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Earth hazards revision




Mass movement case study: Vajont dam disaster, Italy, October 1963

Effects

2000 deaths
Land below dam destroyed by a thick layer of mud flattening the valley.
200m wave destroyed several villages below the dam
Power supply destroyed, moments before wave struck the villages, plunging
them into darkness…

Page 2

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Earth hazards revision




The possibility of a major landslide was ignored even though one had
occurred in the past and hence the left bank was unstable. A seismic
investigation involving 3 bore holes drilled found no sign of weakness, so it
was assumed the valley was safe and stable. Ignoring…

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