Earth quakes 2

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Earth quakes 2

  1. 1. EarthquakeAn earthquake (also known asa tremor or temblor) is the result of a suddenrelease of energy in the Earths crust thatcreates seismic waves
  2. 2. Earthquakes strike suddenly, without warningEarthquakes can occur at any time of the yearand at any time of the day or nightOn a yearly basis, 70 to 75 powerfulearthquakes occur throughout the worldAn earthquake is a sudden, rapid shaking ofthe Earth caused by the movement of hugeplates that form the surface of the Earth
  3. 3. Sometimes the plate movement is gradualAt other times, the plates are locked together,unable to release the accumulating energyThe plates break free causing the ground toshake
  4. 4. Most earthquakes occur at the boundarieswhere the plates meet
  5. 5. Some earthquakes occur in the middle ofplatesAn earthquake is just like throwing a stone ina pond of water
  6. 6. The point of disturbance below the surface ofthe Earth is called, FOCUS
  7. 7. The point directly above the FOCUS on thesurface of the Earth is called, EPICENTRE
  8. 8. The vibrations are called SEISMIC WAVES
  9. 9. The study of earthquake waves is known asSEISMOLOGYThe experts who study the pattern ofearthquakes are known as SEISMOLOGISTSThe machine which records the intensity ofearthquake is known as SEISMOGRAPH
  10. 10. The recordings of the SEISMOGRAPH areconverted into the actual intensity of thequake by using RICHTER SCALE
  11. 11. Earthquakes measuring above Charles RichterRichter scale was invented by 6 on the scaleare very destructivein 1935Earthquakes are experienced in the sameregions where volcanoes are situated
  12. 12. Earthquake in INDIAHimalayan region is prone to earthquakesDeccan plateau had earthquakes rarely and isconsidered safe from earthquakes
  13. 13. Some destructive earthquakes rocked IndiaUttarkashi (Uttarkhand)1991Latur (Maharashrta)1993Jabalpur (Madhya Pradesh) 1997Chamoli (Uttarkhand) 1999 Bhuj (Gujarat) 2001Jammu & Kashmir 2005Pak- Occupied Kashmir 2007
  14. 14. Assignment for the dayDefine earthquake.W hat is the reason for the shaking of theearth?W is focus? hatW is epicentre? hatDefine seismic waves? How do they travel?Explain the measurement of earthquakes.W do earthquakes take place in the plate hyboundaries?
  15. 15. Kobe Earthquake, 17 jan 1995Japan is a country affected by earthquakes.It is located where the EURASIAN plate, PACIFICplate and the PHILIPPINE plate meet.

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