If a single disturbance at an unknown distance emits both transverse and longitudinal waves that travel with distinctly different speeds in the medium, such as in the ground during an earthquake, how can the distance to the disturbance be determined?

Solution 31E Step 1 of 3: If a single disturbance at an unknown distance emits both transverse and longitudinal waves that travel with distinctly different speeds in the medium. As it is indicated that the type of data that is used to determine distance to an earthquake, Earthquakes emits both pressure and shear waves know as P and S waves. P waves travels faster through the earth than S waves. By knowing the difference in time taken by this two waves to reach seismic station, we can calculate the distance of earthquake.