Lesson 4

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Lesson 4

  1. 1. Earthquakes
  2. 2. What is an earthquake
  3. 3. What is an earthquakeEarthquake: Sudden movement of the Earth’s crust
  4. 4. What is an earthquakeEarthquake: Sudden movement of the Earth’s crustEarthquakes occur when rock that is stuck togethersuddenly slips
  5. 5. What is an earthquakeEarthquake: Sudden movement of the Earth’s crustEarthquakes occur when rock that is stuck togethersuddenly slipsFOCUS: Where the slipping rock begins
  6. 6. What is an earthquakeEarthquake: Sudden movement of the Earth’s crustEarthquakes occur when rock that is stuck togethersuddenly slipsFOCUS: Where the slipping rock beginsEPICENTER: Point on earth’s surface where wavesstart spreading out
  7. 7. What is an earthquakeEarthquake: Sudden movement of the Earth’s crustEarthquakes occur when rock that is stuck togethersuddenly slipsFOCUS: Where the slipping rock beginsEPICENTER: Point on earth’s surface where wavesstart spreading outEarthquakes happen along boundaries of tectonicplates
  8. 8. What waves do Earthquakes make
  9. 9. What waves do Earthquakes makeSeismometer: Is an instrument that detects andmeasures waves produced by an earthquake
  10. 10. What waves do Earthquakes makeSeismometer: Is an instrument that detects andmeasures waves produced by an earthquakeThree types of Waves: P Waves: Primary waves: fastest, and they travel through both solid and liquids S Waves: Secondary Waves: Move only through solids Surface Waves: Slowest moving waves, and travel along earths surface and cause damag
  11. 11. How is an earthquakes energy measured
  12. 12. How is an earthquakes energy measuredMagnitude: This is the measure of the amountof energy released by an earthquake
  13. 13. How is an earthquakes energy measuredMagnitude: This is the measure of the amountof energy released by an earthquakeRichter Scale measures magnitude at theepicenter
  14. 14. How is an earthquakes energy measuredMagnitude: This is the measure of the amountof energy released by an earthquakeRichter Scale measures magnitude at theepicenterMercalli scale measures what people feel
  15. 15. How is an earthquakes energy measuredMagnitude: This is the measure of the amountof energy released by an earthquakeRichter Scale measures magnitude at theepicenterMercalli scale measures what people feelAftershocks: Earthquakes with lesser magnitude
  16. 16. Tsunamis
  17. 17. TsunamisEarthquakes that occur underwater cause these
  18. 18. TsunamisEarthquakes that occur underwater cause theseTsunamis are huge waves that are produced bythe earthquakes
  19. 19. TsunamisEarthquakes that occur underwater cause theseTsunamis are huge waves that are produced bythe earthquakesTsunamis only happen after a 6.5 or largerearthquake occur
  20. 20. How can people prepare
  21. 21. How can people prepareNew construction methods
  22. 22. How can people prepareNew construction methodsRubber and steel between building andfoundation

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