8.1 mass movements

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Chapter 8.1 Chapter 8.1 Mass Movements at Mass Movements at Earth’s Surface Earth’s Surface Pages 181-190 Pages 181-190

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Page 1: 8.1 Mass Movements

Chapter 8.1 Chapter 8.1 Mass Movements at Mass Movements at

Earth’s SurfaceEarth’s Surface

Pages 181-190Pages 181-190

Page 2: 8.1 Mass Movements

Goal 1Goal 1

Identify the 5 factors that affect Identify the 5 factors that affect mass movementsmass movements

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Mass movementsMass movements

– the down-slope movement of loose the down-slope movement of loose sediments and weathered rock resulting sediments and weathered rock resulting from the pull of gravityfrom the pull of gravity

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1.1. Slope angleSlope angle

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2.2. Material weightMaterial weight

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3.3. Material resistance to movementMaterial resistance to movement

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4.4. TriggerTrigger

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5.5. WaterWater

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Goal 2Goal 2

Recognize and describe types of Recognize and describe types of mass movementsmass movements

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CreepCreep

– Slow, few cm/yearSlow, few cm/year– All slopesAll slopes

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– Tilted objectsTilted objects

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– Broken Broken constructionconstruction

– Overtake Overtake roads, roads, sidewalkssidewalks

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FlowsFlows– Thick liquidThick liquid– Vibration triggerVibration trigger– Rain trigger in arid areaRain trigger in arid area– MixingMixing

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– Earth flow = slowEarth flow = slow

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– Mud flow =FastMud flow =Fast

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SlidesSlides– RapidRapid– Block of materialBlock of material– Little mixingLittle mixing– Trigger = Trigger =

earthquakeearthquake

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– RockslideRockslide

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– RockslideRockslide

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– LandslideLandslide

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Check out this link to see a video of a Check out this link to see a video of a landslide in Japanlandslide in Japan

http://nwgeoscience.com/kelso/http://nwgeoscience.com/kelso/

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SlumpSlump Type of landslideType of landslide Materials “rotate”Materials “rotate” Curved slideCurved slide

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AvalancheAvalanche– SnowSnow– Slope 35°Slope 35°– Melt – refreezeMelt – refreeze– More snowMore snow– Vibration triggerVibration trigger

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Rock FallsRock Falls– High elevationsHigh elevations– Road cutsRoad cuts– Rocky shorelinesRocky shorelines– Weathered RockWeathered Rock– FallsFalls

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Picture CreditsPicture Credits http://web.umr.edu/~rogersda/landslide_hazards/http://web.umr.edu/~rogersda/landslide_hazards/ http://www.mrd.gov.fj/gfiji/img/infonote/creep.gifhttp://www.mrd.gov.fj/gfiji/img/infonote/creep.gif http://epod.usra.edu/archive/images/soilcreepaspens1sm.jpghttp://epod.usra.edu/archive/images/soilcreepaspens1sm.jpg http://www.mtsu.edu/~cdharris/GEOL100/erosion/btown-wall.jpghttp://www.mtsu.edu/~cdharris/GEOL100/erosion/btown-wall.jpg http://pubs.usgs.gov/fs/2004/3072/fs-2004-3072.htmlhttp://pubs.usgs.gov/fs/2004/3072/fs-2004-3072.html http://www.kgs.ku.edu/Extension/image/landslide1.htmlhttp://www.kgs.ku.edu/Extension/image/landslide1.html http://landslides.usgs.gov/recent/socal_reconn/images/photo5.jpghttp://landslides.usgs.gov/recent/socal_reconn/images/photo5.jpg http://www.metrokc.gov/prepare/preparerespond/hazardsdisasters/landslides.aspxhttp://www.metrokc.gov/prepare/preparerespond/hazardsdisasters/landslides.aspx http://en.wikipedia.org/wiki/Image:Landslide.jpghttp://en.wikipedia.org/wiki/Image:Landslide.jpg http://www.yosemite.org/newsroom/clips2006/september/Rockslide.jpghttp://www.yosemite.org/newsroom/clips2006/september/Rockslide.jpg http://seis.natsci.csulb.edu/bperry/Mass%20Wasting/ShearStressSteepSlopeDiagramB.jpghttp://seis.natsci.csulb.edu/bperry/Mass%20Wasting/ShearStressSteepSlopeDiagramB.jpg http://landslides.usgs.gov/learning/images/misc/slumpNoDak.jpghttp://landslides.usgs.gov/learning/images/misc/slumpNoDak.jpg http://www.uwsp.edu/geo/faculty/ritter/images/lithosphere/mass_wasting_erosion/slump_USGS_DDShttp://www.uwsp.edu/geo/faculty/ritter/images/lithosphere/mass_wasting_erosion/slump_USGS_DDS

21.jpg21.jpg http://epod.usra.edu/archive/images/bitterwater_slump_s.jpghttp://epod.usra.edu/archive/images/bitterwater_slump_s.jpg http://www.avalanche.org/~lsafc/JPGFILES/NOMEN2.GIFhttp://www.avalanche.org/~lsafc/JPGFILES/NOMEN2.GIF http://www-evasion.imag.fr/Membres/Fabrice.Neyret/NaturalScenes/avalanches/catalog.htmlhttp://www-evasion.imag.fr/Membres/Fabrice.Neyret/NaturalScenes/avalanches/catalog.html http://www.boingboing.net/images/http://www.boingboing.net/images/

_us.yimg.com_p_ap_20050110_capt.cadd10101102308.topix_california_storm_cadd101.jpg_us.yimg.com_p_ap_20050110_capt.cadd10101102308.topix_california_storm_cadd101.jpg http://www.physci.mc.maricopa.edu/Geology/FieldTrips/ColoradoRiver/2004Summer/http://www.physci.mc.maricopa.edu/Geology/FieldTrips/ColoradoRiver/2004Summer/

ColoradoRiver_2004Summer_Images_640/CR_Leighty_052904_3681_Mile0072_PcPtPk_RockFall.JPGColoradoRiver_2004Summer_Images_640/CR_Leighty_052904_3681_Mile0072_PcPtPk_RockFall.JPG Also Wikipedia commons carried some Public Domain ImagesAlso Wikipedia commons carried some Public Domain Images