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Research papers, University of Canterbury Library

Coastal and river environments are exposed to a number of natural hazards that have the potential to negatively affect both human and natural environments. The purpose of this research is to explain that significant vulnerabilities to seismic hazards exist within coastal and river environments and that coasts and rivers, past and present, have played as significant a role as seismic, engineering or socio-economic factors in determining the impacts and recovery patterns of a city following a seismic hazard event. An interdisciplinary approach was used to investigate the vulnerability of coastal and river areas in the city of Christchurch, New Zealand, following the Canterbury Earthquake Sequence, which began on the 4th of September 2010. This information was used to identify the characteristics of coasts and rivers that make them more susceptible to earthquake induced hazards including liquefaction, lateral spreading, flooding, landslides and rock falls. The findings of this research are applicable to similar coastal and river environments elsewhere in the world where seismic hazards are also of significant concern. An interdisciplinary approach was used to document and analyse the coastal and river related effects of the Canterbury earthquake sequence on Christchurch city in order to derive transferable lessons that can be used to design less vulnerable urban communities and help to predict seismic vulnerabilities in other New Zealand and international urban coastal and river environments for the future. Methods used to document past and present features and earthquake impacts on coasts and rivers in Christchurch included using maps derived from Geographical Information Systems (GIS), photographs, analysis of interviews from coastal, river and engineering experts, and analysis of secondary data on seismicity, liquefaction potential, geology, and planning statutes. The Canterbury earthquake sequence had a significant effect on Christchurch, particularly around rivers and the coast. This was due to the susceptibility of rivers to lateral spreading and the susceptibility of the eastern Christchurch and estuarine environments to liquefaction. The collapse of river banks and the extensive cracking, tilting and subsidence that accompanied liquefaction, lateral spreading and rock falls caused damage to homes, roads, bridges and lifelines. This consequently blocked transportation routes, interrupted electricity and water lines, and damaged structures built in their path. This study found that there are a number of physical features of coastal and river environments from the past and the present that have induced vulnerabilities to earthquake hazards. The types of sediments found beneath eastern Christchurch are unconsolidated fine sands, silts, peats and gravels. Together with the high water tables located beneath the city, these deposits made the area particularly susceptible to liquefaction and liquefaction-induced lateral spreading, when an earthquake of sufficient size shook the ground. It was both past and present coastal and river processes that deposited the types of sediments that are easily liquefied during an earthquake. Eastern Christchurch was once a coastal and marine environment 6000 years ago when the shoreline reached about 6 km inland of its present day location, which deposited fine sand and silts over this area. The region was also exposed to large braided rivers and smaller spring fed rivers, both of which have laid down further fine sediments over the following thousands of years. A significant finding of this study is the recognition that the Canterbury earthquake sequence has exacerbated existing coastal and river hazards and that assessments and monitoring of these changes will be an important component of Christchurch’s future resilience to natural hazards. In addition, patterns of recovery following the Canterbury earthquakes are highlighted to show that coasts and rivers are again vulnerable to earthquakes through their ability to recovery. This city’s capacity to incorporate resilience into the recovery efforts is also highlighted in this study. Coastal and river areas have underlying physical characteristics that make them increasingly vulnerable to the effects of earthquake hazards, which have not typically been perceived as a ‘coastal’ or ‘river’ hazard. These findings enhance scientific and management understanding of the effects that earthquakes can have on coastal and river environments, an area of research that has had modest consideration to date. This understanding is important from a coastal and river hazard management perspective as concerns for increased human development around coastlines and river margins, with a high seismic risk, continue to grow.

Audio, Radio New Zealand

Christchurch Hospital has just celebrated its 150th anniversary. The major medical facility is in the heart of the city, beside Hagley Park, and played a key role in the February earthquake, treating the many who were seriously injured. Christchurch correspondent Katy Gosset discovers the hospital faces its own quake-related challenges as it plans for the future.

Audio, Radio New Zealand

Questions to Ministers 1. PESETA SAM LOTU-IIGA to the Minister of Finance: What are some of the issues the Government will consider to meet the expected fiscal cost of the Christchurch earthquake? 2. Hon PHIL GOFF to the Prime Minister: Does he stand by his statement that, in Christchurch, "up to 10,000 houses will need to be demolished and over 100,000 more could be damaged? 3. Hon JOHN BOSCAWEN to the Attorney-General: What changes, if any, is he proposing to the Marine and Coastal Area (Takutai Moana) Bill, and why? 4. Hon DAVID CUNLIFFE to the Minister of Finance: How much of the cumulative $15 billion drop in GDP over the next 4 years, as identified in the Treasury's February Monthly Economic Indicators report, is a result of the "weaker [economic] outlook we were seeing prior to the February earthquake" in Christchurch? 5. Dr KENNEDY GRAHAM to the Minister for Canterbury Earthquake Recovery: Is he satisfied that there is enough coordination between central government agencies, local council, and non-government organisations in the response to the earthquake? 6. Hon DAVID PARKER to the Attorney-General: Is it his intention to further progress the Marine and Coastal Area (Takutai Moana) Bill this week? 7. NICKY WAGNER to the Minister for the Environment: What changes has the Government made under the Canterbury Earthquake Response and Recovery Act to facilitate recovery and the processing of resource consents to enable Christchurch to rebuild as quickly as possible? 8. Hon JIM ANDERTON to the Minister for Canterbury Earthquake Recovery: Does he stand by his comment in the House yesterday that "there is a period in which insurance companies will not provide cover", and if so, what will the Government do to assist people who have already signed purchase contracts and are seeking insurance cover? 9. JACQUI DEAN to the Minister of Police: What has been the response of the New Zealand Police and their counterparts in other countries to the Christchurch earthquake? 10. GRANT ROBERTSON to the Minister of Health: Is he satisfied with the cost of after-hours medical treatment? 11. TIM MACINDOE to the Minister of Housing: What assistance is available for people who require emergency housing following the earthquake on 22 February? 12. Hon TREVOR MALLARD to the Minister for Communications and Information Technology: Who made the decision to defer MediaWorks' payment of $43 million to the Crown?

Images, Alexander Turnbull Library

The cartoon shows the Minister for Earthquake Recovery, Gerry Brownlee, who wears a jacket with 'CERA' printed on it, reading from the 'Doomsday Book'. He reads 'The following suburbs and my hopes of a reputation as an effective minister, are now officially listed as munted...' Context - On 23rd June Prime Minister, John Key, officially announced which streets and suburbs in earthquake-ravaged Christchurch would be abandoned. For many residents, there has been too much delay and too little information regarding progress towards resolving questions about which land can or cannot be used for rebuilding for Gerry Brownlee's reputation to remain unsullied. Quantity: 1 digital cartoon(s).

Research papers, University of Canterbury Library

The Christchurch earthquake sequence has been on-going since September 4th 2010. The largest two earthquakes, magnitude (M) 7.1 on September 4th and the M 6.3 on February 22nd 2011 caused immediate and significant damage to the city of Christchurch. As a consequence of the earthquakes, the tourism sector in the Canterbury region has been heavily impacted, with broader impacts being felt throughout the South Island. Resilient Organisations and the University of Canterbury began a series of quantitative investigations into the recovery and response of key business sectors to the earthquakes. The purpose of this study was to build on this work by exploring the outcomes of the earthquakes on the tourism sector, a critical economic driver in the region. Two postal surveys were sent to 719 tourism business managers; the first to businesses in the ‘Impact Zone’ defined as areas that experienced Modified Mercalli intensities greater than 6. The second survey was sent to the remaining businesses throughout the Canterbury region (‘Rest of Canterbury’). Response rates were 46% response for the Impact Zone, and 29% for the Rest of Canterbury. Key findings:

Images, eqnz.chch.2010

One of the most beautiful pieces of wall art (added to the blank walls after buildings were demolished following the earthquakes) in Christchurch, is now being hidden by a new building in front of it. www.flickr.com/photos/johnstewartnz/15499321681/in/...

Audio, Radio New Zealand

An architect and art historian is setting up an action group to oppose the demolition of one of the most well-known churches in Christchurch, the Cathedral of the Blessed Sacrament. The church, registered as a Category 1 building with Heritage New Zealand, was damaged in the 2011 earthquakes and has sat in a state of disrepair ever since. Dr Anna Crighton is from Historic Places Aotearoa. She talks to Susie Ferguson.

Audio, Radio New Zealand

Many Christchurch trades people are refusing to carry out quake repairs unless the homeowner agrees to pay the bill, saying it takes too long to get the money out of the Earthquake Commission. Some contractors say they still haven't been paid for jobs done after the quake in September and the amount of debt some businesses are carrying are putting them in jeopardy.

Audio, Radio New Zealand

What does leadership look like in a disaster? David compares Auckland Mayor Wayne Brown's leadership this week with how Bob Parker and Lianne Dalziel coped with the Christchurch earthquakes and terror attacks. He looks at how current Christchurch mayor Phil Mauger's council is faring and whether reality meets the rhetoric and what's happened to the city's Metro Sports facility, one of the anchor projects in the rebuild.