A line graph that measures the seismic wave travel time. Travel time (minutes) is measured along the vertical axis, from 0 to 13 mins.

• Distance to the epicenter (km) is measured along the horizontal axis (0, 1000, 2000, 3000,4000)
• Both the S and P waves initially start at 0.
• The graph measures how fast each wave travels. The P wave travels faster than the S wave.