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L4 ap earthquakes

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  • 1. What are earthquakes and how are they formed? Video here What are earthquakes and how are they formed?
  • 2. What are earthquakes and where do they occur? They can occur at all 4 major plate boundaries but the most severe earthquakes are normally found at CONSERVATIVE and DESTRUCTIVE boundaries. CONSERVATIVE DESTRUCTIVE
  • 3. Your Turn! _____________ are caused when two _________ moving past each other become ‘stuck’ for a while, so ______ builds up. Eventually the stress becomes so great that the ______ breaks and moves suddenly. The point where the ______ actually breaks is called the _______ , which is __________________. The point on the surface directly above the focus is called the ________ . When plates move suddenly ________ waves are sent out which can cause a lot of _________. epicentre tension focus shock plates underground crust damage Earthquakes rock
  • 4. How can we measure earthquakes? Earthquakes are measured using the Richter Scale. This measures the magnitude of a tremor (how powerful it is) using an instrument called a seismograph. Although the Richter Scale has no upper limit, the largest known shocks have had magnitudes in the 8.8 to 8.9 range. It is a logarithmic scale which means that a size ‘6’ on the Richter Scale is 10 times larger than a size ’5’ and 100 times larger than a size ‘4’. What are earthquakes and how are they formed?
  • 5. What are earthquakes and how are they formed?
  • 6. A seismograph What are earthquakes and how are they formed?
  • 7. TASK • In pairs complete a story board for a BBC documentary showing how earthquakes occur. • Sketch out what would be in 8 of the different scenes from your programme, include a written description of what is happening. What are earthquakes and how are they formed? http://www.bbc.co.uk/bitesize/ks3/geography/ physical_processes/plate_tectonics/activity/