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Question

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1.Which seismogram(s) has(have) the greatest S-P interval? a. VNQ b. NCA c. ANE d. ANE and VNQ e. NCA and VNQ

2. At which recording station did the P-wave arrive first? a. VNQ b. NCA c. ANE d. ANE and VNQ e. NCA and VNQ

3. At which recording station did the S-wave arrive first? a. VNQ b. NCA c. ANE d. ANE and VNQ e. NCA and VNQ

4.Which seismic recording station(s) is(are) the closest to the epicenter? a. VNQ b. NCA c. ANE d. ANE and VNQ e. NCA and VNQ

5.Which seismic recording station(s) is(are) the farthest from the epicenter? a. VNQ b. NCA c. ANE d. ANE and VNQ e. NCA and VNQ

6.What is the probable epicenter of the earthquake? A. B. C. D. E.

7.Which potential epicenter is farthest from the actual epicenter of the earthquake? A. B. C. D.

8. Seismic recording stations ANE and VNQ have identical seismometers. Given the amplitude of the seismograms and their distance from the epicenter, under which recording station would you expect to find surficial deposits? a. VNQ b. ANE c. Both ANE and VNQ would be sitting on top of surficial deposits. d. Neither ANE and VNQ would be sitting on top of surficial deposits.

9. The Regional Airport is sitting on top of solid granite bedrock while the Old Farm School sits on top of saturated river sediments of the Old Muddy River, which one will probably experience stronger ground motion and shaking? a. Regional Airport b. Old Farm School

10. The Regional Airport is sitting on top of solid granite bedrock while the Old Farm School sits on top of saturated river sediments of the Old Muddy River, which one will probably experience liquefaction? a. Regional Airport b. Old Farm School

Explanation / Answer

1)d. ANE and VNQ

from the time signal gap of p wave and s wave we can see they are far apart,

2) NCA

p wave is close to the time marked.

3)NCA

since the s-p time interval is less for this station, s wave will reach first here.

4)NCA

if the distance is less, the s-p time interval will also less, as the distance from epicenter increases the s-p interval increases.

5)ANE and VNQ

s-p time interval is more in these stations

6)C

when 3 stations are consider, it is more probable to occure at C

7)D

epicenter can be at C, so D is farthest from there

8)ANE

if the seismometer is above this deposits, the wavees get amplified and that is recorded on the instrument.

9) Old Farm School

seismic waves get amplified when it pass through soft soils, so this area experience stronger ground motion.

10)Old Farm School

liquifaction occurs on areas which are saturated with water.

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