Ch 6 Review

1. Ch 6 Review Earthquakes

2. Question 1 • The place where slippage first occurs is called an earthquake’s _______. • Focus • Epicenter • Magnitude • intensity

3. Question 1 • The place where slippage first occurs is called an earthquake’s _______. a) Focus

4. Question 2 • The San Andreas Fault zone has formed where the edge of the Pacific plate is slipping • Under the North American Plate • Over the North American Plate • South along the North American Plate • North along the North American Plate

5. Question 2 • The San Andreas Fault zone has formed where the edge of the Pacific plate is slipping d) North along the North American Plate

6. Question 3 • The Pacific Ring of Fire is an earthquake zone that forms a ring around • The Atlantic Ocean • South America • The Pacific Ocean • North America

7. Question 3 • The Pacific Ring of Fire is an earthquake zone that forms a ring around c) The Pacific Ocean

8. Question 4 • When friction prevents the rocks on either side of a fault from moving past each other, the fault is said to be • fractured • subducting • locked • elastic

9. Question 4 • When friction prevents the rocks on either side of a fault from moving past each other, the fault is said to be c) locked

10. Question 5 • Deep-focus earthquakes usually occur in areas in which one plate • Slides past another • Remains stationary against another • Moves apart from another • Subducts under another

11. Question 5 • Deep-focus earthquakes usually occur in areas in which one plate d) Subducts under another

12. Question 6 • Ninety percent of continental earthquakes have • The same depth • A shallow focus • The same type of eruptions • A deep focus

13. Question 6 • Ninety percent of continental earthquakes have b) A shallow focus

14. Question 7 • How far below the earth’s surface do intermediate-focus earthquakes occur? • 10 to 30 km • 30 to 70 km • 70 to 300 km • 300 to 650 km

15. Question 7 • How far below the earth’s surface do intermediate-focus earthquakes occur? c) 70 to 300 km

16. Question 8 • Which type of earthquakes usually occurs farther inland than other earthquakes? • Deep-focus • Shallow-focus • Intermediate-focus • Microquakes

17. Question 8 • Which type of earthquakes usually occurs farther inland than other earthquakes? a) Deep-focus

18. Question 9 • Most earthquakes occur along or near the edges of the • North American Plate • Earth’s oceans and lakes • Eurasian Plate • Earth’s lithospheric plates

19. Question 9 • Most earthquakes occur along or near the edges of the d) Earth’s lithospheric plates

20. Question 10 • Where did the most widely felt series of earthquakes in the United States occur? • Alaska • California • Hawaii • Missouri

21. Question 10 • Where did the most widely felt series of earthquakes in the United States occur? d) Missouri

22. Question 11 • Which type of seismic wave travels the fastest? • Tsunami • P wave • S wave • Surface wave

23. Question 11 • Which type of seismic wave travels the fastest? b) P wave

24. Question 12 • S waves can only travel through • Gases • Solids • Liquids • Gases and liquids

25. Question 12 • S waves can only travel through b) Solids

26. Question 13 • What is the minimum number of seismograph stations a scientist must have data from in order to locate the epicenter of an earthquake? • 1 • 2 • 3 • 4

27. Question 13 • What is the minimum number of seismograph stations a scientist must have data from in order to locate the epicenter of an earthquake? c) 3

28. Question 14 • A major earthquake has a magnitude of • 2.5 to 3.5 • 3.5 to 6.0 • Less than 2.5 • 7 or above

29. Question 14 • A major earthquake has a magnitude of d) 7 or above

30. Question 15 • How many separate sensing devices make up a seismograph? • 1 • 2 • 3 • 4

31. Question 15 • How many separate sensing devices make up a seismograph? c) 3

32. Question 16 • Which of the following generally causes the most damage during an earthquake? • Aftershock • Primary wave • Secondary wave • Surface wave

33. Question 16 • Which of the following generally causes the most damage during an earthquake? d) Surface wave

34. Question 17 • Tsunamis result from earthquakes with epicenter located • On the ocean floor • In loose soil • Along coastlines • In continental faults

35. Question 17 • Tsunamis result from earthquakes with epicenter located a) On the ocean floor

36. Question 18 • What is a tsunami? • A deep-focused earthquake • A shallow-focus earthquake • A type of seismic wave • A giant ocean wave

37. Question 18 • What is a tsunami? d) A giant ocean wave

38. Question 19 • Landslides on the seafloor are most likely to produce • Tsunamis • Fault zones • Seismic gaps • Elastic rebounds

39. Question 19 • Landslides on the seafloor are most likely to produce a) Tsunamis

40. Question 20 • A seismic gap is a region in which • There are no seismographs • Tsunamis never occur • A fault is locked • Only deep-focus earthquakes occur

41. Question 20 • A seismic gap is a region in which c) A fault is locked

42. Question 21 • During an earthquake, a person is most likely to be safe in • A car • An open field • A cellar • A building

43. Question 21 • During an earthquake, a person is most likely to be safe in b) An open field