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Earthquakes

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Transcript

  • 1. Earthquakes
  • 2. What is an Earthquake?• Earthquakes are caused by the movement of rock deep within the Earth’s crust.
  • 3. Energy is Released• Sudden movements that release significant amounts of energy in the form of primary and secondary seismic waves.
  • 4. Focus and Epicentre• The place where the rock movement occurs is called the focus.• The place directly above on the Earth’s surface is called the epicentre.
  • 5. Measuring Earthquakes
  • 6. Richter Scale• Measures the amount of energy released from the earthquake (magnitude) over 6 is considered a major EQ
  • 7. Mercalli Scale• measures the impact on humans (1-12)• Devastation after Earthquake in Haiti 2010
  • 8. Christchurch• Chistchurch Earthquake 22, Feb 2011• Magnitude 6.3• Mercalli 10• http://www.christchurchquakemap.co.nz/• http://www.youtube.com/watch?v=BfcWraeZvcw
  • 9. Over to youUse your and the textbook (p97-98) to answer the followingQuestions.• 1. What types of earthquakes occur in Australia?• 2. Outline some of the impacts of earthquakes.• 3. a) What factors would affect the rating an earthquake receives on the Mercalli Scale ? (e.g the location of the epicentre) b) Outline what can be done to minimise these effects.• 4. Complete “Applying and Analysing” Question 1 on page 101

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