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Research papers, The University of Auckland Library

In the early morning of 4th September 2010 the region of Canterbury, New Zealand, was subjected to a magnitude 7.1 earthquake. The epicentre was located near the town of Darfield, 40 km west of the city of Christchurch. This was the country’s most damaging earthquake since the 1931 Hawke’s Bay earthquake (GeoNet, 2010). Since 4th September 2010 the region has been subjected to thousands of aftershocks, including several more damaging events such as a magnitude 6.3 aftershock on 22nd February 2011. Although of a smaller magnitude, the earthquake on 22nd February produced peak ground accelerations in the Christchurch region three times greater than the 4th September earthquake and in some cases shaking intensities greater than twice the design level (GeoNet, 2011; IPENZ, 2011). While in September 2010 most earthquake shaking damage was limited to unreinforced masonry (URM) buildings, in February all types of buildings sustained damage. Temporary shoring and strengthening techniques applied to buildings following the Darfield earthquake were tested in February 2011. In addition, two large aftershocks occurred on 13th June 2011 (magnitudes 5.7 and 6.2), further damaging many already weakened structures. The damage to unreinforced and retrofitted clay brick masonry buildings in the 4th September 2010 Darfield earthquake has already been reported by Ingham and Griffith (2011) and Dizhur et al. (2010b). A brief review of damage from the 22nd February 2011 earthquake is presented here

Research papers, The University of Auckland Library

This paper presents preliminary field observations on the performance of selected steel structures in Christchurch during the earthquake series of 2010 to 2011. This comprises 6 damaging earthquakes, on 4 September and 26 December 2010, February 22, June 6 and two on June 13, 2011. Most notable of these was the 4 September event, at Ms7.1 and MM7 (MM as observed in the Christchurch CBD) and most intense was the 22 February event at Ms6.3 and MM9-10 within the CBD. Focus is on performance of concentrically braced frames, eccentrically braced frames, moment resisting frames and industrial storage racks. With a few notable exceptions, steel structures performed well during this earthquake series, to the extent that inelastic deformations were less than what would have been expected given the severity of the recorded strong motions. Some hypotheses are formulated to explain this satisfactory performance. http://db.nzsee.org.nz/SpecialIssue/44%284%290297.pdf

Audio, Radio New Zealand

Questions to Ministers 1. Hon PHIL GOFF to the Prime Minister: Is he satisfied that actions to address the Christchurch earthquake are an adequate response; if not, what are his areas of concern? 2. AMY ADAMS to the Minister of Finance: What reports has he received on the economic impact of the earthquake in Christchurch on 22 February 2011? 3. Hon CLAYTON COSGROVE to the Minister for Canterbury Earthquake Recovery: Is he satisfied with the level of support being offered to the people of Christchurch in the wake of the earthquake on 22 February 2011? 4. NICKY WAGNER to the Minister for Social Development and Employment: What is the Government doing to support Canterbury businesses and employees through the earthquake recovery? 5. Hon ANNETTE KING to the Minister for Social Development and Employment: Is she confident that the Ministry of Social Development has responded adequately to the Christchurch earthquake? 6. METIRIA TUREI to the Minister of Finance: Has he considered raising a temporary levy on income to help fund the rebuilding of Christchurch; if so, how much could it raise? 7. AARON GILMORE to the Minister for Tertiary Education: What work has been done to help the families of tertiary students and tertiary institutions affected by the 22 February 2011 earthquake in Christchurch? 8. Hon JIM ANDERTON to the Minister for Canterbury Earthquake Recovery: Will he ensure that Christchurch homeowners and businesses are able to access insurance cover from existing policies or new cover they require since the 22 February 2011 earthquake? 9. Hon JOHN BOSCAWEN to the Attorney-General: Has he asked the Māori Party to agree to amendments to the Marine and Coastal Area (Takutai Moana) Bill that would make it explicitly clear that customary title holders would not be able to charge individuals for accessing a beach, and require any negotiated settlements to be referred back to Parliament for validation; if so, what response did he receive? 10. Hon DAVID PARKER to the Attorney-General: Does the Government intend to proceed this week with its legislation to replace the existing Foreshore and Seabed Act 2004? 11. RAHUI KATENE to the Minister for Canterbury Earthquake Recovery: Did he agree with his spokesman's response to the situation for residents in Christchurch East following the earthquake of 22 February 2011, that, "It is apparent, given the scale out there, that there just wasn't sufficient hardware out there, loos and the like", and what urgent actions have been taken to give priority to communities in the eastern suburbs? 12. COLIN KING to the Minister of Civil Defence: Why was a state of national emergency declared on 23 February 2011?