How many strong earthquakes happen every year?

Related questions

1. How many aftershocks are in Anchorage today?
2. What causes an aftershock?
3. Is it normal to have earthquakes everyday?
4. How far can a 4.4 earthquake be felt?
5. Do earthquakes always have aftershocks?
6. What should we not do during earthquake?
7. Do aftershocks get stronger?
8. How far can an earthquake be felt?
9. Are there more earthquakes now than in the past?
10. Why are aftershocks more dangerous than mainshock?

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7. #greater
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9. #month
10. #times
11. #earthquakes
12. #occur
13. #smaller
14. #magnitude
15. #those
16. #major
17. #several
18. #happen
19. #reflected