Question

Why is a minimum of three seismic stations needed to find the epicenter of an earthquake

Answer 1

Answer: Each seismic point shows the area of where the epicenter is, you can only reliably find the precise spot of the epicenter when you have 3 seismic points.

Explanation: wrote you a little paragraph, its correct! :)

Answer 2

Each point basically indicates a certain area in which the epicenter could be in, and only when three stations are given could it be narrowed down and the epicenter is found.