Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


Christchurch has suffered liquefaction in the past

Christchurch has suffered liquefaction in the past, new research shows

March 5, 2014

Fresh research has found Christchurch has previously experienced liquefaction in an earthquake, most likely the 1869 Christchurch earthquake.

The June 5, 1869 Christchurch earthquake of about magnitude 4.8 or larger, was centred under Addington and caused significant damage. Geologist Julius von Haast, who had lived in Canterbury since 1859, described the earthquake as the most severe he had ever felt in the region.

University of Canterbury (UC) PhD researcher Sarah Bastin found evidence of historic liquefaction in Christchurch. She has discovered data showing liquefaction, indicating previous earthquakes in the region have repeatedly impacted the Christchurch area.

Bastin has won the best student paper awards at the New Zealand Geotechnical Society Conference in Queenstown and she was awarded the Wellman research award at the society’s conference in Christchurch. Her research is supervised by UC’s Associate Professor Mark Quigley and senior lecturer Dr Kari Bassett.

Bastin has been invited to work with global experts on liquefaction in the USA and has published several research papers in high profile international journals.

``Liquefaction in 1869 is a key finding of my PhD research. Prior to my work this had not been known or documented.

``The historical liquefaction aligns with recent liquefaction indicating the areas affected by the 2010 and 2011 earthquakes are likely to be affected by more liquefaction in future events

``If we get more earthquakes we will get liquefaction and we will get liquefaction in the same areas. The alignment of modern and old features indicates that the areas previously vulnerable are still susceptible.

``Essentially, Christchurch can expect an earthquake that will cause liquefaction every 150 years. We do not expect this to be as large as the February 2011 event. When rebuilding Christchurch we have to recognise that parts of the city are highly susceptible to liquefaction therefore must plan for this accordingly.

``In TC3 areas they are doing this to some extent. However, I think it is important to note that the city has to evolve to address these issues otherwise we are doomed to repeat this costly lesson.

``As an example, the Cathedral spire was repaired from earthquake damage in 1881, 1888, 1901, 1922 indicating earthquakes pose a real hazard to the city. It is important we consider this when rebuilding as opposed to the old fixing the old mentality.’’

Trenching across liquefaction features within Avonside, eastern Christchurch, revealed multiple generations of liquefaction dikes. This indicates that recurrent liquefaction in 2011 occurred in the same zones of weakness as in the past, Bastin says.

``Many of New Zealand’s main urban centres are located near mapped and unmapped faults and are situated on sediments that are considered highly liquefiable.’’

Ends

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Gordon Campbell:
On The Last Rites For The TPP

The Trans Pacific Partnership trade deal is one of those litmus issues that has always had more to do with one’s place on the political spectrum than with any imminent reality.

To date, the Greens have opposed (a) a wide range of the leaked content of the TPP (b) the secretive way it has been negotiated and (c) the undemocratic way in which any final document would be ratified. Labour has shared some of those concerns, but while remaining generally supportive of the deal itself.

National has, for its part, been very enthusiastic about the TPP, while still giving assurances about Pharmac being protected... For the TPP’s friends and foes alike though, the end now seems nigh. More>>

 
 

Gordon Campbell: On The Farcical Elevation Of David Seymour

With the election won, it’s time to find jobs for the boy. David Seymour is the Act Party’s latest scrounger to be rewarded by the National Party, and not only with a seat in Parliament. More>>

ALSO:

As Key Mulls Joining ISIS Fighting: McCully Speech To UN Backs Security Council Bid

It is an honour to address you today on behalf of the Prime Minister and Government of New Zealand. Our General Election took place last week - our Prime Minister Rt Hon John Key is engaged in forming a government and that is why he is unable to be here in New York... More>>

ALSO:

Labour: Cunliffe Triggers Party Wide Leadership Contest

David Cunliffe has resigned as Labour Leader, but says he will seek re-election... If there is any contest the election will have to go through a process involving the party membership and union affiliates. More>>

ALSO:

Flyover Appeal: Progress And Certainty, Or Confusion And More Delays?

Lindsay Shelton: The Transport Agency, embarrassed by the rejection of its flyover alongside the Basin Reserve, says it’s appealing because the decision could “constrain progress.” Yet for most clear-sighted Wellingtonians a 300-metre-long concrete structure above Kent and Cambridge Terraces would in no way be seen as progress… More>>

ALSO:

Gordon Campbell: On Cunliffe’s Last Stand

Right now, embattled Labour leader David Cunliffe has three options. None of them are particularly attractive for him personally, or for the Labour Party... More>>

ALSO:

Key Seeking 'New Ideas': Look To Children’s Commissioner On Poverty - Greens

John Key should not reinvent the wheel when it comes to ideas for tackling child poverty, and instead look to the recommendations of the Children’s Commissioner’s Expert Group on Child Poverty, Green Party co-leader Metiria Turei says. More>>

ALSO:

'Safe To Re-Enter' - OIA Docs: Safety Is Absolute Priority At Pike River Mine

“We understand that the time it is taking to complete our evaluation of the risks is frustrating for the family members and we are trying to complete this work as quickly as we can,” Ms Dunphy says. “It is Solid Energy’s responsibility to make this decision and we will do so, once we have all the information required to make a fully-informed decision.” More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
More RSS  RSS
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news