Landslides and Mass Wasting
Landslides and Mass Wasting GEOL 1005
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This 1 page Class Notes was uploaded by Frances Cooke on Sunday November 15, 2015. The Class Notes belongs to GEOL 1005 at George Washington University taught by Glenn Havelock in Fall 2015. Since its upload, it has received 17 views. For similar materials see Environmental Geology in Geology at George Washington University.
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Date Created: 11/15/15
Landslides and Mass Wasting Most due to gravity Mass wasting downslope movement of rock and soil due to gravity Triggers O O O 0 Water reduces internal resistance of materials and adds weight to slope I Sedimentary rocks very porous I Added water fills the pores and causes instability I Decreases rocksoil cohesion Oversteepening of slopes I Angle of repose angle where unconsolidated material sand gravel is stable 0 Varies for different materials 0 Coarse material produces a more stable slope angular pebbles or coarse material rather than fine sand Removal of vegetation I Root systems bind soil and regolith top layer of material above bedrock I Roots soak up water I Removal due to agriculture deforestation forest fire Earthquakes Types of mass wasting O O O O O Landslidesslumps I Slump blocks push earth slide fonNard Rockslides and rockfalls I Bedding planes in same direction as the slope very dangerous bc moves as a sheet I Frank slide Alberta Canada limestone slide killed 80 people I Rock fall mainly at the coast from cliffs Debris flowsmudflows Earth flows slow moving debris flow Creep How a landslide forms 0 O 0 Add or subtract mass in the wrong place Driving mass larger than resisting mass Rotational landslide slump La Conchita CA 1995 O 0000 Mudflow after heavy rainfall No fatalities Buried homes Occurred again in 2004 in exactly the same spot USGS community is not safe from landslides