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Earthquakes - PowerPoint PPT Presentation


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Earthquakes. How do we measure an Earthquake?. We can measure Earthquakes using one of two main scales. Richter Scale Mercalli Scale. Mercalli Scale. In 1902 Guiseppe Mercalli devised a scale for measuring the intensity of an earthquake by relating it to the amount of damage it caused.

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PowerPoint Slideshow about 'Earthquakes' - makenna-goulding


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Presentation Transcript
how do we measure an earthquake
How do we measure an Earthquake?
  • We can measure Earthquakes using one of two main scales.
    • Richter Scale
    • Mercalli Scale
mercalli scale
Mercalli Scale
  • In 1902 Guiseppe Mercalli devised a scale for measuring the intensity of an earthquake by relating it to the amount of damage it caused.
  • In 1931 seismologists modified his scale to adapt to modern American building standards.
finding the epicenter
Finding the Epicenter
  • We can use Mercalli’s modified scale to find the epicenter of an earthquake.
  • Today’s activity is a dramatization based on an actual earthquake that occurred in Wattsville, California in 1971.
  • The next few slides are recordings from a local radio station that had callers phone in observations that they could make from their location.
final task
Final Task
  • Now that you are finished marking down the number on the Mercalli scale for each location you want to begin to connect similar numbers on your map.
  • Be sure to look over your map carefully and draw lines that contain each number.

SEE EXAMPLE

  • Put a star where you think the epicenter would be located.