BBC News - New Zealand earthquake: Depth and location key
BBC News - New Zealand earthquake: Depth and location key:
"But whereas last year's quake caused much less damage and no deaths, the natural disaster that struck the city on 22 February looks set to go down in the record books as one of the most catastrophic in New Zealand's history.
The critical difference on this occasion is that the ground broke almost directly under the country's second city, and at shallow depth."
The critical difference on this occasion is that the ground broke almost directly under the country's second city, and at shallow depth."
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