Podcast
Questions and Answers
How does a reduction in precipitation affect soil stability?
How does a reduction in precipitation affect soil stability?
- Increases the water table and soil mass.
- Causes ground saturation immediately.
- Lowers the water table and reduces soil mass. (correct)
- Enhances freeze-thaw activity.
Seismic activity does not contribute to landslides because the soil moves uniformly with the tectonic plates.
Seismic activity does not contribute to landslides because the soil moves uniformly with the tectonic plates.
False (B)
What role do plants and bacteria play in the weathering process that leads to landslides?
What role do plants and bacteria play in the weathering process that leads to landslides?
Chemical action
Erosion by running water, wind, and waves removes slope support, enabling landslides to occur more ______.
Erosion by running water, wind, and waves removes slope support, enabling landslides to occur more ______.
Match the type of precipitation with its potential impact on landslide occurrence:
Match the type of precipitation with its potential impact on landslide occurrence:
How does a volcanic eruption in wet conditions contribute to landslides?
How does a volcanic eruption in wet conditions contribute to landslides?
Forest fires reduce the risk of landslides by increasing the protective ability of vegetation.
Forest fires reduce the risk of landslides by increasing the protective ability of vegetation.
What role does gravity play in triggering landslides on steeper slopes?
What role does gravity play in triggering landslides on steeper slopes?
Mining activities that use blasting techniques can weaken soils due to the ______ from the blasts.
Mining activities that use blasting techniques can weaken soils due to the ______ from the blasts.
Match the human activity with its potential to cause landslides:
Match the human activity with its potential to cause landslides:
What immediate effect does clear-cutting have on the stability of an area?
What immediate effect does clear-cutting have on the stability of an area?
Rainfall is the only factor that determines the occurrence of landslides.
Rainfall is the only factor that determines the occurrence of landslides.
What features of precipitation have a great effect on the stability of slopes and the rate of occurrence of landslides?
What features of precipitation have a great effect on the stability of slopes and the rate of occurrence of landslides?
Sinkholes occur when ______ rocks are dissolved by water or air, creating voids in the ground.
Sinkholes occur when ______ rocks are dissolved by water or air, creating voids in the ground.
Match the cause of a sinkhole with its description:
Match the cause of a sinkhole with its description:
What visual form can sinkholes take on the ground's surface?
What visual form can sinkholes take on the ground's surface?
Sinkholes are only caused by human activities and not by natural processes.
Sinkholes are only caused by human activities and not by natural processes.
What results when a void under ground is filled with underground water?
What results when a void under ground is filled with underground water?
Altering drainage systems cause water to branch into other routes where there is soluble rock, which causes ______ through the flow of water.
Altering drainage systems cause water to branch into other routes where there is soluble rock, which causes ______ through the flow of water.
How does mining that uses blasting techniques contribute to landslides?
How does mining that uses blasting techniques contribute to landslides?
Flashcards
Climate and Landslides
Climate and Landslides
Long-term climatic changes impacting soil stability; precipitation changes affect water table and soil mass.
Earthquakes and Landslides
Earthquakes and Landslides
Seismic activity causes soil movement and landslides, especially in steep slope areas due to ashen debris flows.
Weathering
Weathering
The natural process of rock deterioration leading to weak, landslide-susceptible materials; chemical action weakens rocks.
Erosion's Effect
Erosion's Effect
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Volcanic Eruptions
Volcanic Eruptions
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Forest Fires
Forest Fires
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Gravity & Slope
Gravity & Slope
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Mining and Slope
Mining and Slope
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Clear Cutting
Clear Cutting
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Rainfall-Induced Landslides
Rainfall-Induced Landslides
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Natural Sinkhole Formation
Natural Sinkhole Formation
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Sinkhole from pumping
Sinkhole from pumping
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Study Notes
- Geological hazards include landslides and sinkholes
Landslides
- Long-term climate changes greatly affect soil stability
- A decline in precipitation reduces the water table and weight of soil mass
- Precipitation upsurge and ground saturation increases ground water levels
- Landslides can occur on sloped areas fully saturated without root support
- Seismic activity has long contributed to landslides
- Tectonic plate movement causes soil movement
- Earthquakes on steep slopes can cause soil slippage and landslides
- Ashen debris flows from earthquakes also cause soil movement
- Weathering is the natural breakdown of rocks, creating landslide-prone materials
- The chemical actions of water, air, plants, and bacteria cause weathering
- Weakened rocks can slip, leading to landslides
- Erosion from water, wind, currents, ice, and waves removes slope support
- Slope support removal makes landslides more likely
- Volcanic eruptions in wet conditions makes soil move downhill
- Stratovolcanoes commonly cause landslides worldwide
- Volcanic gases dissolve in groundwater and create acidic hydrothermal systems
- Altering minerals to clay weakens rock
- Forest fires burn soil-holding vegetation, increasing landslide risk for up to 20 years in dry climates
- Wildfires remove protective vegetation, increasing runoff and debris flow
- Burrowing insects aerate and destabilize soil during wildfires, seeking cooler soil
- Steeper slopes and gravity trigger massive landslides and move debris farther
Human Causes of Landslides
- Mining that uses blasting can cause landslides
- Blasting vibrations weaken soils in landslide-prone areas
- Earthwork changes slopes, adding loads to existing slopes
- Clear cutting timber eliminates old trees
- Clear cutting decimates mechanical root structure and changes soil water infiltration
- Rainfall-induced landslides happen due to heavy rainfall
- Rainfall-induced landslides are common and damaging in the Philippines, with 20 typhoons each year
- Rainfall-induced landslides tend to be shallow, thin and move quickly
Factors of Landslides
- Soil conditions are very critical for landslides
- Precipitation features, rainfall volume, length, severity, and terrain slope affect slope stability and landslide rates
- Precipitation-induced landslides depend on land cover and soil type
Sinkholes
- Sinkholes form when sedimentary rocks dissolve
- Rocks can dissolve and form a void of water or air
- Air-filled voids become holes, and water-filled voids form lakes or ponds
- Sinkholes appear as holes or depressions
Human Causes of Sinkholes
- Pumping water underground changes drainage, eroding soil
- Broken pipes underground cause internal erosion and create voids
- Altered drainage cause water to flow into soluble rock areas and cause erosion
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