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Measuring Earthquakes (Grade 8)

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Measuring Earthquakes

1. 
Geologists estimate the probability of a future earthquake, but they are unable to accurately predict the timing of that earthquake.
  1. True
  2. False
2. 
The amount of energy released by an earthquake is measured by its
  1. speed
  2. magnitude
  3. focus
  4. intensity
3. 
This measurement of an earthquake will change as distance from the epicenter of an earthquake changes.
  1. Magnitude
  2. Size
  3. Scale
  4. Intensity
4. 
What is the point on the surface of the Earth where an earthquake is felt with the most intensity?
  1. hypocenter
  2. focus
  3. epicenter
  4. seismic station
5. 
How many seismic stations are required to locate the epicenter of an earthquake?
  1. 1
  2. 2
  3. 3
  4. 4
6. 
What instrument is typically used to measure seismic waves?
  1. sonograph
  2. seismograph
  3. simograph
  4. radar
7. 
Scientists who measure earthquakes are called:
  1. seismic scientists
  2. seismometers
  3. seismologists
  4. earthquake technicians
8. 
The scale used to measure an earthquake's intensity or destruction, ranging from 1-12, is called the
  1. Richter scale
  2. Earthquake scale
  3. Magnitude scale
  4. Mercalli scale
9. 
To determine the epicentral distance, scientists consider the arrival times of which wave types?
  1. surface waves and S-waves
  2. surface waves and P-waves
  3. P-waves and S-waves
  4. none of the above
10. 
                  is a logarithmic scale used to express the total amount of energy released by an earthquake.
  1. Modified Mercalli
  2. Epicenter
  3. Seismograph
  4. Richter Scale
11. 
Earthquake waves arrive at seismic stations in what order?
  1. P-waves, then S-waves, then surface waves
  2. S-waves, then P-waves, then surface waves
  3. S-waves, then surface waves, then P-waves
  4. Surface waves, then P-waves, then S-waves
12. 
Imagine that you are visiting two areas that experienced earthquakes within the last month. The first location had an earthquake with a magnitude of 3.9 and an intensity of III. The second location experienced an earthquake with a magnitude of 7.3 and an intensity of IX. What differences do you see when you compare the two areas?



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