To determine the distance of the earthquake epicenter, you can use the steps in the previous section.
1. Determine the arrival times of the P-wave and the S-wave:
Arrival time of P-wave: 1.0 min
Arrival time of S-wave: 6.0 min
2. Calculate the difference between the arrival time of the P-wave and the S-wave.
Time Difference = $6.0-1.0equals;5.0\mathrm{min}$
3. Refer to the Earthquake Time Travel Graph. Determine the location on the graph where the two curves have a time difference equal to the time difference you previously calculated.
After looking at the Earthquake Time Travel Graph, it is clear that the two curves have a difference of 5 units on the time axis at x = 3.4. Therefore the earthquake has an epicenter distance of $3.4\cdot {10}^{3}$ km, or 3,400 km.