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CAL LESSON

Learn about the causes of earthquakes, the role of plate tectonic stresses, earthquake waves, and the resulting damages such as landslides, building damage, liquefaction, and other disasters like tsunamis, fires, and floods.

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CAL LESSON

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  1. CAL LESSON • CLASS - V • SUB - EVS • LESSON - WHEN THE EARTH SHOOK ! BY Dr.C.RAJMOHAN,PRT KV,THIRUVARUR.

  2. EARTHQUAKES:WHY? AND HOW?

  3. EARTHQUAKES sudden movement or shaking of the Earth • Caused by plate tectonic stresses • Located at plate boundaries • Resulting in breakage of the Earth’s brittle crust

  4. PLATE TECTONIC STRESSES

  5. EARTHQUAKE DAMAGE • Landsides • Building damage • Liquefaction

  6. LIQUEFACTION when a solid (sand and soil) becomes saturated with water and acts like a heavy liquid • Results in a loss of soil strength & the ability of the soil to support weight

  7. EARTHQUAKE DAMAGE Most caused by SURFACE waves (arrive last)

  8. EARTHQUAKE WAVES Seismographs record earthquake waves

  9. EARTHQUAKE WAVES P waves move through solids & liquids S waves move through solids only!!!

  10. EARTHQUAKE WAVES Lets test your understanding!! Is this a P or an S wave? P wave! S Wave

  11. The effects of earthquakes also include other disasters such as, • TSUNAMI • FIRE • FLOOD

  12. TSUNAMI • The tsunami of the 2004 Indian Ocean earthquake

  13. FIRE Earthquakes can cause fires by damaging electrical power or gas lines

  14. FLOOD •  Earthquakes may cause landslips to dam rivers, which collapse and cause floods.

  15. Thank you

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