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Earthquake
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  • 1. ALBA ARRANZGARCÍA 4ºA
  • 2. What is an earthquake?
    • It is a sudden, rapid shaking of the Earth caused by the breaking and shifting of rock beneath the Earth´s surface and it creates seismic waves.
    • http://www.youtube.com/watch?v=-zNyVPsj8zc&feature=related
  • 3. How we measure earthquakes?
    • We can measure the magnitude and the intensity of an earthquake and we have a scale for each one.
    • Richter scale : Is a seismic scale which measure the magnitude of an earthquake.
    • Mercalli scale: Is a seismic scale which measure the intensity of an earthquake.
    • The instrument that is used for measure an earthquake is called seismograph.
  • 4. Where earhtquakes occur?
    • Earthquakes usually occur in plate boundaries (Convergent, Divergent and Transform) and faults ( Normal, Reverse and Strike-slip).
    • The Hypocentre or focus is the point inside the Earth where the earthquake occur.
    • The Epicentre is the first place on the surface of the Earth where the seismic waves arrived.
  • 5. TIPES OF WAVES
    • P waves:
    • -Primary waves
    • -Compresional waves
    • -Longitudinal in nature
    • -Are pressure waves initial in earthquakes
    • -Could travel through any tipe of materia
    • -They travel as speed of the sound
    • S waves:
    • -Secondary waves
    • -Shear waves
    • -Transverse in nature
    • -Follow the P waves in straight line
    • -Only travel throuhg solids.
    • -They travel half speed of P waves
  • 6. Efects of the Earthquake
    • When the earthquake is produce inside an ocean or a sea is called Tsunami and beacaus the shaking big waves are produced.
    • Because of the greats shakings of earthquakes ground ruptures are produced.
    • They can produces avalanches because of the shaking snow, rocks, etc that are at the top or in a ramp fall down.
  • 7. Seismic risk areas
    • If lot of earthquakes are produced in an area in few time it is a seismic risk area .
    • Most of the risk areas are found in plate boundaries.
    • Some risk areas are California, Alaska, italy, Greece, Turkey, some parts of the centre of Asia, New Zaland and Japan.
  • 8.