Look at the figure below. The lag time is the difference between when the P wave

Question

Look at the figure below. The lag time is the difference between when the P waves arrived and when the S waves arrived. Using the earthquake data shown in the figure below, what is the lag time? How does the lag time depend on the distance to the earthquake? Assume the wave speeds are constant. First Pwaves arrive. First S waves arrive. occurs 7440 km away 0 10 15 20 25 Time (minutes) O a. About 9 minutes. The lag time is constant for all seismic waves b. About 2 minutes. The lag time increases as the observer gets closer to the quake. Oc. About 2 minutes. The lag time decreases as the observer gets closer to the quake. O d. About 9 minutes. The lag time is proportional to the distance to the earthquake.

Explanation / Answer

Here, option d is correct.

Because

Lag time = distance of earthquake / s wave speed

That is lag time is proportional to the distance to the earthquake. When wave speed is constant.

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