Geological Hazards Flashcards
(28 cards)
[ Fill in the blanks ]
There are ___ ______ acting on the objects that determine the ability of the slope to resist from sliding.
There are two forces acting on the objects that determine the ability of the slope to resist from sliding.
[ Identification ]
What are the two forces?
- Driving Force
- Resisting Force
[ Identification: Two Forces ]
Force of gravity acting on a material.
Driving Force
[ Identification: Two Forces ]
Force acting on a material and friction that holds it in place.
Resisting Force
[ What are these? ]
- Red areas
- Green areas
- Yellow areas
- Light pink areas
- Violet areas
Color Convention Used in the Hazard Maps
[ Identification: Color Convention ]
These areas have high susceptibility to landslides.
These are areas that have active landslides and tension cracks that would directly affect nearby communities.
Red areas
[ Identification: Color Convention ]
These areas have inactive landslides and have tension cracks located away from the community.
Green areas
[ Identification: Color Convention ]
These areas have low to gentle slopes and lack tension cracks; hence, they have low landslides susceptibility rating.
Yellow areas
[ Identification: Color Convention ]
These areas have low susceptibility to flooding.
Flood height usually below 1 meter.
Light pink areas
[ Identification: Color Convention ]
These areas have high susceptibility to flooding.
These are areas with greater than one-meter flood height and usually remain flooded for several hours during heavy rains.
Violet areas
[ Identification ]
It is the downward movement of the surface materials caused by gravity.
Mass Movement
[ Which categories do the following belong to? ]
- Rock Fall
- Flow
- Debris Avalanche
- Slides
- Slumps
- Creep
- Avalanche
Downslope Movement
[ Identification: Downslope Movement ]
Develop in zones of weaknesses or in steep mountainous regions with cliffs which are nearly vertical.
Rocks as granite, sandstone, and metamorphic rocks are most likely to cause this because they break easily into fragments.
Rock Fall
[ Identification: Downslope Movement ]
When water saturates the ground, the materials become heavier, resulting to debris flow or mudflow.
Flow
[ Identification: Downslope Movement ]
Downslope movements of rocks and soil with extremely rapid velocity.
Speed: 100-300 km/hr
Debris Avalanche
[ Identification: Downslope Movement ]
A downslope movement of a soil and rock mass occurring dominantly on defined surfaces of rupture or thin shear zone.
Slides
[ Identification ]
It is a variety of processes that result in the downward and outward movement of slope-forming materials including rock, soil, artificial fill, or combination of these.
Landslide
[ What are these? ]
- The disruption of the balance between the angle of the slope and its load.
- Buying properties located on hillsides and building houses on steep slopes.
- Water saturates slope, making them heavier and more loose.
Causes of Landslides
[ Identification: Downslope Movement ]
A translational slides moving along a surface of rupture that is curved and concave-upward.
Slumps
[ Identification: Downslope Movement ]
A relatively less dangerous mass movements involving the slow downslope movement of soil and weak rocks on the surface.
Creep
[ Identification: Downslope Movement ]
An example of very deadly downslope movement.
It is associated with snowcapped mountains.
Avalanche
[ Which categories do the following belong to? ]
- Collapse
- Ground Subsidence
Vertical Movement
[ Identification: Vertical Movement ]
When the overlying ground collapses into the soil cavities underground over the limestone, the ____ will result in sinkhole.
Collapse
[ What are these? ]
- Dissolution
- Cover Subsidence
- Cover Collapse
Common Types of Processes in Sinkhole Formation
