Outdoors
OUTDOORS Geophysical Institute, University of Alaska Fairba One month ago, I wrote about a dramatic landscape feature in western Alaska called the Selawik Slump. The slump, caused by thawing permafrost, looks like a bomb crater leaking mud from the boreal forest into a clear northern river. There are dozens of them in northern Alaska, though none as big as the one on the Selawik River.

Thaw scars widespread across the northland

On the South MacMillan River in the Yukon Territory, the Surprise Rapids retrogressive thaw slump may have started flowing after a forest fire in the 1870s.
Photo Courtesy Of Panya Lipovsky
On the South MacMillan River in the Yukon Territory, the Surprise Rapids retrogressive thaw slump may have started flowing after a forest fire in the 1870s.
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