There are many puzzles as to why some of Christchurch’s buildings have survived the 6.3 earthquake of February 2011, and others have not. However, a combination of observations plus document-searching does provide some answers. In terms of magnitude, this was just a moderate earthquake, but the local effects on Christchurch have been huge because of its proximity and shallowness. Even within Christchurch, location was of huge importance, but there is more to it than that.
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thebarefootchroniclesofus 
Really well written.
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