Question

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An epicenter station that records seismic waves is 7,000 km
away from the earthquake epicenter. How long after the first
P-wave did the first S-wave arrive?

Answer 1

Answer:

8.7min

Explanation:

The epicenter is the origin of an earthquake wave.

Since the distance between the earthquake origin and the station is 7000km and we are told to find the time after which the s - wave arrives from that of the p- waves, we follow the procedure below:

• we use the graph of the travel time  - distance given
• trace the 7000km as the distance and find where it cuts the p-wave curve.
• the point is 10.3min
• trace it up to where 7000km intersects the s-wave curve which is at 19min

So;

  The time difference  = 19min  - 10.3min  = 8.7min

After the p-waves arrived, it took the s-waves  8.7min to reach the station.

Answer 2

Answer:

8.7min

Explanation:

The epicenter is the origin of an earthquake wave.

Since the distance between the earthquake origin and the station is 7000km and we are told to find the time after which the s - wave arrives from that of the p- waves, we follow the procedure below:

we use the graph of the travel time  - distance given

trace the 7000km as the distance and find where it cuts the p-wave curve.

the point is 10.3min

trace it up to where 7000km intersects the s-wave curve which is at 19min

So;

 The time difference  = 19min  - 10.3min  = 8.7min

After the p-waves arrived, it took the s-waves  8.7min to reach the station.

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