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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
What caused the landslides in Tibet in 1950 that destroyed 70 villages?
The landslides in Tibet in 1950 were likely triggered by heavy rainfall and the region's steep terrain. The combination of water-saturated soil and steep slopes can lead to slope failures and landslides. Deforestation and land use practices may have also played a role in destabilizing the slopes.
What mass movements are dependent on the addition of water?
Mass movements like landslides, mudslides, and debris flows are often triggered by the addition of water, which increases the weight and lubricates the slope materials, reducing their stability and causing them to move downslope. Similarly, coastal erosion and beach erosion can also be influenced by the presence of water, which weakens the coastal landmass and contributes to its movement.
What is the speed of landslides and mudflows?
The speed of landslides and mudflows can vary greatly depending on factors such as slope steepness, volume of material, and moisture content. They can range from a few centimeters per hour to over 160 km/h in extreme cases.
Landslides and soil creeps are examples of what?
Landslides and soil creeps are examples of mass wasting, which is the downhill movement of rock and soil under the force of gravity. They occur when the strength of the material is exceeded by the force of gravity acting upon it, leading to downslope movement.
Landslides can be dangerous because they can happen suddenly and without warning, causing great damage to property and infrastructure as well as posing a risk to human lives. Landslides can happen in areas with steep slopes, heavy rainfall, or seismic activity, making them a natural hazard that can have devastating consequences.
How do landslides caused by cutting trees affect the ecosystem?
Landslides caused by cutting trees affect the ecosystem by destroying habitat where many animals and even people live. The landslides actually change the contours of the land sometimes rerouting rivers.
How do you prepare before a mudslide?
To prepare for a mudslide, keep emergency supplies on hand, such as food, water, flashlights, and first aid kits. Make sure your home is well-insulated and waterproofed, and consider installing barriers to divert mud away from your property. Stay informed about local weather conditions and evacuation routes.
What do glaciers and landslides tend to create?
fjords are often formed like the coastline of Scandinavia after the last ice age. It can also make the earth on which it resides go flat, much like the Alberta and Saskatchewan in Canada, also the prairies of the USA. It all depends on the composition of the earth underneath the glacier. I hope this info is helpful and or 100% correct, for it has been some years since I last did research on this topic.
Does mercury have any landslides?
Mercury does not have any landslides in the traditional sense as it lacks significant geological activity due to its small size and proximity to the Sun. However, surface features called "lobate scarps" are thought to be the result of compressional forces causing the planet's crust to shrink and wrinkle, which could be considered a type of tectonic activity.
What are the 2 states in India where landslides are common?
areas affected by lanslide are kashmir, himachal pradesh, punjab, marasashtra, arunachal pradesh,narkanda The Indian states most affected by landslides are Arunachal Pradesh, Manipur, Meghalaya, Nagaland and Sikkim.
What was the largest landslide in recorded history?
The largest landslide on record occurred on May 18, 1980 when the north face of Mount St Helens collapsed during an earthquake. It had an estimated volume of 3 cubic kilometers. The landslide relieved pressure on magma inside the volcano, triggering a massive eruption.
Jefferson defeated him in a landslide victory in the presidential election of 1804?
Democratic-Republican Thomas Jefferson overwhelmingly defeated Federalist Charles Pinckney in the Presidential election of 1804. Jefferson carried 15 states with 162 electoral votes compared Pinckney's 2 states and 14 electoral votes. The only states that Jefferson lost in were Delaware and Connecticut.
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.
