I would need three as a minimum number of seismometers, in order to locate the earthquake.
The P- and S-wave arrival times at various seismometers are utilized to pinpoint the earthquake's exact location. The separation of the P- and S-wave arrival times indicates how far away the earthquake is from the seismometer, providing we know the relative speeds of the P- and S-waves.
So, concludingly, in general, tracings are made at three different or separate seismic stations ( that record the ground moments and display them in digital form as digital data), which are needed to locate the earthquake center point.
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