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Earthquakes msf
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  • 1. EarthquakesEarthquakes Did you know…? … that there are aproximately 6000 earthquakes every year in the world? Only a few are powerful enough to cause significant damage.
  • 2. What happens in an earthquake?What happens in an earthquake? The most violent earthquakes occur near the plate boundaries. The plates often stick together and then suddenly jolt appart, causing an earthquake.
  • 3. What causes earthquakes?What causes earthquakes? The place underground where the rock breaks is known the focus. The place at the surface, directly above the focus, is called the epicentre. Seismic waves ripple outwards from the epicentre in all directions.
  • 4. Tectonic plates are locked together by friction Pressure builds up due to movement in the mantle The rock breaks along a weak point (fault line) The tectonic plates suddenly move Stored energy is released as seismic waves The Earth’s surface shakes
  • 5. Impact of earthquakesImpact of earthquakes • Structural damage Primary effects: hazards right • Falling objects after an earthquake strikes • Fire • Tsunamis Secondary effects: problems hours/ • Disease days after earthquake • Economy
  • 6. Recording earthquakesRecording earthquakes Earthquakes are recorded using very sensitive instruments: seismometeres The vibrations they detect are drawn on a seismograph. The print out tells us how powerful the earthquake was and how long it lasted.
  • 7. How do we measure an earthquake?How do we measure an earthquake? We use the Richter Scale to measure the total amount of energy released in the earthquake. It tells us how strong it was - 1 being weak and 10 being absolute devastation.