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Research papers, University of Canterbury Library

This study contains an evaluation of the seismic hazard associated with the Springbank Fault, a blind structure discovered in 1998 close to Christchurch. The assessment of the seismic hazard is approached as a deterministic process in which it is necessary to establish: 1) fault characteristics; 2) the maximum earthquake that the fault is capable of producing and 3) ground motions estimations. Due to the blind nature of the fault, conventional techniques used to establish the basic fault characteristics for seismic hazard assessments could not be applied. Alternative methods are used including global positioning system (GPS) surveys, morphometric analyses along rivers, shallow seismic reflection surveys and computer modelling. These were supplemented by using multiple empirical equations relating fault attributes to earthquake magnitude, and attenuation relationships to estimate ground motions in the near-fault zone. The analyses indicated that the Springbank Fault is a reverse structure located approximately 30 km to the northwest of Christchurch, along a strike length of approximately 16 km between the Eyre and Ashley River. The fault does not reach the surface, buy it is associated with a broad anticline whose maximum topographic expression offers close to the mid-length of the fault. Two other reverse faults, the Eyrewell and Sefton Faults, are inferred in the study area. These faults, together with the Springbank and Hororata Faults and interpreted as part of a sys of trust/reverse faults propagating from a decollement located at mid-crustal depths of approximately 14 km beneath the Canterbury Plains Within this fault system, the Springbank Fault is considered to behave in a seismically independent way, with a fault slip rate of ~0.2 mm/yr, and the capacity of producing a reverse-slip earthquake of moment magnitude ~6.4, with an earthquake recurrence of 3,000 years. An earthquake of the above characteristics represents a significant seismic hazard for various urban centres in the near-fault zone including Christchurch, Rangiora, Oxford, Amberley, Kaiapoi, Darfield, Rollestion and Cust. Estimated peak ground accelerations for these towns range between 0.14 g to 0.5 g.

Images, UC QuakeStudies

A photograph looking north up Liverpool Street from the intersection with Cashel Street. On the right, a pile of collapsed scaffolding can be seen on the road and two excavators are demolishing a building in the distance.

Images, UC QuakeStudies

Dried liquefaction silt in North New Brighton. The photographer comments, "The day before this was liquefaction pouring out of the ground, but within a day it has dried up and will soon turn into a gritty dust".

Images, UC QuakeStudies

A photograph looking north down Manchester Street. Coloured shipping containers have been stacked in front of the remaining facade of the Excelsior Hotel building on the right and empty building sites on the left are fenced off.

Images, UC QuakeStudies

Members of the Shirley community relaxing around a table set up by the World Mission Society Church of God on North Parade in Shirley. A member of the church can be seen holding a sign advertising free sausages.

Articles, Christchurch uncovered

In the beginning there was no Te Wai Pounamu or Aotearoa. The waters of Kiwa rolled over the place now occupied by the South Island, the North Island and Stewart Island. No sign of land existed. Before Raki (the Sky … Continue reading →

Images, UC QuakeStudies

Liquefaction and buckled tarmac on a residential street in North New Brighton. The photographer comments, "In the February 2011 earthquake in Christchurch the kerb at the end of my road was pushed from both ends. This caused it to move away from the grass verge and push itself under the tarmac. The tarmac would normally have been 3 inches below the top of the kerb. Between the kerb and the grass can be seen the colour of the liquefaction that spewed out from the ground. The tarmac in the area seemed to flow downhill".

Images, UC QuakeStudies

A photograph looking east down London Street from the north-west corner of the London and Canterbury Street intersection. The Volcano Cafe, Lava Bar, and Lyttelton Fisheries have been demolished on the left side of the street, leaving vacant sites.

Audio, Radio New Zealand

Since the February 22nd earthquake, an influx of displaced Christchurch residents have made North Canterbury their temporary home. Cosmo Kentish-Barnes finds out how some people have coped with this dramatic event and what locals are doing to support them.