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Lab 4

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1.
What time in hours:minutes:seconds GMT did the P waves arrive? (See Lab Exercise #1, Step 1, Question 1)
A) 01:48:00
B) 01:49:00
C) 01:50:00
D) 01:51:00

2.
What time in hours:minutes:seconds GMT did the S waves arrive? (See Lab Exercise #1, Step 1, Question 2)
A) 01:51:30
B) 01:52:00
C) 01:53:10
D) 01:54:20

3.
What is the time lag (S-P) in hours:minutes:seconds GMT? (See Lab Exercise 1, Step 1, Question 3)
A) 00:02:00
B) 00:03:20
C) 00:03:30
D) 00:04:10

4.
What is the distance in kilometers between the seismic station and the epicenter? (See Lab Exercise #1, Step 2, Question 4)
A) 2400 km
B) 2600 km
C) 2800 km
D) 3000 km

5.
What is the time lag for noted at the Seattle, Washington, seismic station? (See Lab Exercise #2, Step 1)
A) 45 seconds
B) 50 seconds
C) 55 seconds
D) 65 seconds

6.
What is the distance between the Seattle seismic station and the earthquake's epicenter? (See Lab Exercise #2, Step 2)
A) 600 km
B) 700 km
C) 800 km
D) 900 km

7.
What is the time lag for noted at the Los Angeles, California, seismic station? (See Lab Exercise #2, Step 3)
A) 100 seconds
B) 120 seconds
C) 140 seconds
D) 160 seconds

8.
What is the distance between the Los Angeles seismic station and the earthquake's epicenter? (See Lab Exercise #2, Step 4)
A) 1000 km
B) 1100 km
C) 1300 km
D) 1500 km

9.
What is the time lag for noted at the Austin, Texas, seismic station? (See Lab Exercise #2, Step 5)
A) 120 seconds
B) 140 seconds
C) 165 seconds
D) 180 seconds

10.
What is the distance between the Austin seismic station and the earthquake's epicenter? (See Lab Exercise #2, Step 6)
A) 1950 km
B) 2200 km
C) 2550 km
D) 2850 km

11.
What city is nearest to the epicenter? (See Lab Exercise #2, Step 12)
A) Helena
B) Bismark
C) Boise
D) Cheyenne

12.
The focus of an earthquake is a point __________.
A) on the earth's surface where the initial release of seismic energy occurs
B) on the earth's surface where seismic waves are reflected downward
C) within the earth where seismic waves are reflected downward
D) within the earth where the initial release of seismic energy occurs

13.
The epicenter of an earthquake is a point __________.
A) on the earth's surface directly above the initial release of seismic energy
B) within the earth directly beneath the initial release of seismic energy
C) on the earth's surface where the initial release of seismic energy occurs
D) within the earth where the initial release of seismic energy occurs
E) none of the above

14.
Which of the following seismic waves has the same wave form as a sound wave?
A) surface wave
B) P wave
C) S wave
D) Love wave

15.
Which of the following seismic waves is the first to arrive at a seismic station?
A) surface wave
B) P wave
C) S wave
D) Love wave

16.
Which of the following seismic waves is the last to arrive at a seismic station?
A) Love wave
B) P wave
C) S wave
D) body wave

17.
Which seismic wave vibrates side-to-side relative to its direction of travel?
A) surface wave
B) P wave
C) S wave
D) Rayleigh wave

18.
The two kinds of body waves are __________.
A) surface waves and P waves
B) Love waves and P waves
C) P waves and S waves
D) Love waves and S waves

19.
The following seismic waves are used to locate earthquake epicenters: __________.
A) surface waves and P waves
B) Rayleigh waves and P waves
C) P waves and S waves
D) surface waves and S waves

20.
Which of the following statements is correct?
A) P-wave amplitude is larger than S-wave amplitude.
B) S-wave amplitude is larger than P-wave amplitude.
C) P-wave amplitude and S-wave amplitude are about the same.
D) P wave amplitude is larger than all the other seismic waves recorded on a seismogram.

21.
Determining the distance along the earth's surface from a seismic station to the epicenter of an earthquake is based on the difference in arrival times between __________.
A) the first P wave and the first S wave
B) the first P wave and the first Love wave
C) the first S wave and the first Love wave
D) all three seismic waves

22.
To locate the epicenter of an earthquake, it takes __________.
A) one seismic station
B) at least two seismic stations
C) at least three seismic stations
D) at least four seismic stations

23.
The two kinds of surface waves are __________.
A) Love waves and Rayleigh waves
B) Rayleigh waves and P waves
C) S waves and Love waves
D) P waves and S waves

24.
The instrument used to detect the arrival of seismic waves at a seismic stations is a(n) __________.
A) seismogram
B) epicenter
C) amplitude
D) seismograph

25.
Most earthquakes occur at __________.
A) depths of less than 40 miles
B) depths between 40 and 220 miles
C) depths deeper than 220 miles
D) divergent plate boundaries

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