Human-triggered Avalanche

Raven Eye Photography

Two ski tracks on the left of the photo show where skiers entered the slope and triggered an avalanche.

These are avalanches triggered by a person or machine. The majority of avalanches that involve a person are triggered either by the victim or a member of their party, and 90% of fatal avalanche incidents are human-triggered. An avalanche is considered to be machine-triggered if the person triggering is on a snowmobile or other motorized vehicle.