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Images, eqnz.chch.2010

Time stands still on the Science Museum clock tower as a poignant reminder of the moment the trembler struck Christchurch in the early hours of Saturday 4 September 2010.

Images, eqnz.chch.2010

Time stands still on the Science Museum clock tower as a poignant reminder of the moment the trembler struck Christchurch in the early hours of Saturday 4 September 2010.

Images, eqnz.chch.2010

Time stands still on the Science Museum clock tower as a poignant reminder of the moment the trembler struck Christchurch in the early hours of Saturday 4 September 2010.

Images, eqnz.chch.2010

Looking across the faultline where the Saturday 4 September 2010 magnitude 7.1 earthquake originated. Note how much the previously straight fence is now out of alignment.

Images, eqnz.chch.2010

Looking across the faultline where the Saturday 4 September 2010 magnitude 7.1 earthquake originated. Note how much the previously straight fence is now out of alignment.

Research papers, University of Canterbury Library

This paper provides an overview of the salient aspects of the dense array of ground motions observed in the 4 September 2010 Darfield and 22 February 2011 Christchurch earthquakes. Particular attention is given to inferred physical reasons for the observed ground motions, which include: (i) source features such as forward directivity effects; (ii) The effects of the Canterbury Plains sedimentary basin on basin-generated surface waves, and waveguide effects through the region; and (iii) the importance of local site response as evidenced by observations of large long period amplification and liquefaction. The significance of vertical ground motion intensity is also examined.