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(a)
(b)
Plate 13.21 (a) Active debris flow and fan sites in the San Gabriel mountains above Los Angeles, southern California and (b)
debris flow slugs, displaying meandering flow on the Marine Drive, Llandudno, North Wales, after intense rain in June 1993.
Photos: Ken Addison
toe bulge
Sand run
Earth flow
Rotational slide, slump
Lateral spreading slide
Rockwall
Scree
Bulging in
incompetent
strata
Block slide
Cambering
Debris avalanche
Rock and debris creep
Figure 13.19 Failure modes in unconsolidated earth materials .
Source: Partly after Varnes (1958)
 
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