Mass wasting Flashcards
Downslope movement of the rock and regolith near the earth’s surface
Mass Wasting process
True or False. Integral part of the erosional process, as it move material from higher elevations to lower elevations.
True
Any perceptible downslope movement of the rock or regolith is often referred to in general terms as a __________.
Landslide
When Cherry Hills landslide happened?
August 1-3, 1999
What type of mass movement happened in Cherry Hills Landslide?
Complex landslide. Started out as a slump and developed into a debris flow near the base.
What type of mass movement happened in the Guinsaugon, Leyte?
Complex landslide (rock and debris avalanches)
When Guinsaugon landslide happened?
February 17, 2006
What type of mass movement happened in Andap, New Bataan?
Debris flow
When Andap Debris flow happened?
December 04, 2012
What is the maximum runup height of Andap Debris Flow?
1.8 meters
The material that is (practically) still in place and adjacent to the highest parts of the main scarp.
Crown
A steep surface on the undisturbed ground at the upper edge of the landslide is caused by the movement of the displaced material away from the undisturbed ground. It is the visible part of the surface of the rupture.
Main scarp
The highest point of contact between the displaced material and the main scarp.
Top
The upper parts of the landslide along the contact between the displaced material and the main scarp.
Head
A steep surface on the displaced material of the landslide is produced by differential movements within the displaced material.
Minor scarp
The part of the displaced material of the landslide that overlies the surface of rupture between the main scarp and the toe of the surface of rupture.
Main body
The portion of the landslide that has moved beyond the toe of the surface of rupture and overlies the original ground surface.
Foot
The point of the toe farthest from the top of the landslide.
Tip
The lower, usually curved margin of the displaced material of a landslide, it is the most distant from the main scarp.
Toe
The surface that forms (or has formed) the lower boundary of the displaced material below the original ground surface.
Surface of rupture
The intersection (usually buried) between the lower part of the surface of rupture of a landslide and the original ground surface.
Toe of surface of rupture
The part of the original ground surface overlain by the foot of the landslide.
Surface of separation
Material displaced from its original position on the slope by movement in the landslide. It forms both the depleted mass and the accumulation.
Displaced material
The area of the landslide within which the displaced material lies below the original ground surface.
Zone of depletion
The area of the landslide within which the displaced material lies above the original ground surface.
Zone of accumulation
The volume bounded by the main scarp, the depleted mass and the original ground surface.
Depletion
The volume of the displaced material that overlies the rupture surface but underlies the original ground surface.
Depleted mass
The volume of displaced material that lies above the original ground surface.
Accumulation
The undisplaced material is adjacent to the sides of the rupture surface. Compass directions are preferable in describing the flanks but if left and right are used, they refer to the flanks as viewed from the crown.
Flank
The surface of the slope that existed before the landslide took place.
Original ground surface
Currently moving
Active
Moved within the last 12 months but not active at present.
Suspended
Inactive landslide that has been activated again.
Reactivated