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Darfield Earthquake Case Study


Type of hazard Earthquake
Plate Boundary Part collisional part conservative IndoAustralian and
Pacific Plates
Date of event September 2010
Location Darfield, New Zealand
Economic development MEDC




Causes 7.1 magnitude
Up to 9 on the Mercalli Scale
6 mile deep focus
Epicentre 25 miles west of Christchurch…

Page 2

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Strike slip fault movement of 4m, 55km from the main
collision boundary
4 earthquakes between 1850 and 1922
Underlying geology ­ alluvium deposits which is prone to
liquefaction
Soil compaction in 2005 at Pegasus Town costed $20
million (NZD) and prevented liquefaction
Formal building regulations have been in place since…

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