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Reflections on the Canterbury / Christchurch Earthquakes of 4 September 2010 and 22 February 2011
Dr Vaughan Wood
photo-Gillian Needham
Summary Outline
a) Geomorphological / historical context
b) Seismological context
c) 4 September 2010 event
d) Notable aftershocks
e) 22 February 2011 event
f) Short term responses
g) Ongoing recovery & remediation
Christchurch (pop ~ 400 000)
•Tourism•Agribusiness•Regional admin.•Light industry
*
Adapted from Bedford & Sturman (eds), Canterbury at the Crossroads (1983), p 31
‘The city built on a swamp’
The Avon River in foreground and theCanterbury ProvincialCouncil building under construction in the rear (Photograph by Dr AC Barker, 1858)
Reproduced from Cookson& Dunstall (eds.) Southern Capital - Christchurch (2000), p 19
Natural vegetationin Christchurch as recorded on the ‘black maps’ in themid-1850s (i.e. at the time of the arrival of CanterburyAssociation settlers)
Reproduced from Bedford & Sturman (eds)Canterbury at the crossroads(1983), p 23
O
Reproduced from M Douglass (compiler),Christchurch City Centre:40 years of change, traffic,planning 1959-1999(2000)
Complex boundaryof Pacific plate & Indo-Australianplate
Subduction of Pacificplate off North Island, but in South Island, it ispushing up over theIndo-Australian plate,with strike-slip motionalong Alpine Fault
Reproduced from Cowan, ‘Structure, Seismicity and Tectonics of the Porter’s Pass-Amberley Fault Zone’ (Phd thesis, U of Canterbury, 1992)
Reproduced from Cowan (1992)
Adapted from Cowan (1992)
Adapted from Wards (ed.) New Zealand Atlas (1976), p 78