Disaster Readiness and Risk Reduction Chapter 6 (other related geological hazards) 1. Landslide 2. Sinkhole

1. CHAPTER 6
Other Related
Geological

3. Rainfall-Induced
Landslide
A landslide is a
massive outward and
downward movement
of slope-forming
materials.
Landslide as a

4. Rainfall-Induced
Landslide
 Causes of Landslide
Groundwater pressure acting to
destabilize the slope
Erosion of the toe of a slope by rivers or
ocean waves
Weakening of a slope through saturation

5. Sinkhole
sSinkholes are common where the
rock below the land surface is
limestone, carbonated rock, salt
beds, or rocks that can naturally be
dissolved by groundwater circulating
through them.
Sinkholes are dramatic because the
land usually stays intact for a while

6. Sinkholes can be human-induced
1. New sinkholes have been
to land-use practices, especially
from groundwater pumping and
from construction and development
practices.
2. Sinkholes can also form when
Sinkhole
s

7. Signs of
Impending
Geological
Hazards

8. Landslide
Earlier Landslide as an indicator
Observing old landslides is a good
indication that the area has unstable
geology, and that more landslides are likely to
happen in the future
Tension Cracks
Tension cracks are created by the stress of

9. Landslide
Things Moving
Observable movement and deformation of
things are also indicators of an impending
landslide. The most common among these is
that trees are bending up in a J-curve as a
sign that the ground slips out from under
them
Water Doing Something Different

10. Sinkholes
Trees or fence posts that
tilt or fall
New small ponds that
appear after rain
Sudden drainage of a pond

11. Assessment:
1. Explain the meaning of disaster.
2. Differentiate the risk factors underlying
disaster
3. Describe the effects of disaster on human’s life
4. Explain how and when an event becomes a
disaster

12. OUTPUT:
A. Based on your understanding, identify some
areas in the Philippines that are exposed to
hazard. Using a table, indicate what potential
hazards these areas/locations are exposed to.
B. Read an account of Super Typhoon Yolanda
that struck Samar and Leyte in 2013. Analyse
its impacts from the different perspectives:
Physical, Psychological, Socio-cultural,

13. END of
chapter 6