A group of people travel with Glacier Explorers to see one of the many icebergs that caved into Tasman Lake as a result of the 6.3 earthquake in Christchurch, New Zealand, Tuesday, February 22, 2011. The quake hit at the height of a busy workday, toppling tall buildings and churches, crushing buses and killing dozens of people in one of the country's worst natural disasters. (AP Photo/NZPA, Denis Callesen)
February 22, 2011 5:54:18 AM PST
CHRISTCHURCH, New Zealand - February 22, 2011 --
The earthquake that struck Christchurch has caused some 30 million tons of ice to break off from New Zealand's biggest glacier.