An Example of Short Period Glacial Activity

Landslide at Mt. Steele

An avalanche/landslide has occurred at Mt. Steele, Yukon, CAN
http://earthobservatory.nasa.gov/IOTD/view.php?id=86826&eocn=home&eoci=iotd_title

here is another map of the area for comparison:
http://mapcarta.com/24511312

While most Glacial activity is at a slow snail-like pace, material transport, undercutting, and ice accumulation often leads to unstable slopes:

There was no earthquake or other obvious trigger for the avalanche. 
“Very large landslides like this often have very ambiguous triggers,”
said Stark. “Failure takes place because of a long-term accumulation 
of stress within the rock slope and a long-term weakening of the 
rock. A hair-trigger is often all that is needed.”
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