Friday, March 29, 2013

Is Logan Glacier surging?

Three days ago we surveyed the Logan Glacier, which flows from Mt. Logan (North America's second highest mountain and Canada's highest) into the Chitina Valley. During the survey we saw signs of a surge. This glacier is not known to surge, but some unmistakable signs include very active shear margins and crevassing, and a bulge that is expected to travel down glacier over the coming months.
Shear margin with active crevasses
Ice bulge with lots of new crevasses
Paul enlists Chris' help to check the engine on his plance

A draining glacier lake left this pattern as the ice collapsed

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