landslides Flashcards
1
Q
colluvium
A
deposit of mass wastage
2
Q
serpentine
A
SW oregon area ( green rock)
3
Q
falls
A
rapid sescent of material vertically
- mostly rock fall
- talus at bottome fo slope=rock fall
4
Q
topple
A
large slabs fall over, common in columbia river basalt
5
Q
slump
A
failure plane on rotation
6
Q
translational slide
A
whole mass moves parallel to slope; usually on failure plane.
1. block slide - where moves as a block.
7
Q
quick blays;
A
rapid liquefaction of soils from a vibration; Rissa slide in Norway
8
Q
flows:
A
liquid limit of debris approached
- mudflows and debris flows
a. mainly in streams
b. only about 30% water
c. especially in Arid and Alpine rigin
d. mudflows: sand, silt and clay >80%
e. debris flow …cobbels… < 80%
f. travel long distances, faster than floods in velocity
9
Q
Earthfloow:
A
slow movement; lower water content; on sides of slopes, large tongue shaped deposits
10
Q
debris avalanches
A
Rapid descent of debris by all and sliding
Large, fas moving over 300km/hr, long distance
11
Q
creep
A
slow, imperceptible movement of soil.
rates; .1mm/yr - 10 cm/yr
