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| 1. |
Which of the following is the direct measure of the distance from a seismic receiving station to the focus of a distant earthquake, and why?
[Hint]
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| 2. |
Match the earthquake scale with its description:
[Hint]
Using the pulldown boxes, match each item on the left to the corresponding item at right.
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| A. can be calculated by several techniques, but most commonly by using very long-period waves |
| B. based upon the damage an earthquake has had – varies with distance to the epicenter |
| C. used for deep-focus earthquakes and for earthquakes that are at great distances from the station |
| D. based upon the amplitude of the largest seismic wave on a seismogram |
| E. based upon the largest amplitude surface wave having a period close to 20 seconds |
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| 3. |
What is perhaps the only real benefit of an “intensity” scale for earthquakes, instead of a “magnitude” scale?
[Hint]
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| 4. |
Which of the following is NOT a “downfall” of an “intensity” scale for earthquakes?
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| 5. |
According to the design of earthquake magnitude scales, approximately how much more energy is released in a 6.5 Richter magnitude earthquake than in one with a magnitude 5.5?
[Hint]
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| 6. |
Why is the “moment magnitude” scale, not the Richter scale, the most adequate for very large earthquakes?
[Hint]
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Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.
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