How does the time difference (A1) between the first P-wave and the first S-wave relate to the distance to the epicenter?

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 wave.

Explanation:

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the climate of each region is different from one another.