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Questions and Answers
Which geological phenomenon involves a large mass of rocks, earth, and other materials moving down an elevation?
Which geological phenomenon involves a large mass of rocks, earth, and other materials moving down an elevation?
- Landslide (correct)
- Volcanic eruption
- Tectonic shift
- Glacial retreat
What characterizes 'creep' as a type of landslide?
What characterizes 'creep' as a type of landslide?
- Sudden and rapid rockfall from cliffs
- Slow downslope movement of particles on weathered slopes (correct)
- Coherent mass of consolidated materials moving rapidly
- Flow of water and fine-grained materials down a ravine
Which type of mass wasting involves a coherent mass of loosely consolidated materials moving a short distance down a slope?
Which type of mass wasting involves a coherent mass of loosely consolidated materials moving a short distance down a slope?
- Slump (correct)
- Creep
- Rock fall
- Debris flow
What is the primary characteristic of a 'rock fall'?
What is the primary characteristic of a 'rock fall'?
How does a 'rockslide' differ from a 'rock fall'?
How does a 'rockslide' differ from a 'rock fall'?
What characterizes a 'sturzstrom' type of landslide?
What characterizes a 'sturzstrom' type of landslide?
Which of the following components are typically found in a 'debris flow'?
Which of the following components are typically found in a 'debris flow'?
Where does a mudflow typically occur?
Where does a mudflow typically occur?
Under what conditions does a landslide most likely occur, according to the text?
Under what conditions does a landslide most likely occur, according to the text?
How do human activities contribute to increasing the likelihood of landslides?
How do human activities contribute to increasing the likelihood of landslides?
What does an earlier landslide event indicate about the hazard potential of a location?
What does an earlier landslide event indicate about the hazard potential of a location?
What does a sudden change in water flow, such as the arrival of water in a usually dry spring, indicate?
What does a sudden change in water flow, such as the arrival of water in a usually dry spring, indicate?
What are tension cracks and where are they typically observed?
What are tension cracks and where are they typically observed?
What does ground movement look like?
What does ground movement look like?
What condition is more likely to lead to landslides?
What condition is more likely to lead to landslides?
Flashcards
What is a landslide?
What is a landslide?
A geological phenomenon where a large mass of rocks, earth, and other materials move down the side of an elevation like a mountain or hill.
What is Creep (in landslides)?
What is Creep (in landslides)?
Slow downslope movement of particles on slopes covered with loose, weathered material.
What is Slump (in landslides)?
What is Slump (in landslides)?
Mass wasting where a coherent mass of loosely consolidated rock layers moves a short distance down a slope.
What is a Rock Fall?
What is a Rock Fall?
Falling of a newly detached mass of rock from a cliff or down a very steep slope.
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What is a Rockslide?
What is a Rockslide?
Rock failure where the bedding plane of failure passes through intact rock, collapsing the material in masses.
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What is a Sturzstrom?
What is a Sturzstrom?
A unique landslide consisting of soil and rock with great horizontal movement relative to its vertical drop.
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What is a Debris Flow?
What is a Debris Flow?
A moving mass of loose mud, sand, soil, rock, water, and air traveling downslope due to gravity.
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What is Mudflow?
What is Mudflow?
A mass of water and fine-grained earth materials flowing within a stream, ravine, or canyon.
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When does a landslide happen?
When does a landslide happen?
Occurs when driving forces exceed resisting forces, often on steep slopes with weakened rocks or human disturbances.
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What is an indicator of an earlier landslide event?
What is an indicator of an earlier landslide event?
The site has a history of landslides in the same or nearby areas with similar slope configurations.
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What is a change of water flow?
What is a change of water flow?
Sudden appearance of water in a spring or seep in an area that is usually dry.
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What are Tension Cracks?
What are Tension Cracks?
Manifestations seen as cracks in roads, pathways, or building walls near unstable areas.
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What is considered Ground Movement?
What is considered Ground Movement?
Noticeable or very slow earth movement, such as creep measured in centimeters.
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- A landslide is a geological phenomenon where a large mass of rocks, earth, and other materials move down the side of an elevation like a mountain or hill.
Types of Landslides
- Creep is the slow downslope movement of particles on slopes covered with loose, weathered material.
- Slump is a form of mass wasting where a coherent mass of loosely consolidated rock layers moves a short distance down a slope.
- Rock fall happens when a newly detached mass of rock falls from a cliff or a very steep slope.
- Rockslide is caused by rock failure in which part of the bedding plane of failure passes through intact rock, collapsing the material in masses rather than individual blocks.
- Sturzstrom is a unique type of landslide consisting of soil and rock with significant horizontal movement compared to its initial vertical drop.
- Debris flow involves a moving mass of loose mud, sand, soil, rock, water, and air traveling down a slope due to gravity.
- Mudflow is a mass of water and fine-grained earth materials flowing down streams, ravines, and canyons.
Landslides and Force
- Landslides or landslips occur when the driving force exceeds the resisting force.
- Landslides often happen if slopes are steeper or composed of weakened, loose rocks, due to rock degradation, or because of human activities along the slopes.
Signs of Impending Landslides
- Areas with a history of landslides in the same location, nearby slopes, or similar slope configurations are at risk.
- A sudden presence of water in a spring, seep, or wet ground that is usually dry can indicate that something has changed.
- Tension cracks in man-made structures like roads, pathways, and building walls near slopes can be a sign.
- Ground movement can be immediately noticeable or a slow, subtle creep of a few centimeters.
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