Earthquakes

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  • Created by: abi
  • Created on: 05-04-13 19:51
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  • Earthquakes
    • Destructive
      • plates move towards eachother
      • Oceanic plate + continental plate. Denser oceanic is forced down into the mantle  and destroyed
    • Constructive
      • plates move away from eachother
        • They eventually jerk past each other, sending out shock waves. These vibrations are the earthquake.
          • plates move towards eachother
          • Nearest to the focus the waves are stronger - cause more damage
      • Magma rises to fill the gap and new land is formed. 
    • Conservative
      • plates slide past eachother
        • They eventually jerk past each other, sending out shock waves. These vibrations are the earthquake.
          • Nearest to the focus the waves are stronger - cause more damage
      • Or are moving in the same direction at different speeds. 
    • An earthquakes is the shaking vibration of the earth's crust due to movement of the earth's plates. When plates stick together, pressure builds up and causes a violent earthquake
    • Epicentre - The point on the Earth's surface, directly above the focus. 
    • Focus - The point in the Earth where the earthquake starts. 
    • Plates
      • The centre of the earth is the core
      • Inner - ball of solid iron and nickel. 
      • Outer - liquid. Around it is the mantle, which is semi- molten rock.
    • Liquefaction    
      • Shockwaves can cause groundwater to rise to the surface turning soft ground to mud. Any buildings built on clay, will sink and collapse.
    • Measuring Earthquakes
      • Richter scale 
        • Measures the magnitude by using a seismometer
      • Mercalli scale
        • Measures the effects. Scale of 1-12

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