Answer:
Triangulation.
Step-by-step explanation:
The epicenter is the point directly on the ground which is above the focus of an earthquake.
To determine the epicenter of an earthquake, seismologist use a method called triangulation.
The method of triangulation uses the distances an earthquake travels to a seismic station to pinpoint the epicenter. The distances are used as radius of a circle. Usually, three circles are drawn from the distances of the earthquake wave from the seismic stations. The point of intersection of the circles gives the epicenter of the wave.