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Learning objectives
Grade 12 Geomorphology

Mass Movement
Slope forms: crest, free face, talus and pediment.
Mass Movement
Creep
Slump
Debris flow
Earth flow
Rockslides
Human Land use and Landslides
Preventing Landslides
Slopes

Figure 9.3
Talus Slope
Free Face
Pediment
Crest






Accumulation of active degrees
Steep slope of half to from free
Gentle slope
Convexslopewith debris5erosion face
Slope Upland
Bare rock face
Concave slope
Initial angel of 35-37 degrees
Large boulders near cliff face, pebbles rills
Rainwater channelled into Talus slope and stones further away result in a
Covered by and from the
Weatheringfinessoil creep gullies called
more gentlematerial falls is easily washedthe cliff face to retreat
Erosion, slumping and weathering cliff
Unconsolidated material over the cause away.
Weathered angle
Small particles called FINES washed out onto the pediment
Identify the following slope
and list 4 characteristics of
this slope in a textbox
below.
Talus Slope at Wheeler Peak, Great
Basin National Park, Nevada.
Accumulation of debris from free face.
Slope angle of 35-37 degrees.
Large boulders near cliff face, pebbles
and stones further away result in a
more gentle angle.
Small particles called fines are.
washed out onto the pediment.

Source: Tom Bean/DRK Photos

Copyright © Houghton Mifflin
Company. All rights reserved.

Geology, 13a–4
Identify this slope and list 4
characteristics of the slope.
Free Face :Steep slope with
active erosion.
Bare rock face.
Rainwater channelled into
gullies called rills.
Erosion, weathering and
slumping cause the cliff face
to retreat.

Fig. 11-8b, p. 253
Learning objectives
Grade 12 Geomorphology

Mass Movement
Slope forms: crest, free face, talus and pediment.
Mass Movement
Creep
Slump
Debris flow
Earth flow
Rockslides
Human Land use and Landslides
Preventing Landslides
Mass Movement
Soil Creep
Solifluction
Earth and Mud flows
Landslides and Rockfalls

Source: Roger J. Wyan/AP Wide World Photo

Copyright © Houghton Mifflin
Company. All rights reserved.

Geology, 13a–7
Mass Movement
1 Mass wasting is the downslope movement of Earth material
due to gravity. Factors such as slope angle, weathering and
climate, water content, vegetation, and overloading are
interrelated, and all affect mass wasting.
2 Mass movements can be triggered by such factors as soil
saturation and ground shaking.
3 Mass wasting can be categorized as resulting from either
rapid mass movements or slow mass movements.
4 The different types of rapid mass movements are rockfalls,
rock slides, mudflows, debris flows, and some slumps; each
type has recognizable characteristics.
5 The different types of slow mass movements are
earthflows, solifluction, soil creep, and some slumps; each
type has recognizable characteristics.
6 People can minimize the effects of mass wasting by
conducting geologic investigations of an area and stabilizing
slopes to prevent and ameliorate movement.
Table 11-2, p. 252
Important types of
mass wasting
• Slide – downslope movement of coherent block of earth
material
• Slump – is sliding along a curved slip plane producing slump
blocks
• Fall – rocks fall from vertical face
• Flow – Downslope movement of unconsolidated material in
which particles move about and mix within the mass
• Subsidence is the sinking of of a mass of earth material below
the level of surrounding material
Factors Affecting Slope Stability
•
•
•
•
•
•

Type of earth material
Slope Angle and Topography
Climate
Vegetation
Water
Time
Triggers for rapid Mass Wasting
• Rain
• Oversteepening
– cutting at foot of slope
– piling on head of slope

• Deforesting / Devegetating
• Earthquakes
Some Common Processes
that Oversteepen Slopes

Copyright © Houghton Mifflin
Company. All rights reserved.

Geology, 13a–13
Some Common Processes
that Oversteepen Slopes (cont’d)

Copyright © Houghton Mifflin
Company. All rights reserved.

Geology, 13a–14
Some Common Processes
that Oversteepen Slopes (cont'd)

Copyright © Houghton Mifflin
Company. All rights reserved.

Geology, 13a–15
Learning objectives
Grade 12 Geomorphology

Mass Movement
Slope forms: crest, free face, talus and pediment.
Mass Movement
Creep
Slump
Debris flow
Earth flow
Rockslides
Human Land use and Landslides
Preventing Landslides
Creep
• very slow downslope movement of soil
• result of freezing and thawing
Creep

from D. Schwert, NDSU
Creep
Fig. 11-5a, p. 249
Fig. 11-5c, p. 249
Fig. 11-5d, p. 249
Fig. 11-6, p. 249
Fig. 11-2, p. 247
Learning objectives
Grade 12 Geomorphology

Mass Movement
Slope forms: crest, free face, talus and pediment.
Mass Movement
Creep
Slump
Debris flow
Waters role in mass movement
Earth flow
Rockslides
Human Land use and Landslides
Preventing Landslides
Slump
A slump is a type of slope failure in which a
downward and outward rotational
movement of rock or regolith occurs along a
curved concave-up surface.
– Often the result of artificial modification of the
landscape.
– Associated with heavy rains or sudden shocks,
such as earthquakes.
Slump (a type of slide)
• Indicators:
– Scarp
– “Hummocky”
terrain on and
below (earthflow)
Slump
scarp
Learning objectives
Grade 12 Geomorphology

Mass Movement
Slope forms: crest, free face, talus and pediment.
Mass Movement
Creep
Slump
Debris / Mud flow
Earth flow
Rockslides
Human Land use and Landslides
Preventing Landslides
Debris Flow
• Debris flows are the downslope flow of relatively coarse
material
• > 50% of particles in a debris flow are coarser than sand
• Movement may be very slow or very fast, depending on
topographic conditions
• Contain less water and larger particles than Mudflows.

Turtle Mountain Rock Fall

Turtle Mountain
Water's Role In Mass Movement

Fig. 11-7a, p. 251
Water's Role In Mass Movement

Fig. 11-7b, p. 251
Water's Role In Mass
Movement:
Before Slide

Copyright © Houghton Mifflin
Company. All rights reserved.

Geology, 13a–33
Water's Role In
Mass Movement:
After Slide

Copyright © Houghton Mifflin
Company. All rights reserved.

Geology, 13a–34
Parallel Planes:
Mass-Movement Potential

Copyright © Houghton Mifflin
Company. All rights reserved.

Geology, 13a–35
Learning objectives
Grade 12 Geomorphology

Mass Movement
Slope forms: crest, free face, talus and pediment.
Mass Movement
Creep
Slump
Debris flow
Waters role in mass movement
Earth flow
Rockslides
Human Land use and Landslides
Preventing Landslides
Earthflow
Learning objectives

Mass Movement
Slope forms: crest, free face, talus and pediment.
Mass Movement
Creep
Slump
Debris flow
Waters role in mass movement
Earth flow
Rockslides
Human Land use and Landslides
Preventing Landslides
Rockslide
• Rock moves because there’s nothing holding it back!
• Generally requires a pre-existing low-friction surface...
Rockslide
• like a clay layer, once it’s wet...
Fig. 11-8a, p. 253
Fig. 11-8b, p. 253
Learning objectives

Mass Movement
Slope forms: crest, free face, talus and pediment.
Mass Movement
Creep
Slump
Debris flow
Waters role in mass movement
Earth flow
Rockslides
Human Land use and Landslides
Preventing Landslides
Human Land Use and Landslide
• Urbanization, irrigation
• Timber harvesting in weak,
relatively unstable areas
• Artificial fillings of loose
materials
• Artificial modification
of landscape
• Dam construction
Learning objectives
Grade 12 Geomorphology

Mass Movement
Slope forms: crest, free face, talus and pediment.
Mass Movement
Creep
Slump
Debris flow
Waters role in mass movement
Earth flow
Rockslides
Human Land use and Landslides
Preventing Landslides
Mitigating the Landslide Hazard (2)
• Preventing landslides
– Drainage control: Reducing infiltration and surface
runoff
– Slope grading: Reducing the overall slope
– Slope supports: Retaining walls or deep supporting
piles

• Avoid landslide hazards
– Landslide warning for critical evacuations
– Correcting landslides
Fig. 11-23a, p. 265
Fig. 11-23b, p. 265
Fig. 11-24b, p. 265
1

4

2

5

3

6
A slump is a type of slope failure in which a
downward and outward rotational movement of
rock or regolith occurs along a curved concave-up
surface.
– Often the result of artificial modification of the
landscape.
– Associated with heavy rains or sudden shocks, such as
earthquakes.

Identify this type of Mass Wasting and explain how it occurs.
What can be done to
minimize damage from
Rockfalls?
Use the photographs to
assist you in your answer.

Minimizing damage from rockfalls.
(a) Wire mesh covers this steep
slope in Hawaii. This is a common
practice in mountainous areas to
prevent rocks from falling on the
road. (b) A wire mesh fence along
the base of this hillside of Highway
44 in California has caught many
boulders and prevented them from
rolling onto the highway. But note
that some boulders have made it
over the fence.
Identify this type of mass wasting
and explain what causes it to
occur!
•

Creep is extremely slow
downward movement of
dry surfacial matter.

•

Movement of the soil
occurs in regions which
are subjected to freezethaw
conditions.
The
freeze lifts the particles of
soil and rocks and when
there is a thaw, the
particles are set back
down, but not in the same
place as before.
Identify the following types of Mass wasting
and tabulate the causes of each.

Rockslide
Occurs where nothing is holding the rocks back.
Generally requires a pre-existing low-friction
surface, like a clay layer once its wet.

Landslide
Caused by:
Erosion causing extremely steep slopes
A powerful earthquake
Excess weight on unstable soil
A Volcanic eruption.
1) Identify this type of mass wasting
2) What must you do to prevent this
type of mass wasting?

MUDFLOW
•
•

•

Plant ground cover on slopes and
build retaining walls.
In mudflow areas, build channels
or deflection walls to direct the
flow around buildings.
Install flexible pipe fittings to avoid
gas or water leaks.
1) Identify this type of mass wasting
2) Where does this type of mass
mostly occur?

Solifluction
• the slow downslope
movement of watersaturated sediment
• most common in areas
of permafrost.
Schuters pg 204 and 205

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Mass Movement

  • 1. Learning objectives Grade 12 Geomorphology Mass Movement Slope forms: crest, free face, talus and pediment. Mass Movement Creep Slump Debris flow Earth flow Rockslides Human Land use and Landslides Preventing Landslides
  • 3. Talus Slope Free Face Pediment Crest      Accumulation of active degrees Steep slope of half to from free Gentle slope Convexslopewith debris5erosion face Slope Upland Bare rock face Concave slope Initial angel of 35-37 degrees Large boulders near cliff face, pebbles rills Rainwater channelled into Talus slope and stones further away result in a Covered by and from the Weatheringfinessoil creep gullies called more gentlematerial falls is easily washedthe cliff face to retreat Erosion, slumping and weathering cliff Unconsolidated material over the cause away. Weathered angle Small particles called FINES washed out onto the pediment
  • 4. Identify the following slope and list 4 characteristics of this slope in a textbox below. Talus Slope at Wheeler Peak, Great Basin National Park, Nevada. Accumulation of debris from free face. Slope angle of 35-37 degrees. Large boulders near cliff face, pebbles and stones further away result in a more gentle angle. Small particles called fines are. washed out onto the pediment. Source: Tom Bean/DRK Photos Copyright © Houghton Mifflin Company. All rights reserved. Geology, 13a–4
  • 5. Identify this slope and list 4 characteristics of the slope. Free Face :Steep slope with active erosion. Bare rock face. Rainwater channelled into gullies called rills. Erosion, weathering and slumping cause the cliff face to retreat. Fig. 11-8b, p. 253
  • 6. Learning objectives Grade 12 Geomorphology Mass Movement Slope forms: crest, free face, talus and pediment. Mass Movement Creep Slump Debris flow Earth flow Rockslides Human Land use and Landslides Preventing Landslides
  • 7. Mass Movement Soil Creep Solifluction Earth and Mud flows Landslides and Rockfalls Source: Roger J. Wyan/AP Wide World Photo Copyright © Houghton Mifflin Company. All rights reserved. Geology, 13a–7
  • 8. Mass Movement 1 Mass wasting is the downslope movement of Earth material due to gravity. Factors such as slope angle, weathering and climate, water content, vegetation, and overloading are interrelated, and all affect mass wasting. 2 Mass movements can be triggered by such factors as soil saturation and ground shaking. 3 Mass wasting can be categorized as resulting from either rapid mass movements or slow mass movements. 4 The different types of rapid mass movements are rockfalls, rock slides, mudflows, debris flows, and some slumps; each type has recognizable characteristics. 5 The different types of slow mass movements are earthflows, solifluction, soil creep, and some slumps; each type has recognizable characteristics. 6 People can minimize the effects of mass wasting by conducting geologic investigations of an area and stabilizing slopes to prevent and ameliorate movement.
  • 10. Important types of mass wasting • Slide – downslope movement of coherent block of earth material • Slump – is sliding along a curved slip plane producing slump blocks • Fall – rocks fall from vertical face • Flow – Downslope movement of unconsolidated material in which particles move about and mix within the mass • Subsidence is the sinking of of a mass of earth material below the level of surrounding material
  • 11. Factors Affecting Slope Stability • • • • • • Type of earth material Slope Angle and Topography Climate Vegetation Water Time
  • 12. Triggers for rapid Mass Wasting • Rain • Oversteepening – cutting at foot of slope – piling on head of slope • Deforesting / Devegetating • Earthquakes
  • 13. Some Common Processes that Oversteepen Slopes Copyright © Houghton Mifflin Company. All rights reserved. Geology, 13a–13
  • 14. Some Common Processes that Oversteepen Slopes (cont’d) Copyright © Houghton Mifflin Company. All rights reserved. Geology, 13a–14
  • 15. Some Common Processes that Oversteepen Slopes (cont'd) Copyright © Houghton Mifflin Company. All rights reserved. Geology, 13a–15
  • 16. Learning objectives Grade 12 Geomorphology Mass Movement Slope forms: crest, free face, talus and pediment. Mass Movement Creep Slump Debris flow Earth flow Rockslides Human Land use and Landslides Preventing Landslides
  • 17. Creep • very slow downslope movement of soil • result of freezing and thawing
  • 19. Creep
  • 25. Learning objectives Grade 12 Geomorphology Mass Movement Slope forms: crest, free face, talus and pediment. Mass Movement Creep Slump Debris flow Waters role in mass movement Earth flow Rockslides Human Land use and Landslides Preventing Landslides
  • 26. Slump A slump is a type of slope failure in which a downward and outward rotational movement of rock or regolith occurs along a curved concave-up surface. – Often the result of artificial modification of the landscape. – Associated with heavy rains or sudden shocks, such as earthquakes.
  • 27. Slump (a type of slide) • Indicators: – Scarp – “Hummocky” terrain on and below (earthflow)
  • 29. Learning objectives Grade 12 Geomorphology Mass Movement Slope forms: crest, free face, talus and pediment. Mass Movement Creep Slump Debris / Mud flow Earth flow Rockslides Human Land use and Landslides Preventing Landslides
  • 30. Debris Flow • Debris flows are the downslope flow of relatively coarse material • > 50% of particles in a debris flow are coarser than sand • Movement may be very slow or very fast, depending on topographic conditions • Contain less water and larger particles than Mudflows. Turtle Mountain Rock Fall Turtle Mountain
  • 31. Water's Role In Mass Movement Fig. 11-7a, p. 251
  • 32. Water's Role In Mass Movement Fig. 11-7b, p. 251
  • 33. Water's Role In Mass Movement: Before Slide Copyright © Houghton Mifflin Company. All rights reserved. Geology, 13a–33
  • 34. Water's Role In Mass Movement: After Slide Copyright © Houghton Mifflin Company. All rights reserved. Geology, 13a–34
  • 35. Parallel Planes: Mass-Movement Potential Copyright © Houghton Mifflin Company. All rights reserved. Geology, 13a–35
  • 36. Learning objectives Grade 12 Geomorphology Mass Movement Slope forms: crest, free face, talus and pediment. Mass Movement Creep Slump Debris flow Waters role in mass movement Earth flow Rockslides Human Land use and Landslides Preventing Landslides
  • 38.
  • 39.
  • 40.
  • 41.
  • 42. Learning objectives Mass Movement Slope forms: crest, free face, talus and pediment. Mass Movement Creep Slump Debris flow Waters role in mass movement Earth flow Rockslides Human Land use and Landslides Preventing Landslides
  • 43. Rockslide • Rock moves because there’s nothing holding it back! • Generally requires a pre-existing low-friction surface...
  • 44. Rockslide • like a clay layer, once it’s wet...
  • 47. Learning objectives Mass Movement Slope forms: crest, free face, talus and pediment. Mass Movement Creep Slump Debris flow Waters role in mass movement Earth flow Rockslides Human Land use and Landslides Preventing Landslides
  • 48. Human Land Use and Landslide • Urbanization, irrigation • Timber harvesting in weak, relatively unstable areas • Artificial fillings of loose materials • Artificial modification of landscape • Dam construction
  • 49.
  • 50.
  • 51.
  • 52.
  • 53. Learning objectives Grade 12 Geomorphology Mass Movement Slope forms: crest, free face, talus and pediment. Mass Movement Creep Slump Debris flow Waters role in mass movement Earth flow Rockslides Human Land use and Landslides Preventing Landslides
  • 54. Mitigating the Landslide Hazard (2) • Preventing landslides – Drainage control: Reducing infiltration and surface runoff – Slope grading: Reducing the overall slope – Slope supports: Retaining walls or deep supporting piles • Avoid landslide hazards – Landslide warning for critical evacuations – Correcting landslides
  • 59. A slump is a type of slope failure in which a downward and outward rotational movement of rock or regolith occurs along a curved concave-up surface. – Often the result of artificial modification of the landscape. – Associated with heavy rains or sudden shocks, such as earthquakes. Identify this type of Mass Wasting and explain how it occurs.
  • 60. What can be done to minimize damage from Rockfalls? Use the photographs to assist you in your answer. Minimizing damage from rockfalls. (a) Wire mesh covers this steep slope in Hawaii. This is a common practice in mountainous areas to prevent rocks from falling on the road. (b) A wire mesh fence along the base of this hillside of Highway 44 in California has caught many boulders and prevented them from rolling onto the highway. But note that some boulders have made it over the fence.
  • 61. Identify this type of mass wasting and explain what causes it to occur! • Creep is extremely slow downward movement of dry surfacial matter. • Movement of the soil occurs in regions which are subjected to freezethaw conditions. The freeze lifts the particles of soil and rocks and when there is a thaw, the particles are set back down, but not in the same place as before.
  • 62. Identify the following types of Mass wasting and tabulate the causes of each. Rockslide Occurs where nothing is holding the rocks back. Generally requires a pre-existing low-friction surface, like a clay layer once its wet. Landslide Caused by: Erosion causing extremely steep slopes A powerful earthquake Excess weight on unstable soil A Volcanic eruption.
  • 63. 1) Identify this type of mass wasting 2) What must you do to prevent this type of mass wasting? MUDFLOW • • • Plant ground cover on slopes and build retaining walls. In mudflow areas, build channels or deflection walls to direct the flow around buildings. Install flexible pipe fittings to avoid gas or water leaks.
  • 64. 1) Identify this type of mass wasting 2) Where does this type of mass mostly occur? Solifluction • the slow downslope movement of watersaturated sediment • most common in areas of permafrost.
  • 65. Schuters pg 204 and 205