US 550 Bondad Hill 2142016 http www nytimes

US 550, Bondad Hill 2/14/2016

http: //www. nytimes. com/interactive/2014/03/23/us/washington-mudslide. html http: //www. nytimes. com/2014/03/24/us/washington-mudslide. html? _r=0# https: //www 2. usgs. gov/blogs/features/usgs_top_story/landslide-in-washington-state/ http: //abcnews. go. com/US/wire. Story/proposed-settlement-reached-washingtonlandslide-suit-42693264 https: //www. youtube. com/watch? v=ch. Wk 1 v 50 Kf. Q

Consider how steep a slope can be and remain stable Sand dune Angle of repose for dry sand 15. 07. b Some parts of slope steeper than angle of repose Scoria cone Talus slope Coarse material can have a steeper angle of repose

Factors that control slope stability Amount of water Angle of repose for material Discontinuities: fractures, cleavage and bedding 15. 07. c

Some ways that slopes fail Earthquake activity 15. 08. a 1 Undercut cliff Too steep a slope Undercut slope

Classification of Slope Failures Mechanism of Movement Fall Flow Solid rock Unconsolidated Fast Slow Type of Material Rate of Movement 15. 08. b 1 15. 08. b

Observe what happens when rocks fall or slide Rock fall and debris fall Rock slide Rotational slide 15. 09. a 1

Observe the types of slope failure that involve flow: Part 1 Creep Debris slide Earth flow 15. 10. a

Observe the types of slope failure that involve flow: Part 2 Debris flow Rock or debris avalanche 15. 10. a

Slide Lake, Utah: What kind of movement is this? Moved 14 ft between 2004 and 2009

Egypt New Zealand Japan

Landslides and La Conchita 1995 15. 10. m 2005

Slope Failures in the U. S. Earth flow - New York Debris avalanche - Alaska Rock slide - Wyoming Landslide - Utah 15. 11. a