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Lesson 4

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  • 1. Earthquakes
  • 2. What is an earthquake
  • 3. What is an earthquakeEarthquake: Sudden movement of the Earth’s crust
  • 4. What is an earthquakeEarthquake: Sudden movement of the Earth’s crustEarthquakes occur when rock that is stuck togethersuddenly slips
  • 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. 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. 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. What waves do Earthquakes make
  • 9. What waves do Earthquakes makeSeismometer: Is an instrument that detects andmeasures waves produced by an earthquake
  • 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. How is an earthquakes energy measured
  • 12. How is an earthquakes energy measuredMagnitude: This is the measure of the amountof energy released by an earthquake
  • 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. 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. 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. Tsunamis
  • 17. TsunamisEarthquakes that occur underwater cause these
  • 18. TsunamisEarthquakes that occur underwater cause theseTsunamis are huge waves that are produced bythe earthquakes
  • 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. How can people prepare
  • 21. How can people prepareNew construction methods
  • 22. How can people prepareNew construction methodsRubber and steel between building andfoundation