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Earthquake
 

Earthquake

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    Earthquake Earthquake Presentation Transcript

    • ALBA ARRANZGARCÍA 4ºA
    • 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
    • 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.
    • 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.
    • 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
    • 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.
    • 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.
    •