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Earthquakes presentation bn

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  • 1. Earthquakes Kevin Melo. Listening and Speaking V
  • 2. Vocabulary Forecast: to estimate how something will be in the future Fault: A fracture zone in rock along which movement has occurred. Magnetometer: An instrument designed to measure the strength and character of Earth's magnetic field. Seismograph: an instrument that automatically detects and record the intensity, direction and duration of earthquake and similar events. Layer: a single thickness of some material covering a surface
  • 3. Earthquakes are caused by movements of plates underneath the Earth's surface. The places where these plates meet are breaks in the Earth's crust called faults. Earthquakes often happen when these plates along the faults move in different directions
  • 4.  The San Andreas Fault: is a long transform fault in California. Movements along this plate edge have caused huge earthquakes in the cities of San Francisco and Los Angeles  Usually active volcanoes occur near the edges of plates that are moving apart or colliding. Also earthquakes are common in these regions too. (Ring of fire)
  • 5. Is Possible Predict Earthquakes? In 1975, Chinese scientists correctly predicted an earthquake and saved their the lives of many people. But scientists have not yet found sure way of forecasting them
  • 6. What Instruments Record Earthquakes? Magnetometer to warn of magnetic field changes Seismograph to warn of underground vibrations
  • 7. Animals Sense Earthquakes Scientist have noticed that animals often behave strangely before an earthquake. Horses rear up, dogs bark and snakes come out of holes in the ground.
  • 8. Seaquake (tsunami) A Seaquake is a series of large waves of extremely long wavelength and period usually generated by a violent, impulsive undersea disturbance or activity near the coast or in the ocean.
  • 9. How do earthquakes cause damage?  Earthquakes make buildings sway and wobble until they collapse. The shaking sometimes:  Break gas pipes  Causes electrical short-circuits  Starting fires
  • 10. Haiti - January 12, 2010 316.000 people lost their lives Magnitude 7.1
  • 11. Chile - February 27, 2010 525 people lost their lives Magnitude 8.8
  • 12. San Francisco, USA - October 17, 1989 63 people lost their lives Magnitude 6.9
  • 13. Tumaco, Colombia - December 12, 1979 525 people lost their lives Magnitude: 8.1
  • 14. Thanks