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earthquakes ppt


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  • 1. EARTHQUAKES Made by – Janie nakra
  • 2. An earthquake is the sudden shaking of the earth which lasts for a very short time. An earthquake is caused by violent movements of rocks deep inside the earth’s crust. A major earthquake can cause damage to life and property on a
  • 3. List of earthquakes…. 1) 26th Jan 2001 in bhuj district of Gujarat. 2) 8th Oct 2005 in Uri & tang Dhār towns of north Kashmir. 1) 18th September 1737 in Kolkata in west Bengal. 2) 5th March 2012 in new Delhi.
  • 4. Structure of earth..
  • 5. Earthquakes can cause immense damage to houses ,buildings,bridges,dams and people,etc.a lot of people get killed when they get buried under the debris of collapsed houses and other buildings during an earthquake. Damage…..
  • 6. Three layers of earth… The inside of earth is made up of 3 main layers of earth known as: 1)Core: The innermost part of the earth is known as core 2)Mantle: The central region of the earth between the core and crust. 3)Crust: The outermost layer of earth is called crust.
  • 7. Why do they occur? Earthquakes occur when the moving plates of the earth’s crust : 1. Slide past one another 1. Collide with one another
  • 8. What are seismic zones? The weak zones of earth’s crust are called seismic zones or fault zones. Most major earthquakes occur in the well defined seismic zones called earthquake belts.
  • 9. Seismograph It is an instrument which measures and records the magnitude of an earthquake in terms of the shockwaves it produces. Seismograph is also known as seismometer.
  • 10. Focus and Epicenter The place of origin of an earthquake or moonquake is called focus. The part of the earth's surface that is directly above the place where an earthquake starts is called an epicenter.
  • 11. Richter scale An open-ended logarithmic scale for expressing the magnitude of an earthquake.
  • 12. Thanks