A B 1.What is / has happened in each photo

Slides:

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Presentation transcript:

A B 1.What is / has happened in each photo 2. Where might they be taken? 3. What links all 4? C D

Key Question: What are the causes of landslides and why do the impacts on people vary? 1979 1981 Key Words: Secondary Hazard Mass Movement Saturated Lateral Blast Think? What has happened to this mountain?

Causes of Landslides Words to use: Stress Gravity Strength mass movement stress down soil Causes of Landslides mass movement Another name for a landslide is a……………….. ……………………. They are ………………….. slope movements of rock, sediment or…………………………………The force…………………………….. is responsible for all mass movements. They occur when the…………………………. is increased on a slope or when the …………………………………… decreases. down soil gravity stress strength Stress Gravity Strength

The Effect of Water Max angle = angle of repose Internal cohesion

2. Water Pore water pressure = liquefaction

Types of Mass Movement Flows

Pick a minimum of 5 and explain how they cause landslides? Strength Stress Increase in water content of slope Increase in slope angle Soft clay soils Shocks & vibrations like earthquakes Weathering Loading the slope with additional weight Alternating layers of varying rock types/lithology Undercutting the slope Burrowing animals Removal of vegetation Think carefully is it stress of strength which changes?

A B What type of mass movement is each? C D

In your notes write as many facts down about each of the case studies

Holbeck Hall Hotel, Scarborough, 1993 Heavy rain Saturated Ground Clays

Aberfan, South Wales 1966 Spoil Heaps Built on spring line

Mt St Helen’s 1980 Lateral Blast Eruption

Karakoram Highway, Pakistan Highly weathered rock Steep Sides Earthquakes common

Now explain for each of the 4 why the landslip occurred? What caused strength to change? What caused stress to change? Extension: Thinking about the levels of economic development in each example, put them in order of worst to least effect on people and explain your 1st and 4th choice!