25 Feb 2014:
Massive Alaska Avalanche
Depicted in NASA Satellite Photograph
Southeastern Alaska recently experienced the largest landslide the planet has seen since 2010, and the aftermath is captured in this NASA satellite image. Triggered by the collapse of a near-vertical mountain face on the flanks of Mount La Perouse, 75 million tons of snow and sediment formed a debris flow nearly five miles long. The avalanche material appears light brown in contrast to the snow in the photo. Researchers at Columbia University first detected the event when seismic records from the region showed a large number of low-frequency waves; this satellite image and other aerial photos confirmed their hunch. The American Geophysical Union also posted this blog featuring photographs from an Alaskan pilot who flew over the landslide.