Question

Suppose that an earthquake occurs, and the epicenter is 80 km from a recording station with a seismograph. At that recording station, how much time will pass between the arrival of the first P wave and the arrival of the first S wave? (In other words, what will ΔT be?)

Answer 1

B. about 10 seconds

Step-by-step explanation:

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Answer 2

`\Delta T = 10.2 s`

Step-by-step explanation:

As we know that speed of P wave and S wave is given as

`v_p = 5.7 km/s`

`v_s = 3.3 km/s`

Now the waves travels simultaneously towards the detector which is placed at 80 km distance

so the time is given as

`t = (d)/(v)`

so the time difference is given as

`\Delta T = (d)/(v_1) - (d)/(v_2)`

`\Delta T = (80)/(3.3) - (80)/(5.7)`

`\Delta T = 10.2 s`