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Earthquakes and Richter scale


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Earthquakes and Richter scale

  1. 1. Lesson objectives: Knowledge: All will understand how earthquakes are measured. Most will explain how seismic waves travel and the damage they can cause. Skills: All will evaluate where earthquake damage is greatest and explain why Some will research how the damage from earthquakes can be managed
  2. 2. Keywords for today's lesson: Epicentre Focus Seismic Seismograph Richter scale
  3. 3. Who? What? When? Where? Why? How?
  4. 4. Let’s remind ourselves how earthquakes happen:
  5. 5. Most earthquake damage happens near the epicentre
  6. 6. How are earthquakes measured?
  7. 7. • Complete the measuring earthquakes worksheet using the key words Key Words Magnitude Seismometer Energy Richter Scale Image:
  8. 8. How are earthquakes measured? 1 2 3 4 6 5 9 8 7 10 Richter Scale The largest earthquake ever recorded was in Chile. It measured 9.5 on the Richter Scale. The Richter Scale This measures the magnitude of a tremor (how powerful it is) using an instrument called a seismograph. The Richter Scale is measured on a scale from 1 to 10. It is a logarithmic scale which means that a size ‘6’ on the Richter Scale is 10 times more powerful than a size ’5’ and 100 times more powerful than a size ‘4’.
  9. 9. The Richter Scale: 0 - 1.9 Can be detected only by a Seismograph 2 - 2.9 Hanging objects (lampshade) may swing 3 - 3.9 Comparable to the vibrations of a passing lorry 4 - 4.9 May break windows or cause small objects in your home to fall 5 - 5.9 Furniture moves, chunks of plaster may fall from the walls 6 - 6.9 Damage is caused to well built structures and severe damage to poorly built structures 7 - 7.9 Buildings are displaced from foundations and there are visible cracks in the earth 8 - 8.9 Bridges are destroyed and few structures are left standing 9 and over Near total destruction and seismic waves are visible to the naked eye (don’t worry, this rarely happens!)
  10. 10. Where on the scale is it and explain your choice: 1. 2. 3. 4.
  11. 11. Explain in your books in your own words ... What is the Richter Scale?
  12. 12. A. B. 1. Will the vibrations be greater at A, or B? Why? 2. Will the damage be greater at A or at B? Why? 3. An earthquake can occur at any time of day. When might an earthquake do more harm? At 5am OR b) at 10.30am Explain your answer. Earthquake Damage Task Image adapted from:
  13. 13. Plenary: Match up the correct keyword with its meaning. Earthquake the scale used to measure the severity of earthquakes Conservative Margin an instrument to measure earthquakes. Plate Boundaries a movement or tremor in the earths crust. Destructive Margin where two plates move alongside each other. Seismograph where two plates are destroyed as they push towards one another. Richter Scale the centre point of the earthquake on the earths surface. Epicentre a boundary between two plates.