Podcast
Questions and Answers
Which of the following scenarios best illustrates a landslide occurring due to the driving force exceeding the resisting force?
Which of the following scenarios best illustrates a landslide occurring due to the driving force exceeding the resisting force?
- Heavy rainfall saturates a deforested hillside, causing it to collapse. (correct)
- An earthquake causes minor cracks in a building foundation.
- A construction company builds a retaining wall to stabilize a steep slope.
- A hillside remains stable despite heavy rainfall due to dense vegetation.
Which human activity is LEAST likely to directly contribute to an increased risk of landslides?
Which human activity is LEAST likely to directly contribute to an increased risk of landslides?
- Implementing strict building codes that require proper soil compaction and drainage systems. (correct)
- Deforestation on steep slopes for agricultural purposes.
- Construction of roads and buildings without adequate slope stabilization measures.
- Uncontrolled mining operations that destabilize hillsides.
A geological survey identifies an area with a history of ground spreading. Which type of landslide would you expect to be most likely in this area?
A geological survey identifies an area with a history of ground spreading. Which type of landslide would you expect to be most likely in this area?
- Fall
- Spread (correct)
- Topple
- Slide
Following a significant landslide event, what action would be the LEAST appropriate immediately after the event?
Following a significant landslide event, what action would be the LEAST appropriate immediately after the event?
Which of the following pre-landslide actions would provide the MOST direct benefit to community safety?
Which of the following pre-landslide actions would provide the MOST direct benefit to community safety?
During a landslide, why is running across the slope generally recommended over running downward?
During a landslide, why is running across the slope generally recommended over running downward?
Which set of observations would MOST strongly indicate that an area is prone to landslides?
Which set of observations would MOST strongly indicate that an area is prone to landslides?
Which engineering measure provides the MOST direct method of preventing landslides on a steep slope?
Which engineering measure provides the MOST direct method of preventing landslides on a steep slope?
What is the primary difference between a 'fall' and a 'topple' type of landslide?
What is the primary difference between a 'fall' and a 'topple' type of landslide?
Why is it important to consult a geotechnical expert after a landslide, even if your property appears undamaged?
Why is it important to consult a geotechnical expert after a landslide, even if your property appears undamaged?
Which of the following is NOT a typical effect of landslides on the environment and infrastructure?
Which of the following is NOT a typical effect of landslides on the environment and infrastructure?
How do volcanic eruptions contribute to the risk of landslides?
How do volcanic eruptions contribute to the risk of landslides?
Which of the following strategies for reducing landslide risks primarily involves educating the public?
Which of the following strategies for reducing landslide risks primarily involves educating the public?
Clearance secured from the Mines and Geosciences Bureau (MGB) helps to ensure what aspect of landslide preparedness?
Clearance secured from the Mines and Geosciences Bureau (MGB) helps to ensure what aspect of landslide preparedness?
How does heavy rainfall increase the likelihood of landslides?
How does heavy rainfall increase the likelihood of landslides?
What is the primary role of hazard mapping in reducing landslide risks?
What is the primary role of hazard mapping in reducing landslide risks?
Which of the following is the MOST immediate action to take upon receiving a landslide warning?
Which of the following is the MOST immediate action to take upon receiving a landslide warning?
In the context of landslides, what does the term 'driving force' refer to?
In the context of landslides, what does the term 'driving force' refer to?
Which type of landslide is MOST likely to occur after a major earthquake in a mountainous region?
Which type of landslide is MOST likely to occur after a major earthquake in a mountainous region?
What is the key difference between a slide and a flow landslide?
What is the key difference between a slide and a flow landslide?
After a landslide, why should you inspect your house for damage before re-entering?
After a landslide, why should you inspect your house for damage before re-entering?
What is the purpose of early warning systems in landslide risk reduction?
What is the purpose of early warning systems in landslide risk reduction?
How do leaning trees, fences, or utility poles indicate a potential landslide hazard?
How do leaning trees, fences, or utility poles indicate a potential landslide hazard?
What type of landslide is likely to happen in soft clay soil?
What type of landslide is likely to happen in soft clay soil?
Which activity would be LEAST effective in reducing landslide risk?
Which activity would be LEAST effective in reducing landslide risk?
What defines the 'resisting force' in the context of landslide mechanics?
What defines the 'resisting force' in the context of landslide mechanics?
Which measure would a community take to BEST prepare for potential landslides?
Which measure would a community take to BEST prepare for potential landslides?
What is the MOST critical action to take if you are inside a building during a landslide?
What is the MOST critical action to take if you are inside a building during a landslide?
Which of the following is NOT a key recommendation for what to do after a Landslide?
Which of the following is NOT a key recommendation for what to do after a Landslide?
What is one of the first sign to look when identifying landslide-prone areas?
What is one of the first sign to look when identifying landslide-prone areas?
What is the main cause of landslides?
What is the main cause of landslides?
What is NOT considered a human activity which increases the risk of landslides?
What is NOT considered a human activity which increases the risk of landslides?
What material is prone to 'spread' landslides?
What material is prone to 'spread' landslides?
What should one do BEFORE a landslide?
What should one do BEFORE a landslide?
What is the Mines and Geosciences Bureau's (MGB) role when building in landslide-prone areas?
What is the Mines and Geosciences Bureau's (MGB) role when building in landslide-prone areas?
What is an appropriate thing to do AFTER a landslide?
What is an appropriate thing to do AFTER a landslide?
How to reduce the risk of landslides?
How to reduce the risk of landslides?
How to determine if a landslide might occur soon?
How to determine if a landslide might occur soon?
When an earthquake hits, which landslide is more likely?
When an earthquake hits, which landslide is more likely?
Flashcards
What is a landslide?
What is a landslide?
The downward movement of rock, soil, or debris due to gravity when the driving force exceeds the resisting force.
Heavy Rainfall
Heavy Rainfall
Water weakens soil, leading to instability and increased landslide risk.
Earthquakes
Earthquakes
Shaking ground causes slopes to collapse, triggering landslides.
Volcanic Eruptions
Volcanic Eruptions
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Human Activities
Human Activities
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Steep Slopes & Weak Soil
Steep Slopes & Weak Soil
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Fall (Landslide Type)
Fall (Landslide Type)
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Topple (Landslide Type)
Topple (Landslide Type)
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Slide (Landslide Type)
Slide (Landslide Type)
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Spread (Landslide Type)
Spread (Landslide Type)
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Flow (Landslide Type)
Flow (Landslide Type)
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Identifying Landslide-Prone Areas
Identifying Landslide-Prone Areas
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Before a Landslide
Before a Landslide
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During a Landslide
During a Landslide
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After a Landslide
After a Landslide
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Reducing Landslide Risks
Reducing Landslide Risks
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Study Notes
What is a Landslide?
- Landslides involve the downward movement of rock, soil, or debris due to gravity.
- They occur when the driving force exceeds the resisting force.
Causes of Landslides
- Heavy rainfall weakens the soil, causing instability.
- Earthquakes cause slopes to collapse via shaking.
- Volcanic eruptions weaken land stability due to ash and lava.
- Human activities, including deforestation, mining, and construction, disturb the land.
- Steep slopes and weak soil increase landslide potential.
Types of Landslides (Varnes' System)
- Fall: Rocks break off and fall freely.
- Topple: Rocks tilt and fall forward.
- Slide: A large mass of rock or soil moves downward.
- Spread: Ground extends sideways, typically in soft clay.
- Flow: Mud, debris, or earth moves like a fluid.
Effects of Landslides
- Landslides cause property damage.
- Landslides can cause injury or loss of life.
- Landslides disrupt transportation and utilities.
- Landslides result in the loss of farmland and natural resources.
How to Identify Landslide-Prone Areas
- Look for a history of past landslides in the area.
- Assess the presence of steep slopes or cliffs nearby.
- Check for cracks in the ground or buildings.
- Identify leaning trees, fences, or utility poles.
- Notice signs of unusual water movement.
What to Do Before a Landslide
- Secure clearance from the Mines and Geosciences Bureau (MGB).
- Prepare an evacuation plan.
- Keep emergency contact numbers handy.
- Participate in tree-planting and awareness programs.
What to Do During a Landslide
- Evacuate immediately if warned.
- Avoid the landslide path.
- If inside, evacuate as soon as possible.
- Run across the slope, not downward.
What to Do After a Landslide
- Check for injuries and assist others.
- Stay away from the landslide area.
- Inspect your house for damage before re-entering.
- Stay informed by listening to news updates.
- Seek advice from a geotechnical expert.
How to Reduce Landslide Risks
- Implement hazard mapping.
- Create public awareness programs.
- Utilize engineering measures like retaining walls, drainage, and slope protection.
- Establish early warning systems.
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