What information is needed to determine the distance from the focus of an earthquake to the seismic receiving station?

Question

Quizplus · Accepted Answer

The time interval between the P and S waves is needed to determine the distance from the focus of an earthquake to the seismic receiving station using the distance-time graph. The velocity of the P and S waves is also needed to convert the time interval to distance. The amplitude of the seismic waves on a seismogram and the magnitude of the earthquake provide information about the intensity and energy of the earthquake but not its distance from the receiving station.

What Information Is Needed to Determine the Distance from the Focus