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Slides to present basic facts about earthquakes. Easy vocabulary and explanations for secondary students.

Slides to present basic facts about earthquakes. Easy vocabulary and explanations for secondary students.



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Earthquakes Presentation Transcript

  • 1. Earthquakes
  • 2. Important Vocabulary Let’s learn some vocabulary before learning about earthquakes! Extender Spread Daño Damage Liberar Release Riesgo Risk Puntuar Rate Sismógrafo Seismograph Derribar Knock down Placa Plate Sacudir Shake Ola Wave Deslizarse Slide Corteza Crust Chocar contra Bump into Escala Scale Medida Measure Placa tectónica Tectonic plate
  • 3. Earthquakes happen when the moving tectonic plates that make up the surface of the Earth move apart or bump into each other, or slide under each other. Most often, this just means a little shaking for a few seconds, and nothing very serious happens.
  • 4. Several times a year, somewhere in the world there is enough movement to shake the earth a lot, and the earthquake knocks down buildings. When the buildings fall on people, many people can be killed in a few minutes. The strongest earthquakes can break trees in half.
  • 5. The Richter scale (or ML scale) rates earthquakes on an exponential scale, so that if an earthquake is rated 1, you can hardly feel it, but an earthquake rated 2 is ten times as strong as an earthquake rated 1, and an earthquake rated 3 is ten times as strong as an earthquake rated 2.
  • 6.
  • 7. How is an earthquake produced?
  • 8.
    • An earthquake is caused by a sudden release of energy in the crust. This energy travels in seismic waves. There are two main types:
    • body waves : they can travel through the earth's inner layers.
    • surface waves : they can only move along the surface of the planet.
    Seismic waves
  • 9.
    • The point within Earth where faulting begins is the focus , or hypocenter .
    • The point directly above the focus on the surface is the epicenter .
  • 10. Seismographs record earthquake events.
  • 11. Where do earthquakes occur and how often?
    • 80% of all earthquakes occur in the circum-Pacific belt.
    • 15% occur in the Mediterranean-Asiatic belt.
      • 5% occur in the interiors of plates and on spreading ridge centers.
  • 12. How can we reduce damage by earthquakes? REDUCE DAMAGE PREDICTION Studying the possibility of damage. Using risk maps. PREPAREDNESS Safety measures adopted: Building designs. Population is shown what to do. Police and fire services training.
  • 13.