting systems. Data was collated predominantly from first-hand post-earthquake reconnaissance observations by the authors, complemented with detailed assessment of the structural drawings of critical buildings and the observed behaviour. Overall, the 22 February 2011 Mw 6.2 Christchurch earthquake was a particularly severe test for both modern seismically-designed and existing non-ductile RC buildings. The sequence of earthquakes since the 4 Sept 2010, particularly the 22 Feb event has confirmed old lessons and brought to life new critical ones, highlighting some urgent action required to remedy structural deficiencies in both existing and “modern” buildings. Given the major social and economic impact of the earthquakes to a country with strong seismic engineering tradition, no doubt some aspects of the seismic design will be improved based on the lessons from Christchurch. The bar needs to and can be raised, starting with a strong endorsement of new damage-resisting, whilst cost-efficient, technologies as well as the strict enforcement, including financial incentives, of active policies for the seismic retrofit of existing buildings at a national scale.
1. Hon PHIL GOFF to the Prime Minister: Has the tax switch which he promised would leave no-one worse off fully compensated all New Zealanders for the rise in the cost of living over the last year; if not, which groups are worse off?
2. Dr RUSSEL NORMAN to the Minister of Finance: Does he agree that due to inflation, no new spending in the upcoming Budget is the equivalent of a cut in real terms?
3. DAVID BENNETT to the Minister of Finance: What tax changes take effect on or around 1 April?
4. Hon DAVID CUNLIFFE to the Minister of Finance: Why did he announce on 17 March 2011 that the Government would carry all the costs of earthquake reconstruction on its balance sheet with no reduction in operating spending, when the Prime Minister said just three days later that new operating spending would be reduced to zero?
5. AARON GILMORE to the Minister of Education: What progress has been made re-opening schools and early childhood education centres in Christchurch following the 22 February earthquake?
6. CHARLES CHAUVEL to the Minister of Civil Defence: To date, how many buildings have been demolished in Canterbury without notifications to the building or business owners?
7. HONE HARAWIRA to the Attorney-General: Is he satisfied that he has the support required for the Marine and Coastal Area (Takutai Moana) Bill to pass into law?
8. DARIEN FENTON to the Minister of Labour: What impact, if any, will the Christchurch earthquake have on the Government's employment law changes due to be implemented on 1 April?
9. JONATHAN YOUNG to the Minister of Corrections: What progress has been made toward the implementation of the smoking ban in New Zealand prisons?
10. CLARE CURRAN to the Minister for Communications and Information Technology: By what date will the 75 percent of urban New Zealanders receive ultra-fast broadband under his current proposal?
11. METIRIA TUREI to the Prime Minister: Does he stand by his statement that the "Government will build the effectiveness of New Zealand's public transport networks" and "will be working closely with the Auckland Council as they develop their strategic vision for the City through the Auckland Spatial Plan"?
12. TODD McCLAY to the Minister for Social Development and Employment: What counselling support is available for Cantabrians impacted by the earthquake?
Questions to Ministers
1. Hon RODNEY HIDE to the Acting Minister of Energy and Resources: Does she accept her Ministry's advice that the value of New Zealand's onshore minerals excluding hydrocarbons is $194 billion overall with $80 billion estimated in Schedule 4 land; if so, what plans does the Government have to allow their development?
2. Hon PHIL GOFF to the Minister for the Rugby World Cup: What advice has the Prime Minister, the Government or Rugby New Zealand 2011 been given on Christchurch's ability to host Rugby World Cup matches later this year?
3. CHESTER BORROWS to the Minister of Finance: What reports has he received on the economy's prospects after New Zealand meets the immediate challenges of the Christchurch earthquake?
4. Hon DAVID CUNLIFFE to the Minister for Communications and Information Technology: Would he indicate his agreement to a further extension, if it were required, to the report back date for the Telecommunications (TSO, Broadband and Other Matters) Amendment Bill?
5. TE URUROA FLAVELL to the Minister of Agriculture: Is he concerned to learn that New Zealand's first majority Māori-owned dairy company, Miraka, has reportedly stated that there is a serious risk that Fonterra's proposed Trading Among Farmers exchange will be illiquid, volatile and unstable; if so, what assurances can he give Miraka and other dairy processors and industry groups, that anti-competitive behaviour will not be tolerated?
6. Hon DAVID PARKER to the Acting Minister for Economic Development: Has he been advised by the Prime Minister whether his appointment as Acting Minister for Economic Development is temporary or expected to carry on to the election?
7. JO GOODHEW to the Minister of Education: What progress has been made on re-opening Christchurch schools and early childhood education centres since the 22 February earthquake?
8. GRANT ROBERTSON to the Minister of Health: Does he favour the sale of any public hospitals in New Zealand; if so, which one or ones?
9. SIMON BRIDGES to the Minister for Building and Construction: What advice has he received from the Department of Building and Housing regarding last month's Christchurch earthquake?
10. DARIEN FENTON to the Minister of Labour: What factors did she consider in deciding to increase the minimum wage by 25 cents from 1 April in her latest review?
11. CHRIS TREMAIN to the Minister of Transport: What progress has been made on roading projects in the Hawke's Bay region?
12. GARETH HUGHES to the Minister of Finance: What steps, if any, is he taking to reduce New Zealand's economic vulnerability that stems from dependence on oil?
Questions to Members
1. Hon DAVID CUNLIFFE to the Chairperson of the Finance and Expenditure Committee: How many submissions have been received so far on the Telecommunications (TSO, Broadband and Other Matters) Amendment Bill?
2. Hon DAVID CUNLIFFE to the Chairperson of the Finance and Expenditure Committee: How many submitters on the Telecommunications (TSO, Broadband and Other Matters) Amendment Bill have requested an oral hearing?
3. Hon DAVID CUNLIFFE to the Chairperson of the Finance and Expenditure Committee: Is he aware of any complaints about times allocated to submitters on the Telecommunications (TSO, Broadband and Other Matters) Amendment Bill?
