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By: My Tran and Jessica Truong. Science project on mudslides linking to tectonic plates

Christine Tran

on 21 November 2013

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Transcript of Mudslide/landslide

By: My Tran and Jessica Truong

Identify and describe the involvement of Plate Tectonics in Mudflows
Good impact on the environment
- When landslide occurs on a vast, deserted land, the excess soil will help fertilize and neutralize the soil on the land.
The impact of landslide & mudslide on Humans
- When a landslide occurs, its descent, huge quantities of soil, mud, rocks and smaller debris hurtle down a hillside, mountain or volcano.

The impact of landslide & mudslide near villages
Whole villages will be buried under layers of soil. -People’s inhabitants and livestock will be swept along on tides of mud and debris. -Houses will be flattened or swamped with the excess soil. -Communications will be cut off/hygienic problem. -People will be buried alive. -There will be many casualties such as injuries or even death. -Destruction of the whole villages. -Air pollution can cause sickness
(Part One- Jessica)
Media article about Landslide
The impact of landslide & mudslide on the environment
Detrimental impacts on the environment: -Trees will be uprooted. -Landslides cause by volcanic eruption or earthquake followed by torrential rains will erode water-saturated soil, exposing layers of rock beneath. This will annihilate the landform and soil. -Living organisms will die and natural resources will lose its minerals. -Excess soil can travel to a nearby river and will pollute the water. -Pollution/more land waste.
Please the link to look at the Media Article

- Two disastrous landslides struck at Papua New Guinea.
- Killed 9 people and blocked the most important highway.
- The landslides buried around six homes and nine people at Kenagi village in the Eastern Highlands province.
- The first landslide happened late on Saturday night, the second came on Sunday morning.
- These landslides were known to be caused by heavy rain.
- It slide from the top of the mountain, passed the main road and down into the river.
- The landslide covered about 30 metres of the road and about two metres high.
- One deceased body had been discovered but eight bodies were left unfound.

How could Land flows be prevented in the future or how its impact can be minimized?
We can minimized mudflows by:
- Growing deep rooting vegetation on slopes, to hold the soil in place.
- Avoid constructing buildings or any other type of land modification.
- Avoid getting the area having bushfire, as it contributes to mudslide by leaving a lot of loose debris on the forest floor.

Safety for people in the future
- warning systems (AFMs)
- plan evacuations
- Try not to live near areas that hilly or mountainous.

Minimize home hazards.
- Plant ground cover on slopes and build retaining walls.
- In mudflow areas, build channels or deflection walls to direct the flow around buildings.

Pictures of Landslide
Cowaramup Bay, WA 1996
reproduced with permission from EMA
Landslide, Dungog NSW
reproduced with permission from RCA Australia
Landslide, Philippines
Landslides Image
reproduced with permission
from British Columbia Geological Survey
Mudflows are a common hazard associated with stratovolcanoes and can happen without an eruption.

- Stratovolcano: noun- a large, steep volcano built up of alternating layers of lava and ash or cinders.

Strato= (Latin root) Alternating Layers

Mudslide occurs when heavy rainfall or melted snow saturates the surface of the slope and with the help of gravity, it pulls all the loose soil, debris and ashes down on the side of the stratovolcano.

Semeru stratovolcano, Java, Indonesia.
Mudslide linking to Earthquake and Volcano
- Most landslides are caused by natural forces or events, such as excessive rain and snow melt.

- Shaking due to earthquakes, volcanic eruptions and gravity.

When a hill is damaged and shaken by an earthquake, the soil on the side of the hill can fall down, with heavy rain picking up all the loose soil and debris and forms the natural disaster- Mudflows.


Bibliography :)


Mudflow and Landslide
Micheal Woods and Mary B. Woods, 2007, Lerner Publications Company,, USA page 14 and 50.

Avalanches and Landslides
J Walker, 2002, Aladdin Books Ltd, Franklin Watts, Great Britain, page 20 and 21.


Volcanoes and mountains can all be formed by converging boundaries.

Converging Plates: When two crust glides together.
Ocean to continent collision
How volcanoes and mountains are form?
When oceanic crust collides with continental crust, the oceanic landforms is pushed downwards into the mantle because it is denser.
- Mountains are formed by the crumble edges and Volcanoes are forms as heat rises through the cracks .

So how does it link to tectonic plates?
uprooted trees
Avalanches and Landslide Page 18- 19
Mount St Helens Volcano
On 18 May 1980, erupted violently following an earthquake beneath the volcano; the shockwaves from the earthquake on the northern side of the volcano.
All the fallen rocks combine with excessive waste and rocks also formed mudflow called Lahar

Lahar: noun, a landslide of wet volcanic debris on the side of a volcano.
No one was hurt, but in November 1985 a ferocious eruption left 25,000 casualties.
Mudflows cover an area of more than 40 square kilometres, it also destroy the farm land of rice and coffee growing area.

The impact of landslide & mudslide on the environment
Landslides are also associated with earthquakes, volcanic activities, tectonic plates and converging boundaries. These constant activities cause landslides which effect the environment with both the good and detrimental impacts.
Environment Factors
Full transcript