"‘Normal’ landslides move a horizontal distance that is fairly similar to the height drop, but landslides on top of glaciers often have an elongated runout since the ice surface has low friction,” explained Stark. In this instance, debris fell at a rapid pace for about 0.6 miles and slowed once it hit the glacier’s surface and began sliding northeast. According to Stark and Ekström’s analysis, the maximum speed of the debris was about 30 meters per second.
http://www.weather.com/science/news/yukon-canada-mount-steele-landslide-avalanche-glacier
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