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a seismic station recorded an earthquake that was 4,000 km away. what was the travel time difference between p-wave arrival and s-wave arrival in seconds?

Sagot :

A seismic station 4,000 kilometers distant noted the earthquake. The time gap between the arrival of the P-wave and the arrival of the S-wave was 320 seconds.

Please refer to the attached picture below. The graph indicates that the P-wave will reach the seismic station in 7 minutes. P-wave extrapolation stops at a vertical time scale cutoff of 7 minutes. At 12 min. 20 sec., the S-wave will reach the seismic station.

On the vertical scale, one minute is split into three segments. Thus, each segment will last 20 seconds.

So, travel time difference = S wave arrival  -  P wave arrival

= 12 minutes 20 seconds  - 7 minutes

= 5 minutes 20 seconds

We know that 1 minute = 60 seconds

So, 5 minutes = 5 × 60

= 300 seconds

Consequently, the distance between the arrival of P wave and the arrival of S-wave = 300 seconds + 20 seconds

= 320 seconds

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