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Hazardous Environments resulting from Mass Movements.

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Presentation on theme: "Hazardous Environments resulting from Mass Movements."— Presentation transcript:

1 Hazardous Environments resulting from Mass Movements

2 Mass movements take place when shear stress (the force trying to move the material) is greater than shear strength (the strength or resistance of the slope). Shear stress> shear strength

3 Causes of Mass Movement Movement is determined by: Gravity Slope angle Pore pressure

4 Hazardous mass movements Landslides Mudslides Avalanches

5 landslides Triggered by Seismic activity Heavy rainfall Human activity Case studies of the Caribbean Case study of Puerto Rico Case study of China

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15 mudslides Triggered by Human causes – uncontrolled building, creation of impermeable surfaces, deforestation, burning. Heavy rainfall Tectonic activity Case studies – Italy 1998, Venezuela

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27 avalanche Mass movement of ice and snow Triggered by: Newly fallen snow falling off older snow Partially thawed snow in spring Steep slopes North-facing slopes (NH)

28 Classification of avalanche: Type of breakaway Position of sliding surface Water content Form of avalanche – open or channelled. Case studies – Europe 1999.

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