Earthquakes- causes and measurements

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  • Created by: vampette
  • Created on: 08-04-14 15:07
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  • Earthquakes
    • Earthquakes are caused by the tension that builds up at all three types of plate margin. The plates eventually jerk past each other, sending out shock waves (vibrations. These vibrations are the earthquake.
      • the shock waves spread out from the focus- the point in the earth where the earthquake starts.
      • The epicentre is the point on the Earth's surface straight above the focus.
    • Earthquakes can be measured using two different scales:
      • The richtor scale
        • The Richtor scale doesn't have an upper scale and it's logarithmic- an earthquake with a magnitude of 5 is ten times more powerful than one with a magnitude of 4.
        • This measures the amount of energy released by an earthquake.
      • The Mercalli scale
        • This measure the effects of an earthquake.
          • These effects can be measured by asking eye witnesses for observations of what happened. Observations can be in the form of words or photos.
        • It's a scale of 1-12


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