A 33-million-ton block of ice sheared off a New Zealand glacier just minutes after a violent earthquake devastated the city of Christchurch, officials said Wednesday.The huge iceberg crashed into a lake shortly after the 6.3-magnitude tremor rocked the South Island on Tuesday and created waves up to three meters (10 feet) high for 30 minutes which rocked two sightseeing boats on the lake at the time.The enormous iceberg — estimated to weigh 33 to 49 million tons — began ripping off the Tasman Glacier at Aoraki Mount Cook National Park accompanied by a loud noise which sounded like a rifle shot, a local tourism official said…

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