drrr Flashcards
are gradual or sudden natural earth processes that cause injury, loss of life, property damage, loss of livelihood and services, social and economic disruption, or environmental changes.
Geological Hazards
is rock, dirt, or debris falling down a sloping section of land. ___ are caused by storms, earthquakes, volcanoes, or other factors which make the slope unstable.
Landslide
Geology, Morphology, Human activity
three major causes of landslides
this refers to the material of the soil or rock in the area or can be the layers of earth has weakened or stiffened in some part.
Geology
this refers to the structure of the land. The soil or rock has weakened through loss of vegetation or root system which holds the soil in place. Another is prolonged rainfall or heavy water leakage that increases the weight of the land mass therefore as the water flows, sediments and soils also come with it.
Morphology
to make way for agriculture and construction, trees need to be cut down. Irrigation, deforestation, and excavation can weaken the integrity of the earth.
Human activity
This occurs due to prolonged or heavy rainfall, increasing the weight of the land mass. Rainfall-induced landslides can form debris flows when they mix
Rainfall-induced Landslide
Unusual noises, such as breaking trees, or knocking boulders together, can mean moving debris.
As the landslide nears, a slight rumbling sound that rises in amplitude is noticeable.
Rapid rise in water levels of the creeks, likely followed by increased turbidity (soil content).
impending signs of a rainfall-induced landslide
are caused by drilling, mining, road construction, and broken water or underground pipes. Water may penetrate through mud and rocks and eventually erode the ground underneath.
Man-made sinkholes
are caused by physical or chemical erosion. The natural flow of water may erode rock material while acidic substances may also dissolve and eventually weaken it.
Natural sinkholes
is a depression or hole caused by the collapse of the surface layer of the ground. Water is the primary cause of most sinkholes when it dissolves soluble rocks such as limestone, dolomite, and gypsum.
Sinkhole
- Solution sinkholes 2. Cover Subsidence Sinkholes 3. Cover Collapse Sinkholes
Types of sinkholes
are common in areas that have thin cover of soil on the surface of the ground which exposes the bedrock to water erosion.
Solution sinkholes
this occur when the bedrock is covered by soil and materials that are not well-knitted together.
Cover Subsidence Sinkholes
occur when the bedrock is covered by a deep layer of soil and earth.
Cover Collapse Sinkholes
- New cracks at the foundations of buildings and houses
- Cracks in an area
- Depressions at ground level
- Rapid appearance of a crater in the ground
The impending signs of a sinkhole
Unregulated industrialization and inadequate safety standards increase the risk for industrial disasters.
Technological/industrial disasters
the threat of terrorism has also increased due to the spread of technologies involving nuclear, biological, and chemical agents used to develop weapons of mass destruction.
Terrorism/Violence
has various connotations within different disciplines. In general, risk is defined as “the combination of the probability of an event and its negative consequences” (UNISDR, 2009).
Risk
the term complex emergency is usually used to describe the humanitarian emergency resulting from an international or civil war
Complex humanitarian emergencies