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

Goal 1Goal 1

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

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

1.1. Slope angleSlope angle

2.2. Material weightMaterial weight

3.3. Material resistance to movementMaterial resistance to movement

4.4. TriggerTrigger

5.5. WaterWater

Goal 2Goal 2

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

CreepCreep

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

– Tilted objectsTilted objects

– Broken Broken constructionconstruction

– Overtake Overtake roads, roads, sidewalkssidewalks

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

– Earth flow = slowEarth flow = slow

– Mud flow =FastMud flow =Fast

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

earthquakeearthquake

– RockslideRockslide

– RockslideRockslide

– LandslideLandslide

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/

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

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

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

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