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Measuring Earthquakes

Measuring Earthquakes. By: Lily and Assul. Earthquakes. They can release a huge amount of energy or a very little amount It depends on how much rock breaks at a fault It also depends on how far rocks shift Scientists measure earthquakes in two ways: intensity and magnitude. Intensity.

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Measuring Earthquakes

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  1. Measuring Earthquakes By: Lily and Assul

  2. Earthquakes • They can release a huge amount of energy or a very little amount • It depends on how much rock breaks at a fault • It also depends on how far rocks shift • Scientists measure earthquakes in two ways: intensity and magnitude

  3. Intensity • The measure of the amount of the damage the quake produces • Intensity scales depend on observation of earthquake effects • The most widely used intensity scale is the Modified Mercalli scale • It has intensity numbers that run from I (no damage) to XII (almost total destruction)

  4. Intensity Scale

  5. Magnitude • The amount of energy that an earthquake releases • It is a more precise measure of the strength of an earthquake than damage • Magnitude is based on measurement of the maximum motion recorded by a seismograph. • Modern seismograph systems precisely amplify and record ground motion

  6. Richter Scale • Based on seismograph readings • Each increase on the Richter scale is a 10 fold increase in ground shaking • EX: During a magnitude 6 earthquake, the ground shakes twice as much as a magnitude 5 earthquake • Charles Richter invented the Richter scale to measure the magnitude of earthquakes • Invented in 1935

  7. Richter Scale

  8. Quiz Who invented the Richter scale? What two ways do scientists measure Earthquakes? What is the most widely used intensity scale? What is the Richter scaled based on? Why did Charles Richter invent the Richter scale? When was the Richter scale invented?

  9. Credits Miffilin. California Science. Badders. 2007. 152. 1/24 /14 Ammon. Measuring effects. EAS-A193. 2011. WEB 1/27/14

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