Following the magnitude 6.3 Lyttelton earthquake on 22 February 2011 there were many aftershocks. Seismologists believe that the 22 February quake was itself an aftershock of the magnitude 7.1 earthquake centred on Darfield on 4 September 2010. At magnitude 6.3, the Lyttelton quake was so large that it generated its own series of aftershocks.
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Source: GeoNet
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Alan McKay (not verified)
05 o Māehe 2011
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