What is the minimum number of location data points needed in order to determine the location of the epicenter of an earthquake?

To determine the location of an earthquake's epicenter, a minimum of three location data points from seismograph stations is needed. Each station measures the time it takes for seismic waves to reach it, allowing for triangulation. By calculating the distances from each station to the epicenter based on these time differences, the intersection point of the three circles drawn from the stations indicates the epicenter's location.