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NATURAL
TERRAIN IN HONG KONG
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Boulder Falls
Rock and Boulder
Falls
- Rock falls and
boulder falls are less common than landslides
- Rock falls originate
from jointed rock faces
- Occur as
falls, slides or topples of angular,
joint-bounded rock fragments
- Fragments may
accumulate to form a scree slope
- May continue
downslope by rolling, bouncing and
sliding
- Boulder falls
originate from corestones or colluvial boulders on
slopes
- Occur when
boulders are dislodged by undercutting or
landslides
- Boulder
fields most commonly occur on granites and coarse ash
tuffs
- Deposits
commonly accumulate as boulder lines in
valleys and on coast
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©
Copyright 2004 Civil Engineering and Development Department. All rights reserved.
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