Landslides, earthquakes and tsunamis
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Landslides, earthquakes and tsunamis

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Landslides, earthquakes and tsunamis Landslides, earthquakes and tsunamis Presentation Transcript

  • LANDSLIDES, EARTHQUAKES AND TSUNAMISExamples of Mass Movement
  • Landslides Landslide is the sliding down of a mass of earth or rock from a mountain or cliff (Georgina) Landslides often occur after heavy rain (Jess) Landslides could be caused by an earthquake (Anjali) Landslides can also be caused by human activity (Ms Williams)
  • Protecting against landslidehazard It may be possible to predict a landslide based on previous events and current weather conditions (Yasmeen) Planting trees and shrubs may help to stabilised ground (Cameron) Building barriers could protect people (Nika) Building zones and codes could help to keep houses safer (Danielle)
  • An example of a landslide:Thredbo  1997  Two ski lodges were destroyed  18 people killed  Caused by suspected leaking underground pipes and a poorly maintained road
  • Earthquakes Caused by movement of tectonic plates (Danielle) Large tremors felt on the earth’s surface. (Small earthquakes are called tremors). (Mya) Duration of earthquake is dependent on the movement of broken rocks between tectonic plates – and the size of the tectonic movement (Yasmeen) Earthquakes are measured on the Richter Scale (Cameron)
  • Protecting against earthquakehazard Serious earthquakes aren’t common in Australia because of our location on the continental plates (Scott) It’s difficult to predict earthquakes, but seismologists do monitor activity (Yasmeen) It is possible to build buildings that are better suited to withstand an earthquake (Mya)
  • An example of an earthquake:Newcastle 1989 5.6 on the Richter scale 13 people were killed
  • Tsunami Occur as a result of a shift in tectonic plates under or near the ocean (Paige & Scott) The waves radiate from the epicentre in all directions; the further they travel, the weaker they get. (Forbes) Australia’s risk of tsunami is relatively low, due to our location. Signs to watch for: shaking ground; watch for receding water; listen for the roar
  • Protecting against tsunamihazard Bouys in the water to transmit messages notifying of higher ocean movement. (Nika & Inga) Planning regulations, to reduce number of houses in areas likely to be impacted by tsunami (Mya) If warned, move to higher ground (Forbes)
  • An example of a tsunami:Indian Ocean Boxing Day 2004 Largest, most destructive tsunami on record Over 200.000 people killed Indonesia was most badly effected; much of south-east Asia was impacted upon; countries as far away as Africa were also hit