Causes
6.3 magnitude
10km west of Christchurch, 4:35pm Pacific Plate is moving towards, and being subducted below the Australian Plate, Greendale fault zone
Aftershock of the 2010 Sep quake

Primary Impacts - Environmental
Liquefaction in the suburbs produced 400,000 tones of silt

Immediate Responses
Search and rescue teams active within the first few hours
Back up facilities like toilets and water were available soon after
International aid was provided $9 million, as well as aid workers
Buildings were safety zoned