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Images for Earthquakes; more images...

Images, eqnz.chch.2010

Porritt Park was, before the earthquakes, the headquarters of hockey in this region. Two astro-turf fields (the main one was to the left of the building), and corporate offices etc. The earthquakes buckled all the playing surfaces and damaged the buildings; a couple of smaller ones have been removed. Hockey shifted the other side of the cit...

Videos, UC QuakeStudies

A video of a presentation by Dr Sarah Beaven during the Social Recovery Stream of the 2016 People in Disasters Conference. The presentation is titled, "Leading and Coordinating Social Recovery: Lessons from a central recovery agency".The abstract for this presentation reads as follows: This presentation provides an overview of the Canterbury Earthquake Recovery Authority's Social Recovery Lessons and Legacy project. This project was commissioned in 2014 and completed in December 2015. It had three main aims: to capture Canterbury Earthquake Recovery Authority's role in social recovery after the Canterbury earthquakes, to identify lessons learned, and to disseminate these lessons to future recovery practitioners. The project scope spanned four Canterbury Earthquake Recovery Authority work programmes: The Residential Red Zone, the Social and Cultural Outcomes, the Housing Programme, and the Community Resilience Programme. Participants included both Canterbury Earthquake Recovery Authority employees, people from within a range of regional and national agencies, and community and public sector organisations who worked with Canterbury Earthquake Recovery Authority over time. The presentation will outline the origin and design of the project, and present some key findings.

Videos, UC QuakeStudies

A video of a presentation by Jane Morgan and Annabel Begg during the Social Recovery Stream of the 2016 People in Disasters Conference. The presentation is titled, "Monitoring Social Recovery in Greater Christchurch".The abstract for this presentation reads as follows: This presentation provides an overview of the Canterbury Earthquake Recovery Authority's Social Recovery Lessons and Legacy project. This project was commissioned in 2014 and completed in December 2015. It had three main aims: to capture Canterbury Earthquake Recovery Authority's role in social recovery after the Canterbury earthquakes, to identify lessons learned, and to disseminate these lessons to future recovery practitioners. The project scope spanned four Canterbury Earthquake Recovery Authority work programmes: The Residential Red Zone, the Social and Cultural Outcomes, the Housing Programme, and the Community Resilience Programme. Participants included both Canterbury Earthquake Recovery Authority employees, people from within a range of regional and national agencies, and community and public sector organisations who worked with Canterbury Earthquake Recovery Authority over time. The presentation will outline the origin and design of the project, and present some key findings.

Audio, Radio New Zealand

NUK KORAKO to the Minister of Finance: How does New Zealand’s growing economy and the Government’s commitment to responsible fiscal management mean New Zealand is well-placed to respond to the Kaikōura earthquake? ANDREW LITTLE to the Prime Minister: Has he spoken to relevant Ministers about the lessons learned from the Canterbury earthquakes to ensure people affected by the recent earthquakes have an easier and faster recovery? STUART SMITH to the Minister of Civil Defence: What update can he provide about the Government’s response to the Kaikōura earthquake? RON MARK to the Prime Minister: Can he update the House on the situation in quake-affected areas in the South Island? JAMES SHAW to the Prime Minister: Is he committed to all his Government’s policies? Hon ANNETTE KING to the Minister of Health: Does he stand by his statement that following the Valentine’s Day earthquake this year in Canterbury, “it was timely to review whether any additional mental health and wellbeing support was needed”; if so, will he consider reviewing whether any additional support is needed for Canterbury and Nelson-Marlborough district health boards as a result of the recent earthquakes? JACQUI DEAN to the Minister of Transport: What updates has he received on damage to transport infrastructure following the Kaikōura earthquake? JAN LOGIE to the Minister for Workplace Relations and Safety: What is his response to yesterday’s call from members of the Joint Working Group on Pay Equity Principles for the Government to “immediately right this historic wrong and implement the JWG principles”? JACINDA ARDERN to the Minister for Economic Development: When is he likely to announce a recovery or support package for small businesses in earthquake-affected areas? KANWALJIT SINGH BAKSHI to the Minister of Police: What are New Zealand Police doing to support the Kaikōura community? CHRIS HIPKINS to the Minister of Education: When did she first discuss the potential impact of Monday’s 7.5 earthquake on NCEA and Scholarship exams with the New Zealand Qualifications Authority? IAN McKELVIE to the Minister for Primary Industries: What recent reports has he received on the impact of the recent earthquakes on the primary sector?

Research papers, Victoria University of Wellington

The last seven years have seen southern New Zealand a ected by several large and damaging earthquakes: the moment magnitude (MW) 7.8 Dusky Sound earthquake on 15 July 2009, the MW 7.1 Dar eld (Canterbury) earthquake on 4 September 2010, and most notably the MW 6.2 Christchurch earthquake on 22 February 2011 and the protracted aftershock sequence. In this thesis, we address the postseismic displacement produced by these earthquakes using methods of satellite-based geodetic measurement, known as Interferometric Synthetic Aperture Radar (InSAR) and Global Positioning System (GPS), and computational modelling.  We observe several ground displacement features in the Canterbury and Fiordland regions during three periods: 1) Following the Dusky Sound earthquake; 2) Following the Dar eld earthquake and prior to the Christchurch earthquake; and 3) Following the Christchurch earthquake until February 2015.  The ground displacement associated with postseismic motion following the Dusky Sound earthquake has been measured by continuous and campaign GPS data acquired in August 2009, in conjunction with Di erential Interferometric Synthetic Aperture Radar (DInSAR) observations. We use an afterslip model, estimated by temporal inversion of geodetic data, with combined viscoelastic rebound model to account for the observed spatio-temporal patterns of displacement. The two postseismic processes together induce a signi cant displacement corresponding to principal extensional and contractual strain rates of the order of 10⁻⁷ and 10⁻⁸ yr⁻¹ respectively, across most of the southern South Island.  We also analyse observed postseismic displacement following the Dusky Sound earthquake using a new inversion approach in order to describe afterslip in an elasticviscoelastic medium. We develop a mathematical framework, namely the "Iterative Decoupling of Afterslip and Viscoelastic rebound (IDAV)" method, with which to invert temporally dense and spatially sparse geodetic observations. We examine the IDAV method using both numerical and analytical simulations of Green's functions.  For the post-Dar eld time interval, postseismic signals are measured within approximately one month of the mainshock. The dataset used for the post-Dar eld displacement spans the region surrounding previously unrecognised faults that ruptured during the mainshock. Poroelastic rebound in a multi-layered half-space and dilatancy recovery at shallow depths provide a satisfactory t with the observations.  For the post-Christchurch interval, campaign GPS data acquired in February 2012 to February 2015 in four successive epochs and 66 TerraSAR-X (TSX) SAR acquisitions in descending orbits between March 2011 and May 2014 reveal approximately three years of postseismic displacement. We detect movement away from the satellite of ~ 3 mm/yr in Christchurch and a gradient of displacement of ~ 4 mm/yr across a lineament extending from the westernmost end of the Western Christchurch Fault towards the eastern end of the Greendale East Fault. The postseismic signals following the Christchurch earthquake are mainly accounted for by afterslip models on the subsurface lineament and nearby faults.

Research papers, The University of Auckland Library

In the aftermath of the 2010-2011 Canterbury earthquakes in New Zealand, the residual capacity and reparability of damaged reinforced concrete (RC) structures was an issue pertinent to building owners, insurers, and structural engineers. Three precast RC moment-resisting frame specimens were extracted during the demolition of the Clarendon Tower in Christchurch after sustaining earthquake damage. These specimens were subjected to quasi-static cyclic testing as part of a research program to determine the reparability of the building. It was concluded that the precast RC frames were able to be repaired and retrofitted to an enhanced strength capacity with no observed reduction in displacement capacity, although the frames with “shear-ductile” detailing exhibited less displacement ductility capacity and energy dissipation capacity than the more conventionally detailed RC frames. Furthermore, the cyclic test results from the earthquake-damaged RC frames were used to verify the predicted inelastic demands applied to the specimens during the 2010-2011 Canterbury earthquakes. https://www.concrete.org/publications/acistructuraljournal.aspx

Images, eqnz.chch.2010

Porritt Park was, before the earthquakes, the headquarters of hockey in this region. Two astro-turf fields (the main one was other side of the building), and corporate offices etc. The earthquakes buckled all the playing surfaces and damaged the buildings; a couple of smaller ones have been removed. Hockey shifted the other side of the city t...

Research papers, University of Canterbury Library

We present ground motion simulations of the Porters Pass (PP) fault in the Canterbury region of New Zealand; a major active source near Christchurch city. The active segment of the PP fault has an inferred length of 82 km and a mostly strike-slip sense of movement. The PP fault slip makes up approximately 10% of the total 37 mm/yr margin-parallel plate motion and also comprises a significant proportion of the total strain budget in regional tectonics. Given that the closest segment of the fault is less than 45 km from Christchurch city, the PP fault is crucial for accurate earthquake hazard assessment for this major population centre. We have employed the hybrid simulation methodology of Graves and Pitarka (2010, 2015), which combines low (f<1 Hz) and high (f>1 Hz) frequencies into a broadband spectrum. We have used validations from three moderate magnitude events (𝑀𝑤4.6 Sept 04, 2010; 𝑀𝑤4.6 Nov 06, 2010; 𝑀𝑤4.9 Apr 29, 2011) to build confidence for the 𝑀𝑤 > 7 PP simulations. Thus far, our simulations include multiple rupture scenarios which test the impacts of hypocentre location and the finite-fault stochastic rupture representation of the source itself. In particular, we have identified the need to use location-specific 1D 𝑉𝑠/𝑉𝑝 models for the high frequency part of the simulations to better match observations.