GG231 Chapter Notes - Chapter 5: Natural Hazard, Clearcutting, Frank Slide
Document Summary
The frank slide: turtle mountain (mountain that moves, april 29, 900m*650m*150m slab crashed into valley, formed a small lake, buried approx. 2km of canadian pacific railway and 3km of frank and grassy. Mountain railway: frank was fully evacuated, but people moved back, 1911, people were evacuated, today, has about 300 people, another large landslide could occur on the south peak of mountain, contributing factors. Cause internal/external factor that reduces stability of slope and brings it to point of failure. Trigger event that sets off landslide. Water infiltrates the mountain and over time decreases stability of the slope. Erosion eroded shales on lower slope, steepened overall slope of mountain reducing strength. Coal mining created large openings in the mountain. Heavy rain falls and increase in water exerts pressure on rocks: lessons learned. Introduction to landslides: mass wasting/landslides down slope movements of rock or sediment due to gravity, can be slow/fast and involve small/large sediment or rock, types of landslides.
