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ALBA  ARRANZGARCÍA 4ºA
What is an earthquake? <ul><li>It is a sudden, rapid shaking of the Earth caused by the breaking and shifting of rock bene...
How we measure earthquakes? <ul><li>We can measure the magnitude and the intensity of an earthquake and we have a scale fo...
Where earhtquakes occur? <ul><li>Earthquakes usually occur in plate boundaries (Convergent, Divergent and Transform) and f...
TIPES OF WAVES <ul><li>P waves: </li></ul><ul><li>-Primary waves </li></ul><ul><li>-Compresional waves </li></ul><ul><li>-...
Efects of the Earthquake <ul><li>When the earthquake is produce inside an ocean or a sea is called  Tsunami  and beacaus t...
Seismic risk areas <ul><li>If lot of earthquakes are produced in an area in few time it is a  seismic risk area .  </li></...
 
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Earthquake

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Transcript of "Earthquake"

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