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Landslide
aka "
landslip
"
ground movement
on a sloping terrain due to
gravity
it does not happen on
flat
grounds
it can be induced or aggravated by rain
Water is a
natural
agent for
erosion
Sinkholes
depression
or holes in the ground that resulted from the collapse of the surface layer of the
soil
occurs in areas where soil materials are
soft
such as limestone, salt beds, or any acidic rocks.
can be weakened further by
submersion
in water
Karst Landscape is where
sinkholes
ca be found
9
signs of an impending sinkholes:
Unusual wet areas
Soil moving away from the foundation
New cracks or
bulges
on ground or walls
Broken
underground
utility lines due to ground
tremor
Leaning
structures like buildings, walls, poles, and fences
Rapid
,
silted
creek water flow
Changes
in groundwater quality or quantity
Leaning
or
bent
signposts or poles
Newly
formed
ponds
or persistend puddles
Abney Level or Laser rangefinder
used to measure the
slope angle
,
soil compaction
, and soil strength of an area
data is used to determine the level of risk of
landslides.
Ground
-Penetrating Radar
used to validate
sinkholes
to provide images of
subsurface
ground
can detect the type of objects, changes in material, and voids and cracks under a layer of
soil
its measurement can reach up to
15
meters
widely used in mapping
sinkholes
in bohol and cebu
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