Answer:

1. To find an earthquake epicenter you need at least three seismographs. Find the distance from each seismograph to the earthquake epicenter. The interception of the three circles is the epicenter.24 Feb 2012
2. Use the time difference between the arrival of the P and S waves to estimate the distance from the earthquake to the station. (From Bolt, 1978.) Measure the distance between the first P wave and the first S wave. In this case, the first P and S waves are 24 seconds apart.
3. The difficulty that I will encounter if I only have data from two recording stations is that I may be confused about finding the exact epicenter and I will not be able to triangulate the epicenter. Using data from at least three stations require from a triangulation method gives exact location of an epicenter.