Answer :
This difference increases because p-waves travel faster than s-waves. Therefore, if a seismograph is far from the epicenter, readings of the p-waves will arrive first, but since those waves travel faster than s-waves, it might be a bit longer before readings of the s-waves appear.
The difference in arrival times of P and S waves increasese at seismograph recording stations because the farther a seismic recording station is from the earthquake epicenter.
Why does the difference in arrival times of P and S waves increase at seismograph recording stations?
As the P and S waves travel out from an earthquake the P waves get progressively farther ahead of the S waves. Therefore, the farther a seismic recording station is from the earthquake epicenter the greater will be the difference in time of arrival between the P and S waves.
What happened to the difference in the arrival time between the P wave and S wave as the distance from the earthquake increases?
S waves, which travel at about half the speed of P waves, arrive later. A seismic station close to the earthquake records P waves and S waves in quick succession. With increasing distance from the earthquake the time difference between the arrival of the P waves and the arrival of the S waves increases.
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