Chapter 11: Earthquakes

Concept #3 Quiz

Choose the best possible answer to the following questions about Key Concept 3 "Measuring the size of earthquakes."


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]


Match the earthquake scale with its description: [Hint]

Using the pulldown boxes, match each item on the left to the corresponding item at right.

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

3. What is perhaps the only real benefit of an “intensity” scale for earthquakes, instead of a “magnitude” scale? [Hint]

4. Which of the following is NOT a “downfall” of an “intensity” scale for earthquakes?  

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]

6. Why is the “moment magnitude” scale, not the Richter scale, the most adequate for very large earthquakes? [Hint]

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