GG231 Lecture 6: GG231 Chapter 6
Document Summary
Cause: internal or external factor that over time,reduces stability of slope and brings it to point of failure. Trigger: e vents that sets off the landslide ( the final straw ) Landslide and mass wasting: describe downslope movement of rock or sediment due to gravity: can be low or fast and involve small/large volumes of sediment/rock, also include slow moving rocks or soil. Many landslides are complex combos of sliding and flow. Ratio of resisting forces to the driving forces. Resisting forces exceed driving, slope considered stable. Driving exceed resisting forces, slope failure expected. Zones along which rock or soil has moved before. Hazardous if inclined more than 15 degrees 2. Slope stability strongly influenced by slope steepness and topographic relief. 6. 2 geographic regions at risk from landslides: landslides occur where there are significant slopes, mountainous areas have higher risk for landslides than areas of low relief, areas where landslides are common: british columbia, yukon,
