Why do you need 3 seismographs to locate the epicentre of an earthquake?
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Triangulation requires that you determine the exact arrival time of the P and S waves produced by an earthquake for at least three different seismograph stations. Since P waves travel roughly twice as fast as S waves, the further the earthquake's epicenter the greater the time difference between the two arrival times.
Explanation:
To find an earthquake epicenter you need at least three seismographs. Find the distance from each seismograph to the earthquake epicenter. The interception of the three circles is the epicenter.Apr 3, 2018
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