I am a Christchurch resident who has experienced all the significant quakes from 4 September 2010 up to the recent tragic event of 22 February 2011.
Like many others I have a strong interest in understanding these tremors.
Here is the latest comprehensive report on this shake:
http://en.wikipedia.org/wiki/2011_Christchurch_earthquake
Couple of interesting points:
Peak Ground Acceleration in one location of 2.2gs
and 30 million tonnes of ice broke off from Tasman Glacier.
Cheers : Ian Mc
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