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Landslides
Landslides are a geological event where large portions of ground break loose and slide down a slope. they can cause large amounts of damage, and are generally quite dangerous.
366 Questions
Is landslide a man-made disaster?
Landslides can be triggered by both natural factors such as heavy rainfall or earthquakes, as well as human activities like deforestation, construction on steep slopes, and mining. Therefore, landslides can be a result of man-made actions that disrupt the natural stability of the land.
Why is a landslide so destructive?
a landslide is so destructive because they cause damage. they will slip of the walls of canyons and crush peoples houses. they also cause death. landslides are like tornadoes. They can be caused by earthquakes and is bigger than all natural disasters all together!Its true...!
What to do in case of a landslide?
If you are in a landslide-prone area, it's important to be prepared. Stay tuned to weather alerts and evacuate if advised. Move to higher ground if you are able to do so safely, and avoid rivers and low-lying areas. After the landslide, check for gas leaks, water line damage, and unstable ground.
How are a landslide and a avalance different?
A landslide involves the movement of large volumes of unstable earth down an incline (e.g. a hill or mountainside). It can be caused by a number of phenomena, including seismic activity (i.e. earthquakes), erosion, prolonged drought, rainfall (typically resulting in a specific subset of landslide called the mudslide), poor soil management, or other factors.
By contrast, an avalanche is the movement of large volumes of snow. It can be caused by vibrations from seismic activity or, in extreme situations, loud sounds as well as by any disruption to the snow (e.g. removing a portion of the snow with a snow plow).
What Can you do to prevent landslides?
Landslides cannot be prevented 100% of the time. However, their scope and severity can be reduced by not building human structures at the base of steep hills andmaintaining native ground cover (plants such as grasses) on hills.
What were the environmental impacts of Thredbo landslide?
The main cause of the 1997 Thredbo landslide was the collapse of the Alpine Way above the town. It was the result of a combination of factors, including wet weather and the way the road had been constructed.
The Alpine Way, which runs above the village of Thredbo and through the Snowy Mountains, was originally built as a service road during the construction of the Murray 1 and 2 hydroelectric power stations in the 1950s. After the hydroelectric stations were finished, the road was upgraded, which included the addition of landfill.
Around 11:30pm on the night of 30 July 1997, the road collapsed from the pressure of heavy rain, melting snow and the waterlogged landfill, all of which resulted in 2000 square metres of liquefied soil rushing down the mountainside. The Carinya Lodge was pushed down onto the Bimbadeen Lodge, killing 18 staff.
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Is it possible to stop a landslide?
Yes, in a way you can. People who work in mountain landslide areas start a landslide on purpose so that they can control when one will start. People who work in rock slide areas also do things like putting up netting on the side of a hill to stop a future slide and plant plants to hold the dirt down.
Further detail:Soil Slopes
There are a number of potential solutions which are used to try and prevent a landslide occurring in soil slopes which commonly involve either increasing the strength of the soil mass or reducing the stress acting upon it.
Soil nailing is a process whereby steel bars are grouted into holes drilled into the unstable soil slope face. These are placed in a regular array and act to reinforce the soil by increasing it's tensile and shear strength.
Mini piling is similar in concept to soil nailing however the piles are commonly of higher strength and larger dimensions than a soil nail and so would be used in situations where a greater restraining force is required to support the soil mass but also require more extensive and expensive works to place.
Other solutions include lime stabilisation which involves boring columnar holes into the soil and mixing a lime or other grouting material into the fill material which acts to increase the soil strength, inhibiting the formation of shear planes and halting soil movement.
Another solution may be de-watering which is a process where the groundwater table is lowered. This acts to reduce the pore water pressure in the soil mass in turn increasing the in-situ stress and hence the shear strength of the soil which can halt movement.
Another potential solution is the planting of vegetation on the soil slope whereby the roots will act to bind the soil mass increasing it's strength and acting to inhibit the formation of shear surfaces which are necessary for slope failures / movements to occur in soils. Vegetation will also act to reduce the infiltration rate of water into the soil which can reduce the fluctuations in pore water pressure which will also act to increase the stability of the soil slope.
Rock Slopes
Areas that may be prone to rock falls or rock slides are commonly assessed by an engineering geologist. They will attempt to identify regions where the rock mass forming the slope or cliff face is at risk of failure.
These regions are likely to be those where there is weak material (for example a band of shale in other higher strength sedimentary rocks) or areas where the structure of the rock mass makes a failure more likely to occur. An example might be where the bedding planes or joints within the rock mass dip steeply towards the slope face.
When they identify areas where failure is a potential risk, they will then suggest a solution depending on the exact nature of the potential problem. Solutions may include rock bolts which are used where discrete blocks in a rock mass might fall from the face of a cliff and the bolt or anchor essentially acts to secure the block to the stable rock mass behind. Rock anchors perform a similar role to rock bolts but are used where greater restraining forces are required.
Other solutions include the scaling of the face. This involves removing loose material and small loose blocks that have the potential to fall. The engineer may also recommend that retaining structures be built in front of certain portions of the weak rock mass to act to support weakened material. Rock catch netting may also be attached to the face of a potentially unstable slope to catch small blocks which may fall from the face. Larger collapse may be halted by rock catch fences which are high strength steel posts secured firmly into the ground and which are connected by rows of high tensile strength steel cable. These are placed at the base of slopes or cliffs to halt any larger blocks which may fall from the cliff face.
Another solution which is commonly used before the application of rock bolts is "shotcreteing". This is when a reinforcing steel mesh is bolted to the rock face and then high viscosity concrete is sprayed onto the face. This sets and acts to support the rock face. An extreme solution may be to actually trim the rock face back to an angle that is stable however this is commonly not possible due to both practical and economic considerations.
Can an earthquake cause a landslide?
No. Landslides and earthquakes are two different things. A land slide is when a large mass of land gives away and slides down, and an earthquake is caused when a fault occurs, a break in the rock. Or stress built up at plate tectonics (it depends of the type of faults what occured). They are two completely unrelated things and will not affect each other.
Landslide election winner in 1945?
The landslide election winner in 1945 was Clement Attlee of the Labour Party in the United Kingdom. Attlee's party defeated Winston Churchill's Conservatives by a large margin, leading to Labour's victory and a change in leadership.
What landslide or mudslides are most dangerous?
Landslides or mudslides triggered by heavy rainfall, earthquakes, or volcanic eruptions in steep and mountainous areas can be particularly dangerous. These events can happen suddenly, move quickly, and cause significant destruction to communities, infrastructure, and the environment. Areas prone to frequent rainfall, deforestation, and poor land-use planning are at higher risk for devastating landslides and mudslides.
How are mudflows and landslides different?
A landslide is of big chunks of rock that slide down the hill and a mud flow is of clay that turn into a muddy mess.
So:
LANDSLIDE :is of big chunks of rock that slide down the hill
MUD FLOW :is of clay that turn into a muddy mess.
What process is involved in landslides?
Earthquakes are caused by the build up or accumulation of pressure (more correctly termed stress). This accumulation of stress causes the rocks that make up the crust to deform elastically
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Volcanic eruptions can produce loose ash deposits, heavy rain, and debris flows. The eruption of Mount St. Helens on May 18, 1980 triggered massive landslides, including the largest landslide in the world, which moved 2.8 cubic kilometers of earth material.
Definition of an election landslide?
Compare and contrast landslides and mudflows?
Landslides are when land breaks off of a mountain or hill and crumbles as it slides down destroying everything in its path. Mudflows are very similar to landslides but contain 60% of water.
What is the main cause of a landslide?
The main cause of a landslide is typically excessive rainfall or snowmelt that saturates the ground, leading to instability and movement of the earth. Other factors such as deforestation, urbanization, and construction on steep slopes can also contribute to triggering landslides.
What was the biggest landslide in a presidential election?
The greatest modern landslides in the United States Presidential elections * 1920 - the greatest percentage point margin in the popular vote (Harding 60.3% to Cox 34.1%). * 1936 - the greatest electoral votes difference between winner and opponent (Roosevelt 523 to Landon 8). * 1964 - the highest percentage for winner (Lyndon Johnson 61.1%). * 1984 - the highest number of electoral votes (Reagan 525). * 1789 and 1792 - the highest percentage of Electoral College Votes (100% - George Washington was the only president to win a unanimous Electoral College victory. Washington received the maximum possible electoral votes in both the 1789 and 1792 election.)[2] Nixon (1972) and Reagan (1984) both won 49/50 states. For more information, see http://www.realclearpolitics.com/epolls/maps/obama_vs_mccain/?map=16
How many people servied the abbotsford landslide?
If by "servied" you mean "survived", everyone. Some 640 people were affected by the slip, either through being made homeless or through having to be evacuated, but thankfully no-one died.
What happens during a landslide?
A landslide is caused when there is a prolonged spell of heavy rain of high intensity. The rain runs off the hillside and takes soil and vegetation with it. The hillside weakens over time and larger amounts of soil/stones and vegetation goes with it. The heavy rain penetrates /attacks the Hillside weakening it until it gives away. Landslides have impermeable rock underneath which makes the soil permeable. Gravity moves the land downhill, with rocks, pebbles and soil moving down in blocks. The aftermath of a landslide requires machinery as houses and roads can be buried underneath the rubble. It needs to clear the soil/mud and also stabilize the hill so no more collapses. A landslide can also be a result of finite stress on the slope of a hill which as a result of rain and other phenomena and sometimes the lack of tress and shubery (as these do stall the slipage) cause the land to give way.
Essentially, a landslide results from the failure of soil and rock on hillsides to remain securely in place, as for one reason or another, they lose cohesion. Another major force is gravity. Gravity causes stress for slope materials such as rocks and soil, because it is constantly acting to try to pull the materials downslope.
Any of the following factors can contribute to landslides:
- Tree clearing and deforestation: with fewer trees and tree roots to secure the soil, landslides can more easily occur.
- Earthquakes: earth tremors can destabilise hillsides.
- Excessive rainfall: super-saturated soils can not hold up against gravity.
- Use of landfill to build up hillsides and roadways: landfill is not a stable as solid ground or rock.
- Mining activities, quarrying and excavation: blasting causes vibrations which can have the same effect as eartquakes and tremors, while undermining a slope causes instability.
- Drought: drier soil is less cohesive than damp soil.
Why are the Siwalik are prone to landslide?
It is because of the following reasons :
(i) Shivalik range is made up of unconsolidated sediments, which are not compact and consolidated.
(ii) These sendiments, are more susceptible for downslope movement under the force of gravity in rainy season.
Why is shiwalik prone to landslides?
The Shiwalik region is prone to landslides due to its hilly terrain, clay-rich soil, and heavy monsoon rainfall. The steep slopes and weak geological structure of the area contribute to frequent landslides, making it a high-risk zone for such natural disasters.
A landslide is a natural disaster that occurs when a mass of earth or rock moves downhill rapidly, typically due to heavy rainfall, earthquakes, or other factors. This movement can cause significant damage to property and pose a threat to human life.
