Mass Wasting Earth Science Tarbuck and Lutgens Chapter 4 Pages 102 112 KOIN stories about Stevenson WA and Rock Creek mass wasting 2 15 http www koin com global video popup pop player asp ClipID1 1241389 h1 Creek 20Waters 20Rise 2C 20Bridge 20Could 20Crumble vt1 v at1 News d1 183533 LaunchPageAdTag News activePane info pla yerVersion 1 hostPageUrl http 3A www koin com Global SearchResults asp 3Fqu 3DStevenson rnd 8743 878 2 14 http www koin com global video popup pop player asp ClipID1 1238645 h1 Hillside 20Crashing 20Into 20 Creek vt1 v at1 News d1 207934 LaunchPageAdTag News activePane info playerVersion 1 hostPageU rl http 3A www koin com Global SearchResults asp 3Fqu 3DStevenson rnd 64522157 2 8 http www koin com global video popup pop player asp ClipID1 1225552 h1 Geologist 20Says 20Landslide 20Is 20Imminent vt1 v at1 News d1 179467 LaunchPageAdTag News activePane info playerVersion 1 hostPageUrl http 3A www koin com Global SearchResults asp 3Fqu 3DStevenson rnd 54765151 Mass Wasting Important triggering factors Saturation Oversteepening Removal of vegetation Ground vibrations Mass Wasting The downslope movement of rock regolith and soil under the direct influence of gravity Gravity is the controlling force Important triggering factors Saturation of the material with water Destroys particle cohesion Water adds weight Important triggering factors Important triggering factors Oversteepened slopes Oversteepened slopes Unconsolidated granular particles assume a stable slope called the angle of repose Stable slope angle is different for various materials Oversteepened slopes are unstable Undercutting by streams Undercutting by human interference Addition of material to top of slope Natural deposition Human caused construction 1 Important triggering factors Mass Wasting Types of mass wasting processes Removal of anchoring vegetation Wildfires Drought Development logging Defined by The material involved The movement of the material Ground vibrations from earthquakes Types of mass wasting processes Defined by the material involved Debris Mud Earth Rock Types of mass wasting processes Defined by the movement of the material The rate of the movement Fast Slow Types of mass wasting processes Defined by the movement of the material The character of the movement Fall Slide Flow Forms of mass wasting Slump Rockslide Debris flow Earth flow Creep Solifluction 2 USGS Landslide Types Types of mass wasting http pubs usgs gov fs 2004 3072 fs 2004 3072 html Forms of mass wasting Slump diagram Slump Rapid movement along a curved surface Occur along oversteepened slopes Slump Government Hill AK 1964 http walrus wr usgs gov geotech radaraapg fig4 html http www physicalgeography net fundamentals 10x html 3 Government Hill AK seismic cross section Forms of mass wasting Rockslide Rapid Blocks of bedrock move down a slope Cousin to Rockfall http walrus wr usgs gov geotech radaraapg fig5 html Rockslide diagram Elkton Oregon March 4 2006 http www kmtr com mediacenter default aspx videoId 4191 video kmtr com 4199 video kmtr com 4200 video kmtr com 4195 video kmtr com 4189 video kmtr com navCatId 5 2 2 Elkton Oregon March 4 2006 http www kmtr com news local story aspx content id 010798AE AF2F 41D5 93F5 120A64493D45 Nevado Huascar n Peru 1970 Buried two towns 18 000 killed Geologists warned government of potential http www kmtr com news local story aspx content id 010798AE AF2F 41D5 93F5 120A64493D45 http landslides usgs gov html files landslides slides slide5 htm 4 Gros Ventre rockslide diagram Slide Lake Wyoming http www goldengatephoto com WestUS wyother html grosventre Gros Ventre landslide photo Sherman Glacier Rock Avalanche March 1964 http www uwsp edu geo projects geoweb participants dutch VTrips GrosVentre HTM Rock Fall Rock Fall July 1996 Yosemite http landslides usgs gov html files landslides slides slide9 htm http sts gsc nrcan gc ca geoscape vancouver graphics mountain1 gif 5 Forms of mass wasting Debris flow mudflow Rapid flow of debris with water Confined to channels Dry areas with heavy rains Lahar composed of volcanic materials Snohomish County WA January 2006 US 50 Sierra Nevadas California 1997 http www komotv com stories 41527 htm http landslides usgs gov monitoring hwy50 index php La Conchita California La Conchita California Spring 1995 No one injured or killed February 2005 http landslides usgs gov html files landslides slides slide21 htm 6 La Conchita 2005 Slide Mountain Nevada 1983 http landslides usgs gov html files landslides slides slide2 htm http www redcross org article 0 1072 0 312 3943 00 html Debris flow damage Lahar debris flow Nevado del Ruiz Toutle River Debris Flow http pubs usgs gov fs fs 176 97 fs 176 97 html http landslides usgs gov html files landslides slides slide13 htm http volcanoes usgs gov Hazards What Lahars RuizLahars html 7 Eruption of Nevado del Ruiz Confluence of lahars Nevado del Ruiz http volcanoes usgs gov Hazards What Lahars RuizLahars html Armero site Nevado del Ruiz http volcanoes usgs gov Hazards What Lahars RuizLahars html Scar of Philippine landslide http volcanoes usgs gov Hazards What Lahars RuizLahars html Philippine Landslide 2006 http www alertnet org thenews pictures MAN52D htm Forms of mass wasting Earthflow Rapid or slow Typically occur on hillsides in humid regions Water saturates the soil Liquefaction associated with earthquakes and clay soils http news yahoo com news tmpl story u 060219 481 xbm10202190643 8 Earthflow diagram Hollywood Hills CA January 2005 http www cnn com interactive weather 0501 gallery storms frameset exclude html Niigata Japan 1964 Anchorage AK 1964 http www owlnet rice edu sehh AlaskaEQ Alaska Sci EQScience http www ce washington edu liquefaction selectpiclique nigata64 tiltedbuilding jpg 1964 liquefaction damage Alaska 1964 http www ce washington edu liquefaction selectpiclique alaska64 landslideintowater jpg http walrus wr usgs gov geotech radaraapg fig5 html Hyperlink to sand boil liquefaction http walrus wr usgs gov geotech images TIsandboils mov 9 Sheffield Dam 1925 Santa Barbara County Forms of mass wasting Creep Earth quake caused flow Slow movement of soil and regolith downhill Causes fences and utility poles to tilt http www ce washington edu liquefaction selectpiclique dams sheffielddam1 jpg Cause of creep frost heave Creep Bedrock curled due to creep mass wasting Some visible effects of creep Creep Curved trunks due to soil creep http classes colgate edu dkeller geol101 massw images creep1 jpg http www
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