Mass Movement Types Flashcards
1
Q
Which movement occurs at barely perceptible rates - mm per year ?
A
Soil creep
2
Q
Which movement occurs quickly up to metres per second when 1000s of tonnes of rock fall ?
A
Land slides
Mudflows
3
Q
2 factors to why mass movement occurs?
A
Gravity
Presence of water
4
Q
How does water promote mass movements ?
A
Saturated rocks.
Reduced friction.
This increases mass of material.
5
Q
When are sub aerial movements most likely to occur ?
A
If marine eruption has removed material from base if cliff.
Slope becomes unstable and slips.
6
Q
What is the risk equation ?
A
Frequency/ magnitude of hazard X level of vulnerability DIVIDED by capacity of population to cope
7
Q
Low risk
A
Vary rare.
Not dangerous.
Unpopulated
