CHRISTCHURCH, New Zealand — The 6.3 magnitude earthquake that struck Christchurch on Tuesday caused some 30 million tons of ice to break off from New Zealand's biggest glacier.
Tour guides at the Tasman Glacier in the Southern Alps said the quake caused the ice to "calve" from the glacier, forming icebergs in the terminal lake.
Tourists of Glacier Explorer boats said the icefall caused waves of up to 3.5 meters in height which swept up and down the lake for 30 minutes.
The glacier is about 120 miles (200 kilometers) from Christchurch on the west coast.
The powerful earthquake killed at least 65 people.