QUESTIONS:
What is the geocentric angle of the earthquake
focus?
6.
7.
2. What is the major difference between the inner
and outer core?
3
What is meant by the note in Figure that says
The figure is not to scate?
What is the range of geocentric angles that
allows one to experience both P- and S-waves?
5. Which location. 23-degrees or 48 degrees would
experience the same earthquake at stronger
intensity? Explain why.
What happens when P-waves encounter a
boundary between mantle and the core?
Copy then fill in the following data table to
Indicate the types of selsmic waves received at
various geocentric angles.
time to reach seismograph from
earthquake focus (min)
Geocentric Angle
0-degrees
67-degrees
123-degrees
22
20
18
4208
2
0
1,000
2,000
5-wayes
3,000
P-waves
4,000
5,000
6,000
Selsmic Waves Received
7,000
8,000
9,000
distance along Earth's surface from earthquake
focus to seismograph (km)
Figure 3
Earth Layer
Crust
Mantle
Inner Core
Outer Core
9. According to Figure 2, how do the amplitudes of P- and S-waves compare?
10. According to Figure 2, how much time passes between P- and S-wave arrivals?
10,000
168 degrees
8. Copy then fill in the following data table to indicate the types of waves that can travel through each
earth layer.
Seismic Waves Can Travel
11. According to Figure 3. is the speed of P-waves constant or not? Explain.
12. According to Figure 3, is the speed of S-waves constant or not? Explain
13. According to Figure 3, how long will it take for P-wave to arrive when an earthquake is 9500 km away
from the focus?
14. According to Figure 3, how long will it take for S-wave to arrive when an earthquake is 9500 km away
from the focus?
15. According to Figure 3, what is the S-P interval for earthquake located 9500 km away?
16. Based on Figure 2, depicting P- and S-wave arrival time Use Figure 3 to determine the distance from
the focus of the earthquake in km.