June 13, 2011: A second strong aftershock hit Christchurch today following a 5.5 earthquake in the morning.
The aftershock measured 5.5, was 11km deep and 10km southeast of Christchurch. It struck at 1pm (local time) and lasted for about 30 seconds.
The first shock was followed by a second aftershock about nine minutes later.
This video by 3 news.co.za.
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