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| 1. |
An earthquake’s source of energy is located at the _____________, but the location at the land surface above that point is called the ______________.
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| 2. |
Identify the indicated earthquake components by selecting the correct response.
For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
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| 3. |
The “focus” and “epicenter” associated with earthquakes are _________ and _________, respectively.
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| 4. |
Match the following basic earthquake terms with the appropriate description:
Using the pulldown boxes, match each item on the left to the corresponding item at right.
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| A. slow and gradual displacement along a fault, usually resulting in little earthquake activity |
| B. the location on the surface of the earth, below which the point of rupture occurred |
| C. a tremor or smaller earthquake that precedes a main larger earthquake |
| D. a tremor or smaller earthquake that precedes a main larger earthquake |
| E. a “snap back” action – the cause of earthquakes |
| F. large fractures in the Earth along which rocks are moved and/or displaced, causing earthquakes |
| G. the source point from which all earthquake energy radiates |
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| 5. |
How is a “fault,” a “focus,” and an “epicenter” related to an earthquake?
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| 6. |
Which of the following best describes “elastic rebound” theory of earthquakes?
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| 7. |
Why do “main” earthquakes have “foreshocks” and “aftershocks”?
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| 8. |
Which of the following would NOT be a situation that would produce an earthquake?
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| 9. |
Which of the following theories is now widely accepted as the most likely mechanism for earthquakes, and why?
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| 10. |
Why are most of the Earth’s earthquakes’ foci located fairly close to the surface, and not farther down?
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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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