## Natural Hazards And Disasters 4th Edition by Donald Hyndman – Test Bank

**Chapter 3**

EARTHQUAKES AND THEIR CAUSES

**MULTIPLE-CHOICE QUESTIONS **

- What is the approximate highest frequency of vibration (of back-and-forth shaking) in earthquakes?

- 2-3 cycles per minute
- 2-3 cycles per second
- 20-30 cycles per second
- 2,000-3,000 cycles per second
- 20,000-30,000 cycles per second

ANSWER: c

- Which type of earthquake waves shake with the largest amplitudes (largest range of motion)?

- compressional waves
- shear waves
- surface waves
- P waves
- S waves

ANSWER: c

- How is the distance to the source of an earthquake determined?

- by calling many seismograph operators to see who felt it most strongly
- by subtracting the travel times of P and S waves
- by measuring the frequency of the P waves as they arrive at a seismograph
- by measuring the height of the S waves recorded on a seismograph
- by adding the travel times of the L waves and the Raleigh waves

ANSWER: b

- What does the Richter Magnitude Scale depend on?

- the maximum amplitude of earthquake waves on a seismograph
- the frequency of P waves recorded on a seismograph
- the intensity of shaking during the earthquake
- the amount of destruction by the earthquake
- the distance to the earthquake focus

ANSWER: a

5.A magnitude 7 earthquake has how much higher ground motion than a magnitude 6 earthquake on a seismogram?

- twice as high
- 10 times higher
- 32 times higher
- about 100 times higher
- about 1,000 times higher

ANSWER: b

- Which type or types of earthquake waves move only near the surface of the Earth?

- all earthquake waves
- P waves
- surface waves
- S waves
- waves from faults that break near-surface rocks

ANSWER: c