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

 

Also, Loan Interest: Productivity Commission On Tertiary Education

Key recommendations include better quality control; making it easier for students to transfer between courses; abolishing University Entrance; enabling tertiary institutions to own and control their assets; making it easier for new providers to enter the system; and facilitating more and faster innovation by tertiary education providers... More>>

ALSO:

Higher Payments: Wellington Regional Council Becomes A Living Wage Employer

Councillor Sue Kedgley said she was delighted that the Wellington Regional Council unanimously adopted her motion to become a Living Wage employer, making it the first regional council in New Zealand to do so. More>>

ALSO:

Scoop Images:
Dame Patsy Reddy Sworn In As Governor-General

This morning Dame Patsy Reddy was sworn in as the New Zealand Realm’s 21st Governor-General. The ceremony began with a pōwhiri to welcome Dame Patsy and her husband Sir David Gascoigne to Parliament. More>>

ALSO:

Ruataniwha: DOC, Hawke's Bay Council Developer Take Supreme Court Appeal

The Department of Conservation and Hawke's Bay Regional Investment Company (HBRIC) are appealing to the Supreme Court over a conservation land swap which the Court of Appeal halted. More>>

ALSO:

With NZ's Marama Davidson: Women’s Flotilla Leaves Sicily – Heading For Gaza

Women representing 13 countries spanning five continents began their journey yesterday on Zaytouna-Oliva to the shores of Gaza, which has been under blockade since 2007. On board are a Nobel Peace Laureate, three parliamentarians, a decorated US diplomat, journalists, an Olympic athlete, and a physician. A list of the women with their background can be found here. More>>

Gordon Campbell: On The Key Style Of Crisis Management

At Monday’s post Cabinet press conference Key was in his finest wide- eyed “Problem? What problem?” mode. No, there wasn’t really a problem that top MPI officials had been at odds with each other over the meaning of the fisheries policy and how that policy should be pursued... More>>

ALSO:

Mt Roskill: Greens Will Not Stand In Likely Post-Goff By-Election

“The Green Party’s priority is changing the Government in 2017, and as part of that we’ve decided that we won’t stand a candidate in the probable Mt Roskill by-election... This decision shows the Memorandum of Understanding between Labour and the Green Party is working." More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news