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Measuring Earthquakes

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Measuring Earthquakes Answer Key

Geologists estimate the probability of a future earthquake, but they are unable to accurately predict the timing of that earthquake.
  1. True
  2. False
The amount of energy released by an earthquake is measured by its                .
  1. speed
  2. magnitude
  3. focus
  4. intensity
This measurement of an earthquake will change as distance from the epicenter of an earthquake changes.
  1. Magnitude
  2. Size
  3. Scale
  4. Intensity
What is the point on the surface of Earth where an earthquake is felt with the most intensity?
  1. hypocenter
  2. focus
  3. epicenter
  4. seismic station
How many seismic stations are required to locate the epicenter of an earthquake?
  1. 1
  2. 2
  3. 3
  4. 4
What instrument is typically used to measure seismic waves?
  1. sonograph
  2. seismograph
  3. simograph
  4. radar
Scientists who measure earthquakes are called
  1. seismic scientists.
  2. seismometers.
  3. seismologists.
  4. earthquake technicians.
The scale used to measure an earthquake's intensity or destruction, ranging from 1-12, is called the                 Scale.
  1. Richter
  2. Earthquake
  3. Magnitude
  4. Mercalli
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
                  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
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
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?
  • I can see no remaining effects of the earthquake in the first location. Any damage would be too small or would be repaired. In the second location, many buildings are in shambles. Many underground pipes burst and there is fire damage. The damage from the quake is both great and widespread.
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