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The S-P time method is used to determine the distance to an earthquake epicenter. The first step is to measure the time difference between the arrival of the primary (P) waves and the secondary (S) waves at a seismograph station. The second step is to use a travel-time graph to determine the distance to the epicenter based on the time interval between the P and S waves. Finally, by using data from at least three seismograph stations, the exact location of the earthquake epicenter can be triangulated.

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9mo ago

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