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Mass Movements aka Landslides

Mass Movements aka Landslides. Def: movement of sediment due to GRAVITY. http://www.youtube.com/watch?v=QdsxtCtX5nk&feature=player_detailpage. ROCKFALL. Rockfall- boulders. ROCKSLIDE. I-40 North Carolina Nov. 2009. http://www.youtube.com/watch?v=ZVYGJYnJTi0. AVALANCHE.

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Mass Movements aka Landslides

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  1. Mass MovementsakaLandslides Def: movement of sediment due to GRAVITY.

  2. http://www.youtube.com/watch?v=QdsxtCtX5nk&feature=player_detailpagehttp://www.youtube.com/watch?v=QdsxtCtX5nk&feature=player_detailpage

  3. ROCKFALL

  4. Rockfall- boulders

  5. ROCKSLIDE

  6. I-40 North CarolinaNov. 2009 http://www.youtube.com/watch?v=ZVYGJYnJTi0

  7. AVALANCHE • Fast movement of snow • Caused by a weak layer of snow underneath surface • Usually in Spring • http://www.youtube.com/watch?v=B0RWLxOFGLY Avalanche Danger In Colorado At 30 Year High, Says Expert; 6 Fatalities So Far This Season

  8. Snowbird, UT Nov. 2011 Jamie Pierre, here performing an extreme jump, was killed while snowboarding near Gad Valley on Sunday.

  9. Telluride

  10. http://www.nwac.us/media/uploads/documents/accidents/US_avalanche_fatalities_by_user_group_by_year_1997-2XXX.pdfhttp://www.nwac.us/media/uploads/documents/accidents/US_avalanche_fatalities_by_user_group_by_year_1997-2XXX.pdf

  11. Mudflow/Lahar • Mudflow- clay mixed with water • Usually in spring- snowmelt • Lahar- volcanic ash mixed with water

  12. MudflowJava 2007

  13. http://www.youtube.com/watch?v=VMJiibdVYjE&feature=player_popouthttp://www.youtube.com/watch?v=VMJiibdVYjE&feature=player_popout http://www.youtube.com/watch_popup?v=VMJiibdVYjE&vq=small#t=34

  14. Lahar MT ST HELENS

  15. SLUMP Saturation of water + loss of friction causes soil below surface layer to drop downhill. Surface stays intact

  16. CREEP • SLOW movement of soil • Causes tilting of objects • Usually soil • Result of freeze/thaw

  17. CREEP

  18. Creep

  19. SOLIFLUCTION • IN ARTIC CLIMATES • In spring when top layer melts, moves slowly over permafrost

  20. Are mass movements weathering or erosion?

  21. Factors influencing Mass Movement • 1. Amount of moisture • More adds weight and makes slippery • 2. angle of slope • 3. lack of vegetation • Roots hold back movement • 4. rock type • Sedimentary worst • 5. Roundness of particle • Rounder move faster

  22. Mass movements • Cost US $4 billion per year • http://landslides.usgs.gov/recent/index.php?year=2009&month=Oct

  23. Landslide Causes? http://www.youtube.com/watch?v=JrV4uCVwmfk

  24. Laguna Beach 2005

  25. Philippines Feb. 20061800 dead

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