L8 earthquakes

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L8 earthquakes

  1. 1. How do we measure earthquakes?
  2. 2. Epicentre and focus video • Watch it here • A = • B =
  3. 3. How can we measure earthquakes? • There are two ways of measuring earthquakes; 1. The Richter Scale 2. The Mercalli Scale How do we measure earthquakes?
  4. 4. 1. Richter Scale • On the Richter Scale, magnitude is expressed in whole numbers and decimal fractions. • 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’. • Measured using a seismograph or seismogram. How do we measure earthquakes?
  5. 5. How do we measure earthquakes? A seismograph - video
  6. 6. 2. Mercalli Scale • Based on the effects of an earthquake. • The scale goes from 1to 12 How do we measure earthquakes?
  7. 7. Have a go at this past question
  8. 8. Swap answers and peer assess
  9. 9. Earthquake recap: When will an earthquake cause the most damage? Powerful earthquake, causes a lot of damage Weak earthquake, Doesn’t cause much damage Distance from the epicentre The state of preparation for an earthquake (country) Population density Type of land the area is built on Time of the day Time of the year

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