1. By : Alyanna Sharyce D. Aparilla
Mass Wasting
By : Alyanna Sharyce D. Aparilla
geo1.tcu.edu

2. Mass Wasting mass movement or slope movement large movement
rock, soil and debris
force of gravity
changes mountain
suddenly or slowly over time
landslide
geo1.tcu.edu

3. Role of mass wasting maintains the slopes shapes the landscape
geo1.tcu.edu

4. Slopes change through time
Modification of slope either by humans or by natural causes can result in changing the slope angle so that it is no longer at the angle of repose. A mass-wasting event can then restore the slope to its angle of repose.
geo1.tcu.edu

5. Role of water Dry Slightly wet Saturated with water increase according
form a pile with a
to grain size but
slope angle of
usually 30 and 37
repose
Slightly wet
high
hold in place
Saturated with water
low
flow like liquid
geo1.tcu.edu

6. - unconsolidated grains
Over steepened slopes
Slope steepness
Gravitational force
Increased steepness
more mass wasting
Angle of repose
- steepest angle
- unconsolidated grains
- stable
- frictional contact
geo1.tcu.edu

7. Removal of vegetation Earthquakes Prone to mass wasting
vegetation stablelizes soil particles on the surface
anchors soil under the surface
Blog.savemaumee.org
Earthquakes
Violent shaking
sections of mountain or
hills
slide down
slope
cbsnews.com

8. Mass Wasting Type of Motion Rate of Movement OR Rapid Slow Fall
Creep
Slump
Rockslides & Slumps
Solifluction
Rockslide
Permafrost
Debris flow
Flow
Earth flow
geo1.tcu.edu

9. Fall rock or debris steep slope dislodged falls down the slope
single or mass
collision
nature.nps.gov

10. Rock fall in Mayon volcano
142 volcanic earthquakes
251 rockfall events in the past 24 hours
Updated September 19, :00am
philstar.com

11. bedding plane, joint or area of weakness
Rockslide
Travel a long way
source initial fall
rapid
down slope movements
bedding plane, joint or area of weakness
break up
Large pieces collide

12. Rockslide on Marcos highway

13. Slump slides downward rotation rock or regolith curved surface.
upper surface undisturbed,
arcuate scars or depressions .
Heavy rains or earthquakes
alevelgeography.com

14. Liquefaction
Liquefaction is a phenomenon in which the strength and stiffness of a soil is reduced by earthquake shaking or other rapid loading. 

15. Fast flowing river concrete
Debris Flow
debris
rain water
slope material
freshly burned land
Chapparral land
rapid
Fast flowing river concrete
most dangerous
car sized boulders
Sentinel Asia and CNES

16. Mudflows Lahar thaw caused by volcanic eruption mud ash hot water
highly fluid
high velocity
sediment and water
consistency of wet concrete
heavy rains
unconsolidated sediment
volcanoes.usgs.gov

17. Lahar after Mt. Pinatubo eruption
Lourdes
15 miles northeast of Mount Pinatubo
lahars
June 1991
100,000 + people destroyed

18. Earth flow heavy rains Velocities: 110s of m/day
active for long periods of time
narrow tongue-like features
scarp or small cliff

19. Debris Flow Sentinel Asia and CNES
Barangays Andap and Cabinuangan in New Bataan, Compostela Valley.
Boulder-rich debris flow field (red)
sandy deposits (tan).
7 kilometers long.
Sentinel Asia and CNES

20. Soil creep slow Soil and rocks Gravity farther down the slope
freeze or thaw
Bulges in the soil

21. melted water, regolith and upper layer of soil
Solifluction
cold polar regions
high mountains
melted water, regolith and upper layer of soil
slips over the ground
ngee-arctic.blogspot.com

22. Permafrost layer of groundwater fills spaces soil and rock
permanently frozen

23. REF: ( (

24. Mass Wasting Type of Motion Rate of Movement OR Rapid Slow Fall
Creep
Slump
Rockslides & Slumps
Solifluction
Rockslide
Permafrost
Debris flow
Flow
Earth flow
geo1.tcu.edu