Locating the Epicenter of the Earthquake
____Use the graph of distance versus P-S time interval (on Table 1) to more precisely determine the location of the epicenter of the earthquake. To determine how far the earthquake was from each seismic station, use the P-S time interval for a seismic station and read off the corresponding distance from the P-S time-interval graph. Then, approximately scale off the appropriate distance from the earthquake to the seismic station and sketch part of a circle with this radius around the seismic station. The three circles intersect at the epicenter (the place on the surface directly above the earthquake). The circles may not all intersect at a single point, but may only come close to doing so. The triangles on the figure below represent the location of seismic stations.
