New Zealand quake frees glacier ice
2011-02-23 08:27
Wellington - The 6.3-magnitude earthquake that struck New Zealand on Tuesday, killing at least 75 people in Christchurch, also shook loose 30 million tons of ice from the nation's longest glacier, sending boulders of ice into a nearby lake.
Tour boat operators in the area said parts of the Tasman Glacier calved into the Tasman Lake immediately after the quake, breaking into smaller icebergs and causing 3.5m waves.
"It was approximately 30 million tons of ice, it's just a massive, massive, massive scale," said Denis Callesen, the general manager of tourism at Aoraki Mount Cook Alpine Village.
He added the ice fall or 'calving' was expected, given the large amount of recent rain, the changing of the dynamics of the lake and the La Niña weather phenomenon, a factor in higher levels of rainfall. Calving is the breaking away of a mass of ice from a glacier.
"We have known for some weeks that an event was coming, what is just a complete curve ball, left field, is that it was the earthquake that set it off and caused the calving," said Callesen.
Callesen added that icebergs now cover a quarter of the 5km by 2km Tasman Lake, which is about 200km west of Christchurch on New Zealand's South Island.